[3389a] Commit before regen

doc/guide/dhcp4-srv.xml

@@ -719,6 +719,23 @@ temporarily override a list of interface names and listen on all interfaces.
     supported on the particular OS, the server will issue a warning and
     fall back to use IP/UDP sockets.</para>
   </note>
+
+  <para>Interfaces are re-detected at each reconfiguration. This behavior
+  can be disabled by setting <command>re-detect</command> value to
+  <userinput>false</userinput>, for instance:
+
+  <screen>
+"Dhcp4": {
+    "interfaces-config": {
+        "interfaces": [ <userinput>"eth1", "eth3"</userinput> ],
+        "re-detect": <userinput>false</userinput>
+    },
+    ...
+}
+  </screen>
+  Note interfaces are not re-detected during <command>config-test</command>.
+  </para>
+
 </section>
 
 <section id="dhcpinform-unicast-issues">

doc/guide/dhcp6-srv.xml

@@ -625,6 +625,13 @@ for MySQL and PostgreSQL databases.</para></note>
 It is anticipated that this will form of usage only be used where it is desired to
 temporarily override a list of interface names and listen on all interfaces.
   </para>
+
+  <para>As for the DHCPv4 server binding to specific addresses and
+  disabling re-detection of interfaces are supported. But
+  <command>dhcp-socket-type</command> is not because DHCPv6 uses
+  UDP/IPv6 sockets only.
+  </para>
+
 </section>
 
     <section id="ipv6-subnet-id">

src/bin/dhcp4/json_config_parser.cc

@@ -483,9 +483,18 @@ configureDhcp4Server(Dhcpv4Srv&, isc::data::ConstElementPtr config_set,
             }
 
             if (config_pair.first == "interfaces-config") {
+                ElementPtr ifaces_cfg =
+                    boost::const_pointer_cast<Element>(config_pair.second);
+                if (check_only) {
+                    // No re-detection in check only mode
+                    ifaces_cfg->set("re-detect", Element::create(false));
+                } else if (!ifaces_cfg->contains("re-detect")) {
+                    // Else the default is to re-detect
+                    ifaces_cfg->set("re-detect", Element::create(true));
+                }
                 IfacesConfigParser parser(AF_INET);
                 CfgIfacePtr cfg_iface = srv_cfg->getCfgIface();
-                parser.parse(cfg_iface, config_pair.second);
+                parser.parse(cfg_iface, ifaces_cfg);
                 continue;
             }
 

src/bin/dhcp4/tests/ctrl_dhcp4_srv_unittest.cc

@@ -49,7 +49,9 @@ namespace {
 class NakedControlledDhcpv4Srv: public ControlledDhcpv4Srv {
     // "Naked" DHCPv4 server, exposes internal fields
 public:
-    NakedControlledDhcpv4Srv():ControlledDhcpv4Srv(0) { }
+    NakedControlledDhcpv4Srv():ControlledDhcpv4Srv(0) {
+        CfgMgr::instance().setFamily(AF_INET);
+    }
 
     /// Expose internal methods for the sake of testing
     using Dhcpv4Srv::receivePacket;

src/bin/dhcp4/tests/dhcp4_test_utils.cc

@@ -608,6 +608,9 @@ Dhcpv4SrvTest::configure(const std::string& config, NakedDhcpv4Srv& srv,
     ASSERT_NO_THROW(json = parseJSON(config));
     ConstElementPtr status;
 
+    // Patch the re-detect flag
+    patchIfacesReDetect(json);
+
     // Configure the server and make sure the config is accepted
     EXPECT_NO_THROW(status = configureDhcp4Server(srv, json));
     ASSERT_TRUE(status);

src/bin/dhcp4/tests/dhcp4_test_utils.h

@@ -479,6 +479,18 @@ public:
     NakedDhcpv4Srv srv_;
 };
 
+/// @brief Patch the server config to add interface-config/re-detect=false
+/// @param json the server config
+inline void
+patchIfacesReDetect(isc::data::ConstElementPtr json) {
+    isc::data::ConstElementPtr ifaces_cfg = json->get("interfaces-config");
+    if (ifaces_cfg) {
+        isc::data::ElementPtr mutable_cfg =
+            boost::const_pointer_cast<isc::data::Element>(ifaces_cfg);
+        mutable_cfg->set("re-detect", isc::data::Element::create(false));
+    }
+}
+
 /// @brief Runs parser in JSON mode, useful for parser testing
 ///
 /// @param in string to be parsed
@@ -503,7 +515,10 @@ parseDHCP4(const std::string& in, bool verbose = false)
 {
     try {
         isc::dhcp::Parser4Context ctx;
-        return (ctx.parseString(in, isc::dhcp::Parser4Context::SUBPARSER_DHCP4));
+        isc::data::ElementPtr json;
+        json = ctx.parseString(in, isc::dhcp::Parser4Context::SUBPARSER_DHCP4);
+        patchIfacesReDetect(json);
+        return (json);
     }
     catch (const std::exception& ex) {
         if (verbose) {

src/bin/dhcp4/tests/get_config_unittest.cc

@@ -1517,7 +1517,8 @@ const char* UNPARSED_CONFIGS[] = {
 "        \"hooks-libraries\": [ ],\n"
 "        \"host-reservation-identifiers\": [ \"hw-address\", \"duid\", \"circuit-id\" ],\n"
 "        \"interfaces-config\": {\n"
-"            \"interfaces\": [ \"*\" ]\n"
+"            \"interfaces\": [ \"*\" ],\n"
+"            \"re-detect\": false\n"
 "        },\n"
 "        \"lease-database\": {\n"
 "            \"type\": \"memfile\"\n"
@@ -1558,7 +1559,8 @@ const char* UNPARSED_CONFIGS[] = {
 "        \"hooks-libraries\": [ ],\n"
 "        \"host-reservation-identifiers\": [ \"hw-address\", \"duid\", \"circuit-id\" ],\n"
 "        \"interfaces-config\": {\n"
-"            \"interfaces\": [ \"*\" ]\n"
+"            \"interfaces\": [ \"*\" ],\n"
+"            \"re-detect\": false\n"
 "        },\n"
 "        \"lease-database\": {\n"
 "            \"type\": \"memfile\"\n"
@@ -1624,7 +1626,8 @@ const char* UNPARSED_CONFIGS[] = {
 "        \"hooks-libraries\": [ ],\n"
 "        \"host-reservation-identifiers\": [ \"hw-address\", \"duid\", \"circuit-id\" ],\n"
 "        \"interfaces-config\": {\n"
-"            \"interfaces\": [ \"*\" ]\n"
+"            \"interfaces\": [ \"*\" ],\n"
+"            \"re-detect\": false\n"
 "        },\n"
 "        \"lease-database\": {\n"
 "            \"type\": \"memfile\"\n"
@@ -1690,7 +1693,8 @@ const char* UNPARSED_CONFIGS[] = {
 "        \"hooks-libraries\": [ ],\n"
 "        \"host-reservation-identifiers\": [ \"hw-address\", \"duid\", \"circuit-id\" ],\n"
 "        \"interfaces-config\": {\n"
-"            \"interfaces\": [ \"*\" ]\n"
+"            \"interfaces\": [ \"*\" ],\n"
+"            \"re-detect\": false\n"
 "        },\n"
 "        \"lease-database\": {\n"
 "            \"type\": \"memfile\"\n"
@@ -1756,7 +1760,8 @@ const char* UNPARSED_CONFIGS[] = {
 "        \"hooks-libraries\": [ ],\n"
 "        \"host-reservation-identifiers\": [ \"hw-address\", \"duid\", \"circuit-id\" ],\n"
 "        \"interfaces-config\": {\n"
-"            \"interfaces\": [ \"*\" ]\n"
+"            \"interfaces\": [ \"*\" ],\n"
+"            \"re-detect\": false\n"
 "        },\n"
 "        \"lease-database\": {\n"
 "            \"type\": \"memfile\"\n"
@@ -1894,7 +1899,8 @@ const char* UNPARSED_CONFIGS[] = {
 "        \"hooks-libraries\": [ ],\n"
 "        \"host-reservation-identifiers\": [ \"hw-address\", \"duid\", \"circuit-id\" ],\n"
 "        \"interfaces-config\": {\n"
-"            \"interfaces\": [ \"*\" ]\n"
+"            \"interfaces\": [ \"*\" ],\n"
+"            \"re-detect\": false\n"
 "        },\n"
 "        \"lease-database\": {\n"
 "            \"type\": \"memfile\"\n"
@@ -2032,7 +2038,8 @@ const char* UNPARSED_CONFIGS[] = {
 "        \"hooks-libraries\": [ ],\n"
 "        \"host-reservation-identifiers\": [ \"hw-address\", \"duid\", \"circuit-id\" ],\n"
 "        \"interfaces-config\": {\n"
-"            \"interfaces\": [ \"*\" ]\n"
+"            \"interfaces\": [ \"*\" ],\n"
+"            \"re-detect\": false\n"
 "        },\n"
 "        \"lease-database\": {\n"
 "            \"type\": \"memfile\"\n"
@@ -2098,7 +2105,8 @@ const char* UNPARSED_CONFIGS[] = {
 "        \"hooks-libraries\": [ ],\n"
 "        \"host-reservation-identifiers\": [ \"hw-address\", \"duid\", \"circuit-id\" ],\n"
 "        \"interfaces-config\": {\n"
-"            \"interfaces\": [ \"*\" ]\n"
+"            \"interfaces\": [ \"*\" ],\n"
+"            \"re-detect\": false\n"
 "        },\n"
 "        \"lease-database\": {\n"
 "            \"type\": \"memfile\"\n"
@@ -2164,7 +2172,8 @@ const char* UNPARSED_CONFIGS[] = {
 "        \"hooks-libraries\": [ ],\n"
 "        \"host-reservation-identifiers\": [ \"hw-address\", \"duid\", \"circuit-id\" ],\n"
 "        \"interfaces-config\": {\n"
-"            \"interfaces\": [ \"*\" ]\n"
+"            \"interfaces\": [ \"*\" ],\n"
+"            \"re-detect\": false\n"
 "        },\n"
 "        \"lease-database\": {\n"
 "            \"type\": \"memfile\"\n"
@@ -2230,7 +2239,8 @@ const char* UNPARSED_CONFIGS[] = {
 "        \"hooks-libraries\": [ ],\n"
 "        \"host-reservation-identifiers\": [ \"hw-address\", \"duid\", \"circuit-id\" ],\n"
 "        \"interfaces-config\": {\n"
-"            \"interfaces\": [ \"*\" ]\n"
+"            \"interfaces\": [ \"*\" ],\n"
+"            \"re-detect\": false\n"
 "        },\n"
 "        \"lease-database\": {\n"
 "            \"type\": \"memfile\"\n"
@@ -2296,7 +2306,8 @@ const char* UNPARSED_CONFIGS[] = {
 "        \"hooks-libraries\": [ ],\n"
 "        \"host-reservation-identifiers\": [ \"hw-address\", \"duid\", \"circuit-id\" ],\n"
 "        \"interfaces-config\": {\n"
-"            \"interfaces\": [ \"*\" ]\n"
+"            \"interfaces\": [ \"*\" ],\n"
+"            \"re-detect\": false\n"
 "        },\n"
 "        \"lease-database\": {\n"
 "            \"type\": \"memfile\"\n"
@@ -2362,7 +2373,8 @@ const char* UNPARSED_CONFIGS[] = {
 "        \"hooks-libraries\": [ ],\n"
 "        \"host-reservation-identifiers\": [ \"hw-address\", \"duid\", \"circuit-id\" ],\n"
 "        \"interfaces-config\": {\n"
-"            \"interfaces\": [ \"*\" ]\n"
+"            \"interfaces\": [ \"*\" ],\n"
+"            \"re-detect\": false\n"
 "        },\n"
 "        \"lease-database\": {\n"
 "            \"type\": \"memfile\"\n"
@@ -2452,7 +2464,8 @@ const char* UNPARSED_CONFIGS[] = {
 "        \"hooks-libraries\": [ ],\n"
 "        \"host-reservation-identifiers\": [ \"hw-address\", \"duid\", \"circuit-id\" ],\n"
 "        \"interfaces-config\": {\n"
-"            \"interfaces\": [ \"*\" ]\n"
+"            \"interfaces\": [ \"*\" ],\n"
+"            \"re-detect\": false\n"
 "        },\n"
 "        \"lease-database\": {\n"
 "            \"type\": \"memfile\"\n"
@@ -2542,7 +2555,8 @@ const char* UNPARSED_CONFIGS[] = {
 "        \"hooks-libraries\": [ ],\n"
 "        \"host-reservation-identifiers\": [ \"hw-address\", \"duid\", \"circuit-id\" ],\n"
 "        \"interfaces-config\": {\n"
-"            \"interfaces\": [ \"*\" ]\n"
+"            \"interfaces\": [ \"*\" ],\n"
+"            \"re-detect\": false\n"
 "        },\n"
 "        \"lease-database\": {\n"
 "            \"type\": \"memfile\"\n"
@@ -2608,7 +2622,8 @@ const char* UNPARSED_CONFIGS[] = {
 "        \"hooks-libraries\": [ ],\n"
 "        \"host-reservation-identifiers\": [ \"hw-address\", \"duid\", \"circuit-id\" ],\n"
 "        \"interfaces-config\": {\n"
-"            \"interfaces\": [ \"*\" ]\n"
+"            \"interfaces\": [ \"*\" ],\n"
+"            \"re-detect\": false\n"
 "        },\n"
 "        \"lease-database\": {\n"
 "            \"type\": \"memfile\"\n"
@@ -2704,7 +2719,8 @@ const char* UNPARSED_CONFIGS[] = {
 "        \"hooks-libraries\": [ ],\n"
 "        \"host-reservation-identifiers\": [ \"hw-address\", \"duid\", \"circuit-id\" ],\n"
 "        \"interfaces-config\": {\n"
-"            \"interfaces\": [ \"*\" ]\n"
+"            \"interfaces\": [ \"*\" ],\n"
+"            \"re-detect\": false\n"
 "        },\n"
 "        \"lease-database\": {\n"
 "            \"type\": \"memfile\"\n"
@@ -2770,7 +2786,8 @@ const char* UNPARSED_CONFIGS[] = {
 "        \"hooks-libraries\": [ ],\n"
 "        \"host-reservation-identifiers\": [ \"hw-address\", \"duid\", \"circuit-id\" ],\n"
 "        \"interfaces-config\": {\n"
-"            \"interfaces\": [ ]\n"
+"            \"interfaces\": [ ],\n"
+"            \"re-detect\": false\n"
 "        },\n"
 "        \"lease-database\": {\n"
 "            \"type\": \"memfile\"\n"
@@ -2821,7 +2838,8 @@ const char* UNPARSED_CONFIGS[] = {
 "        \"hooks-libraries\": [ ],\n"
 "        \"host-reservation-identifiers\": [ \"hw-address\", \"duid\", \"circuit-id\" ],\n"
 "        \"interfaces-config\": {\n"
-"            \"interfaces\": [ ]\n"
+"            \"interfaces\": [ ],\n"
+"            \"re-detect\": false\n"
 "        },\n"
 "        \"lease-database\": {\n"
 "            \"type\": \"memfile\"\n"
@@ -2872,7 +2890,8 @@ const char* UNPARSED_CONFIGS[] = {
 "        \"hooks-libraries\": [ ],\n"
 "        \"host-reservation-identifiers\": [ \"hw-address\", \"duid\", \"circuit-id\" ],\n"
 "        \"interfaces-config\": {\n"
-"            \"interfaces\": [ ]\n"
+"            \"interfaces\": [ ],\n"
+"            \"re-detect\": false\n"
 "        },\n"
 "        \"lease-database\": {\n"
 "            \"type\": \"memfile\"\n"
@@ -2932,7 +2951,8 @@ const char* UNPARSED_CONFIGS[] = {
 "        \"hooks-libraries\": [ ],\n"
 "        \"host-reservation-identifiers\": [ \"hw-address\", \"duid\", \"circuit-id\" ],\n"
 "        \"interfaces-config\": {\n"
-"            \"interfaces\": [ ]\n"
+"            \"interfaces\": [ ],\n"
+"            \"re-detect\": false\n"
 "        },\n"
 "        \"lease-database\": {\n"
 "            \"type\": \"memfile\"\n"
@@ -2983,7 +3003,8 @@ const char* UNPARSED_CONFIGS[] = {
 "        \"hooks-libraries\": [ ],\n"
 "        \"host-reservation-identifiers\": [ \"hw-address\", \"duid\", \"circuit-id\" ],\n"
 "        \"interfaces-config\": {\n"
-"            \"interfaces\": [ ]\n"
+"            \"interfaces\": [ ],\n"
+"            \"re-detect\": false\n"
 "        },\n"
 "        \"lease-database\": {\n"
 "            \"type\": \"memfile\"\n"
@@ -3034,7 +3055,8 @@ const char* UNPARSED_CONFIGS[] = {
 "        \"hooks-libraries\": [ ],\n"
 "        \"host-reservation-identifiers\": [ \"hw-address\", \"duid\", \"circuit-id\" ],\n"
 "        \"interfaces-config\": {\n"
-"            \"interfaces\": [ ]\n"
+"            \"interfaces\": [ ],\n"
+"            \"re-detect\": false\n"
 "        },\n"
 "        \"lease-database\": {\n"
 "            \"type\": \"memfile\"\n"
@@ -3085,7 +3107,8 @@ const char* UNPARSED_CONFIGS[] = {
 "        \"hooks-libraries\": [ ],\n"
 "        \"host-reservation-identifiers\": [ \"hw-address\", \"duid\", \"circuit-id\" ],\n"
 "        \"interfaces-config\": {\n"
-"            \"interfaces\": [ ]\n"
+"            \"interfaces\": [ ],\n"
+"            \"re-detect\": false\n"
 "        },\n"
 "        \"lease-database\": {\n"
 "            \"type\": \"memfile\"\n"
@@ -3136,7 +3159,8 @@ const char* UNPARSED_CONFIGS[] = {
 "        \"hooks-libraries\": [ ],\n"
 "        \"host-reservation-identifiers\": [ \"hw-address\", \"duid\", \"circuit-id\" ],\n"
 "        \"interfaces-config\": {\n"
-"            \"interfaces\": [ \"*\" ]\n"
+"            \"interfaces\": [ \"*\" ],\n"
+"            \"re-detect\": false\n"
 "        },\n"
 "        \"lease-database\": {\n"
 "            \"type\": \"memfile\"\n"
@@ -3217,7 +3241,8 @@ const char* UNPARSED_CONFIGS[] = {
 "        \"hooks-libraries\": [ ],\n"
 "        \"host-reservation-identifiers\": [ \"hw-address\", \"duid\", \"circuit-id\" ],\n"
 "        \"interfaces-config\": {\n"
-"            \"interfaces\": [ \"*\" ]\n"
+"            \"interfaces\": [ \"*\" ],\n"
+"            \"re-detect\": false\n"
 "        },\n"
 "        \"lease-database\": {\n"
 "            \"type\": \"memfile\"\n"
@@ -3298,7 +3323,8 @@ const char* UNPARSED_CONFIGS[] = {
 "        \"hooks-libraries\": [ ],\n"
 "        \"host-reservation-identifiers\": [ \"hw-address\", \"duid\", \"circuit-id\" ],\n"
 "        \"interfaces-config\": {\n"
-"            \"interfaces\": [ \"*\" ]\n"
+"            \"interfaces\": [ \"*\" ],\n"
+"            \"re-detect\": false\n"
 "        },\n"
 "        \"lease-database\": {\n"
 "            \"type\": \"memfile\"\n"
@@ -3389,7 +3415,8 @@ const char* UNPARSED_CONFIGS[] = {
 "        \"hooks-libraries\": [ ],\n"
 "        \"host-reservation-identifiers\": [ \"hw-address\", \"duid\", \"circuit-id\" ],\n"
 "        \"interfaces-config\": {\n"
-"            \"interfaces\": [ \"*\" ]\n"
+"            \"interfaces\": [ \"*\" ],\n"
+"            \"re-detect\": false\n"
 "        },\n"
 "        \"lease-database\": {\n"
 "            \"type\": \"memfile\"\n"
@@ -3464,7 +3491,8 @@ const char* UNPARSED_CONFIGS[] = {
 "        \"hooks-libraries\": [ ],\n"
 "        \"host-reservation-identifiers\": [ \"hw-address\", \"duid\", \"circuit-id\" ],\n"
 "        \"interfaces-config\": {\n"
-"            \"interfaces\": [ \"*\" ]\n"
+"            \"interfaces\": [ \"*\" ],\n"
+"            \"re-detect\": false\n"
 "        },\n"
 "        \"lease-database\": {\n"
 "            \"type\": \"memfile\"\n"
@@ -3580,7 +3608,8 @@ const char* UNPARSED_CONFIGS[] = {
 "        \"hooks-libraries\": [ ],\n"
 "        \"host-reservation-identifiers\": [ \"hw-address\", \"duid\", \"circuit-id\" ],\n"
 "        \"interfaces-config\": {\n"
-"            \"interfaces\": [ \"*\" ]\n"
+"            \"interfaces\": [ \"*\" ],\n"
+"            \"re-detect\": false\n"
 "        },\n"
 "        \"lease-database\": {\n"
 "            \"type\": \"memfile\"\n"
@@ -3669,7 +3698,8 @@ const char* UNPARSED_CONFIGS[] = {
 "        \"hooks-libraries\": [ ],\n"
 "        \"host-reservation-identifiers\": [ \"hw-address\", \"duid\", \"circuit-id\" ],\n"
 "        \"interfaces-config\": {\n"
-"            \"interfaces\": [ \"*\" ]\n"
+"            \"interfaces\": [ \"*\" ],\n"
+"            \"re-detect\": false\n"
 "        },\n"
 "        \"lease-database\": {\n"
 "            \"type\": \"memfile\"\n"
@@ -3775,7 +3805,8 @@ const char* UNPARSED_CONFIGS[] = {
 "        \"hooks-libraries\": [ ],\n"
 "        \"host-reservation-identifiers\": [ \"hw-address\", \"duid\", \"circuit-id\" ],\n"
 "        \"interfaces-config\": {\n"
-"            \"interfaces\": [ \"*\" ]\n"
+"            \"interfaces\": [ \"*\" ],\n"
+"            \"re-detect\": false\n"
 "        },\n"
 "        \"lease-database\": {\n"
 "            \"type\": \"memfile\"\n"
@@ -3850,7 +3881,8 @@ const char* UNPARSED_CONFIGS[] = {
 "        \"hooks-libraries\": [ ],\n"
 "        \"host-reservation-identifiers\": [ \"hw-address\", \"duid\", \"circuit-id\" ],\n"
 "        \"interfaces-config\": {\n"
-"            \"interfaces\": [ \"*\" ]\n"
+"            \"interfaces\": [ \"*\" ],\n"
+"            \"re-detect\": false\n"
 "        },\n"
 "        \"lease-database\": {\n"
 "            \"type\": \"memfile\"\n"
@@ -3957,7 +3989,8 @@ const char* UNPARSED_CONFIGS[] = {
 "        \"hooks-libraries\": [ ],\n"
 "        \"host-reservation-identifiers\": [ \"hw-address\", \"duid\", \"circuit-id\" ],\n"
 "        \"interfaces-config\": {\n"
-"            \"interfaces\": [ \"*\" ]\n"
+"            \"interfaces\": [ \"*\" ],\n"
+"            \"re-detect\": false\n"
 "        },\n"
 "        \"lease-database\": {\n"
 "            \"type\": \"memfile\"\n"
@@ -4036,7 +4069,8 @@ const char* UNPARSED_CONFIGS[] = {
 "        \"hooks-libraries\": [ ],\n"
 "        \"host-reservation-identifiers\": [ \"hw-address\", \"duid\", \"circuit-id\" ],\n"
 "        \"interfaces-config\": {\n"
-"            \"interfaces\": [ \"*\" ]\n"
+"            \"interfaces\": [ \"*\" ],\n"
+"            \"re-detect\": false\n"
 "        },\n"
 "        \"lease-database\": {\n"
 "            \"type\": \"memfile\"\n"
@@ -4120,7 +4154,8 @@ const char* UNPARSED_CONFIGS[] = {
 "        \"hooks-libraries\": [ ],\n"
 "        \"host-reservation-identifiers\": [ \"hw-address\", \"duid\", \"circuit-id\" ],\n"
 "        \"interfaces-config\": {\n"
-"            \"interfaces\": [ \"eth0\", \"eth1\" ]\n"
+"            \"interfaces\": [ \"eth0\", \"eth1\" ],\n"
+"            \"re-detect\": false\n"
 "        },\n"
 "        \"lease-database\": {\n"
 "            \"type\": \"memfile\"\n"
@@ -4161,7 +4196,8 @@ const char* UNPARSED_CONFIGS[] = {
 "        \"hooks-libraries\": [ ],\n"
 "        \"host-reservation-identifiers\": [ \"hw-address\", \"duid\", \"circuit-id\" ],\n"
 "        \"interfaces-config\": {\n"
-"            \"interfaces\": [ \"*\", \"eth0\", \"eth1\" ]\n"
+"            \"interfaces\": [ \"*\", \"eth0\", \"eth1\" ],\n"
+"            \"re-detect\": false\n"
 "        },\n"
 "        \"lease-database\": {\n"
 "            \"type\": \"memfile\"\n"
@@ -4202,7 +4238,8 @@ const char* UNPARSED_CONFIGS[] = {
 "        \"hooks-libraries\": [ ],\n"
 "        \"host-reservation-identifiers\": [ \"hw-address\", \"duid\", \"circuit-id\" ],\n"
 "        \"interfaces-config\": {\n"
-"            \"interfaces\": [ \"*\" ]\n"
+"            \"interfaces\": [ \"*\" ],\n"
+"            \"re-detect\": false\n"
 "        },\n"
 "        \"lease-database\": {\n"
 "            \"type\": \"memfile\"\n"
@@ -4268,7 +4305,8 @@ const char* UNPARSED_CONFIGS[] = {
 "        \"hooks-libraries\": [ ],\n"
 "        \"host-reservation-identifiers\": [ \"hw-address\", \"duid\", \"circuit-id\" ],\n"
 "        \"interfaces-config\": {\n"
-"            \"interfaces\": [ \"*\" ]\n"
+"            \"interfaces\": [ \"*\" ],\n"
+"            \"re-detect\": false\n"
 "        },\n"
 "        \"lease-database\": {\n"
 "            \"type\": \"memfile\"\n"
@@ -4334,7 +4372,8 @@ const char* UNPARSED_CONFIGS[] = {
 "        \"hooks-libraries\": [ ],\n"
 "        \"host-reservation-identifiers\": [ \"hw-address\", \"duid\", \"circuit-id\" ],\n"
 "        \"interfaces-config\": {\n"
-"            \"interfaces\": [ \"*\" ]\n"
+"            \"interfaces\": [ \"*\" ],\n"
+"            \"re-detect\": false\n"
 "        },\n"
 "        \"lease-database\": {\n"
 "            \"type\": \"memfile\"\n"
@@ -4545,7 +4584,8 @@ const char* UNPARSED_CONFIGS[] = {
 "        \"hooks-libraries\": [ ],\n"
 "        \"host-reservation-identifiers\": [ \"hw-address\", \"duid\", \"circuit-id\" ],\n"
 "        \"interfaces-config\": {\n"
-"            \"interfaces\": [ \"*\" ]\n"
+"            \"interfaces\": [ \"*\" ],\n"
+"            \"re-detect\": false\n"
 "        },\n"
 "        \"lease-database\": {\n"
 "            \"type\": \"memfile\"\n"
@@ -4640,7 +4680,8 @@ const char* UNPARSED_CONFIGS[] = {
 "        \"hooks-libraries\": [ ],\n"
 "        \"host-reservation-identifiers\": [ \"hw-address\", \"duid\", \"circuit-id\" ],\n"
 "        \"interfaces-config\": {\n"
-"            \"interfaces\": [ ]\n"
+"            \"interfaces\": [ ],\n"
+"            \"re-detect\": false\n"
 "        },\n"
 "        \"lease-database\": {\n"
 "            \"type\": \"memfile\"\n"
@@ -4778,7 +4819,8 @@ const char* UNPARSED_CONFIGS[] = {
 "        \"hooks-libraries\": [ ],\n"
 "        \"host-reservation-identifiers\": [ \"hw-address\", \"duid\", \"circuit-id\" ],\n"
 "        \"interfaces-config\": {\n"
-"            \"interfaces\": [ \"*\" ]\n"
+"            \"interfaces\": [ \"*\" ],\n"
+"            \"re-detect\": false\n"
 "        },\n"
 "        \"lease-database\": {\n"
 "            \"type\": \"memfile\"\n"
@@ -4819,7 +4861,8 @@ const char* UNPARSED_CONFIGS[] = {
 "        \"hooks-libraries\": [ ],\n"
 "        \"host-reservation-identifiers\": [ \"hw-address\", \"duid\", \"circuit-id\" ],\n"
 "        \"interfaces-config\": {\n"
-"            \"interfaces\": [ \"*\" ]\n"
+"            \"interfaces\": [ \"*\" ],\n"
+"            \"re-detect\": false\n"
 "        },\n"
 "        \"lease-database\": {\n"
 "            \"type\": \"memfile\"\n"
@@ -4860,7 +4903,8 @@ const char* UNPARSED_CONFIGS[] = {
 "        \"hooks-libraries\": [ ],\n"
 "        \"host-reservation-identifiers\": [ \"hw-address\", \"duid\", \"circuit-id\" ],\n"
 "        \"interfaces-config\": {\n"
-"            \"interfaces\": [ \"*\" ]\n"
+"            \"interfaces\": [ \"*\" ],\n"
+"            \"re-detect\": false\n"
 "        },\n"
 "        \"lease-database\": {\n"
 "            \"type\": \"memfile\"\n"
@@ -4901,7 +4945,8 @@ const char* UNPARSED_CONFIGS[] = {
 "        \"hooks-libraries\": [ ],\n"
 "        \"host-reservation-identifiers\": [ \"hw-address\", \"duid\", \"circuit-id\" ],\n"
 "        \"interfaces-config\": {\n"
-"            \"interfaces\": [ \"*\" ]\n"
+"            \"interfaces\": [ \"*\" ],\n"
+"            \"re-detect\": false\n"
 "        },\n"
 "        \"lease-database\": {\n"
 "            \"type\": \"memfile\"\n"
@@ -4942,7 +4987,8 @@ const char* UNPARSED_CONFIGS[] = {
 "        \"hooks-libraries\": [ ],\n"
 "        \"host-reservation-identifiers\": [ \"hw-address\", \"duid\", \"circuit-id\" ],\n"
 "        \"interfaces-config\": {\n"
-"            \"interfaces\": [ \"*\" ]\n"
+"            \"interfaces\": [ \"*\" ],\n"
+"            \"re-detect\": false\n"
 "        },\n"
 "        \"lease-database\": {\n"
 "            \"type\": \"memfile\"\n"
@@ -5008,7 +5054,8 @@ const char* UNPARSED_CONFIGS[] = {
 "        \"hooks-libraries\": [ ],\n"
 "        \"host-reservation-identifiers\": [ \"hw-address\", \"duid\", \"circuit-id\" ],\n"
 "        \"interfaces-config\": {\n"
-"            \"interfaces\": [ \"*\" ]\n"
+"            \"interfaces\": [ \"*\" ],\n"
+"            \"re-detect\": false\n"
 "        },\n"
 "        \"lease-database\": {\n"
 "            \"type\": \"memfile\"\n"
@@ -5074,7 +5121,8 @@ const char* UNPARSED_CONFIGS[] = {
 "        \"hooks-libraries\": [ ],\n"
 "        \"host-reservation-identifiers\": [ \"hw-address\", \"duid\", \"circuit-id\" ],\n"
 "        \"interfaces-config\": {\n"
-"            \"interfaces\": [ \"*\" ]\n"
+"            \"interfaces\": [ \"*\" ],\n"
+"            \"re-detect\": false\n"
 "        },\n"
 "        \"lease-database\": {\n"
 "            \"type\": \"memfile\"\n"
@@ -5140,7 +5188,8 @@ const char* UNPARSED_CONFIGS[] = {
 "        \"hooks-libraries\": [ ],\n"
 "        \"host-reservation-identifiers\": [ \"hw-address\", \"duid\", \"circuit-id\" ],\n"
 "        \"interfaces-config\": {\n"
-"            \"interfaces\": [ \"*\" ]\n"
+"            \"interfaces\": [ \"*\" ],\n"
+"            \"re-detect\": false\n"
 "        },\n"
 "        \"lease-database\": {\n"
 "            \"type\": \"memfile\"\n"
@@ -5206,7 +5255,8 @@ const char* UNPARSED_CONFIGS[] = {
 "        \"hooks-libraries\": [ ],\n"
 "        \"host-reservation-identifiers\": [ \"hw-address\", \"duid\", \"circuit-id\" ],\n"
 "        \"interfaces-config\": {\n"
-"            \"interfaces\": [ \"*\" ]\n"
+"            \"interfaces\": [ \"*\" ],\n"
+"            \"re-detect\": false\n"
 "        },\n"
 "        \"lease-database\": {\n"
 "            \"type\": \"memfile\"\n"
@@ -5295,7 +5345,8 @@ const char* UNPARSED_CONFIGS[] = {
 "        \"hooks-libraries\": [ ],\n"
 "        \"host-reservation-identifiers\": [ \"hw-address\", \"duid\", \"circuit-id\" ],\n"
 "        \"interfaces-config\": {\n"
-"            \"interfaces\": [ \"*\" ]\n"
+"            \"interfaces\": [ \"*\" ],\n"
+"            \"re-detect\": false\n"
 "        },\n"
 "        \"lease-database\": {\n"
 "            \"type\": \"memfile\"\n"
@@ -5361,7 +5412,8 @@ const char* UNPARSED_CONFIGS[] = {
 "        \"hooks-libraries\": [ ],\n"
 "        \"host-reservation-identifiers\": [ \"hw-address\", \"duid\", \"circuit-id\" ],\n"
 "        \"interfaces-config\": {\n"
-"            \"interfaces\": [ \"*\" ]\n"
+"            \"interfaces\": [ \"*\" ],\n"
+"            \"re-detect\": false\n"
 "        },\n"
 "        \"lease-database\": {\n"
 "            \"type\": \"memfile\"\n"
@@ -5427,7 +5479,8 @@ const char* UNPARSED_CONFIGS[] = {
 "        \"hooks-libraries\": [ ],\n"
 "        \"host-reservation-identifiers\": [ \"hw-address\", \"duid\", \"circuit-id\" ],\n"
 "        \"interfaces-config\": {\n"
-"            \"interfaces\": [ \"*\" ]\n"
+"            \"interfaces\": [ \"*\" ],\n"
+"            \"re-detect\": false\n"
 "        },\n"
 "        \"lease-database\": {\n"
 "            \"type\": \"memfile\"\n"
@@ -5494,7 +5547,8 @@ const char* UNPARSED_CONFIGS[] = {
 "        \"hooks-libraries\": [ ],\n"
 "        \"host-reservation-identifiers\": [ \"hw-address\", \"duid\", \"circuit-id\" ],\n"
 "        \"interfaces-config\": {\n"
-"            \"interfaces\": [ \"*\" ]\n"
+"            \"interfaces\": [ \"*\" ],\n"
+"            \"re-detect\": false\n"
 "        },\n"
 "        \"lease-database\": {\n"
 "            \"type\": \"memfile\"\n"
@@ -5565,7 +5619,8 @@ const char* UNPARSED_CONFIGS[] = {
 "        \"hooks-libraries\": [ ],\n"
 "        \"host-reservation-identifiers\": [ \"hw-address\", \"duid\", \"circuit-id\" ],\n"
 "        \"interfaces-config\": {\n"
-"            \"interfaces\": [ \"*\" ]\n"
+"            \"interfaces\": [ \"*\" ],\n"
+"            \"re-detect\": false\n"
 "        },\n"
 "        \"lease-database\": {\n"
 "            \"type\": \"memfile\"\n"
@@ -5873,6 +5928,6 @@ TEST_P(Dhcp4GetConfigTest, run) {
 
 /// Define the parametrized test loop
 INSTANTIATE_TEST_CASE_P(Dhcp4GetConfigTest, Dhcp4GetConfigTest,
-                        ::testing::Range(static_cast<size_t>(0), max_config_counter));
+                        ::testing::Range(0UL, max_config_counter));
 
 };

src/bin/dhcp6/json_config_parser.cc

@@ -694,9 +694,18 @@ configureDhcp6Server(Dhcpv6Srv&, isc::data::ConstElementPtr config_set,
             }
 
             if (config_pair.first == "interfaces-config") {
+                ElementPtr ifaces_cfg =
+                    boost::const_pointer_cast<Element>(config_pair.second);
+                if (check_only) {
+                    // No re-detection in check only mode
+                    ifaces_cfg->set("re-detect", Element::create(false));
+                } else if (!ifaces_cfg->contains("re-detect")) {
+                    // Else the default is to re-detect
+                    ifaces_cfg->set("re-detect", Element::create(true));
+                }
                 IfacesConfigParser parser(AF_INET6);
                 CfgIfacePtr cfg_iface = srv_config->getCfgIface();
-                parser.parse(cfg_iface, config_pair.second);
+                parser.parse(cfg_iface, ifaces_cfg);
                 continue;
             }
 

src/bin/dhcp6/tests/ctrl_dhcp6_srv_unittest.cc

@@ -49,6 +49,7 @@ class NakedControlledDhcpv6Srv: public ControlledDhcpv6Srv {
     // "Naked" DHCPv6 server, exposes internal fields
 public:
     NakedControlledDhcpv6Srv():ControlledDhcpv6Srv(DHCP6_SERVER_PORT + 10000) {
+        CfgMgr::instance().setFamily(AF_INET6);
     }
 
     /// Expose internal methods for the sake of testing
@@ -576,7 +577,7 @@ TEST_F(CtrlChannelDhcpv6SrvTest, set_config) {
 
 typedef std::map<std::string, isc::data::ConstElementPtr> ElementMap;
 
-// This test checks which commands are registered by the DHCPv4 server.
+// This test checks which commands are registered by the DHCPv6 server.
 TEST_F(CtrlDhcpv6SrvTest, commandsRegistration) {
 
     ConstElementPtr list_cmds = createCommand("list-commands");

src/bin/dhcp6/tests/dhcp6_test_utils.cc

@@ -702,6 +702,9 @@ Dhcpv6SrvTest::configure(const std::string& config, NakedDhcpv6Srv& srv) {
     ASSERT_NO_THROW(json = parseJSON(config));
     ConstElementPtr status;
 
+    // Patch the re-detect flag
+    patchIfacesReDetect(json);
+
     // Configure the server and make sure the config is accepted
     EXPECT_NO_THROW(status = configureDhcp6Server(srv, json));
     ASSERT_TRUE(status);

src/bin/dhcp6/tests/dhcp6_test_utils.h

@@ -639,6 +639,18 @@ public:
     NakedDhcpv6Srv srv_;
 };
 
+/// @brief Patch the server config to add interface-config/re-detect=false
+/// @param json the server config
+inline void
+patchIfacesReDetect(isc::data::ConstElementPtr json) {
+    isc::data::ConstElementPtr ifaces_cfg = json->get("interfaces-config");
+    if (ifaces_cfg) {
+        isc::data::ElementPtr mutable_cfg =
+            boost::const_pointer_cast<isc::data::Element>(ifaces_cfg);
+        mutable_cfg->set("re-detect", isc::data::Element::create(false));
+    }
+}
+
 /// @brief Runs parser in JSON mode, useful for parser testing
 ///
 /// @param in string to be parsed
@@ -663,7 +675,10 @@ parseDHCP6(const std::string& in, bool verbose = false)
 {
     try {
         isc::dhcp::Parser6Context ctx;
-        return (ctx.parseString(in, isc::dhcp::Parser6Context::SUBPARSER_DHCP6));
+        isc::data::ElementPtr json;
+        json = ctx.parseString(in, isc::dhcp::Parser6Context::SUBPARSER_DHCP6);
+        patchIfacesReDetect(json);
+        return (json);
     }
     catch (const std::exception& ex) {
         if (verbose) {

src/bin/dhcp6/tests/get_config_unittest.cc

@@ -1495,7 +1495,8 @@ const char* UNPARSED_CONFIGS[] = {
 "        \"hooks-libraries\": [ ],\n"
 "        \"host-reservation-identifiers\": [ \"hw-address\", \"duid\" ],\n"
 "        \"interfaces-config\": {\n"
-"            \"interfaces\": [ \"*\" ]\n"
+"            \"interfaces\": [ \"*\" ],\n"
+"            \"re-detect\": false\n"
 "        },\n"
 "        \"lease-database\": {\n"
 "            \"type\": \"memfile\"\n"
@@ -1545,7 +1546,8 @@ const char* UNPARSED_CONFIGS[] = {
 "        \"hooks-libraries\": [ ],\n"
 "        \"host-reservation-identifiers\": [ \"hw-address\", \"duid\" ],\n"
 "        \"interfaces-config\": {\n"
-"            \"interfaces\": [ \"*\" ]\n"
+"            \"interfaces\": [ \"*\" ],\n"
+"            \"re-detect\": false\n"
 "        },\n"
 "        \"lease-database\": {\n"
 "            \"type\": \"memfile\"\n"
@@ -1620,7 +1622,8 @@ const char* UNPARSED_CONFIGS[] = {
 "        \"hooks-libraries\": [ ],\n"
 "        \"host-reservation-identifiers\": [ \"hw-address\", \"duid\" ],\n"
 "        \"interfaces-config\": {\n"
-"            \"interfaces\": [ \"*\" ]\n"
+"            \"interfaces\": [ \"*\" ],\n"
+"            \"re-detect\": false\n"
 "        },\n"
 "        \"lease-database\": {\n"
 "            \"type\": \"memfile\"\n"
@@ -1767,7 +1770,8 @@ const char* UNPARSED_CONFIGS[] = {
 "        \"hooks-libraries\": [ ],\n"
 "        \"host-reservation-identifiers\": [ \"hw-address\", \"duid\" ],\n"
 "        \"interfaces-config\": {\n"
-"            \"interfaces\": [ \"*\" ]\n"
+"            \"interfaces\": [ \"*\" ],\n"
+"            \"re-detect\": false\n"
 "        },\n"
 "        \"lease-database\": {\n"
 "            \"type\": \"memfile\"\n"
@@ -1914,7 +1918,8 @@ const char* UNPARSED_CONFIGS[] = {
 "        \"hooks-libraries\": [ ],\n"
 "        \"host-reservation-identifiers\": [ \"hw-address\", \"duid\" ],\n"
 "        \"interfaces-config\": {\n"
-"            \"interfaces\": [ \"*\" ]\n"
+"            \"interfaces\": [ \"*\" ],\n"
+"            \"re-detect\": false\n"
 "        },\n"
 "        \"lease-database\": {\n"
 "            \"type\": \"memfile\"\n"
@@ -2061,7 +2066,8 @@ const char* UNPARSED_CONFIGS[] = {
 "        \"hooks-libraries\": [ ],\n"
 "        \"host-reservation-identifiers\": [ \"hw-address\", \"duid\" ],\n"
 "        \"interfaces-config\": {\n"
-"            \"interfaces\": [ \"*\" ]\n"
+"            \"interfaces\": [ \"*\" ],\n"
+"            \"re-detect\": false\n"
 "        },\n"
 "        \"lease-database\": {\n"
 "            \"type\": \"memfile\"\n"
@@ -2136,7 +2142,8 @@ const char* UNPARSED_CONFIGS[] = {
 "        \"hooks-libraries\": [ ],\n"
 "        \"host-reservation-identifiers\": [ \"hw-address\", \"duid\" ],\n"
 "        \"interfaces-config\": {\n"
-"            \"interfaces\": [ \"*\" ]\n"
+"            \"interfaces\": [ \"*\" ],\n"
+"            \"re-detect\": false\n"
 "        },\n"
 "        \"lease-database\": {\n"
 "            \"type\": \"memfile\"\n"
@@ -2211,7 +2218,8 @@ const char* UNPARSED_CONFIGS[] = {
 "        \"hooks-libraries\": [ ],\n"
 "        \"host-reservation-identifiers\": [ \"hw-address\", \"duid\" ],\n"
 "        \"interfaces-config\": {\n"
-"            \"interfaces\": [ ]\n"
+"            \"interfaces\": [ ],\n"
+"            \"re-detect\": false\n"
 "        },\n"
 "        \"lease-database\": {\n"
 "            \"type\": \"memfile\"\n"
@@ -2286,7 +2294,8 @@ const char* UNPARSED_CONFIGS[] = {
 "        \"hooks-libraries\": [ ],\n"
 "        \"host-reservation-identifiers\": [ \"hw-address\", \"duid\" ],\n"
 "        \"interfaces-config\": {\n"
-"            \"interfaces\": [ \"*\" ]\n"
+"            \"interfaces\": [ \"*\" ],\n"
+"            \"re-detect\": false\n"
 "        },\n"
 "        \"lease-database\": {\n"
 "            \"type\": \"memfile\"\n"
@@ -2393,7 +2402,8 @@ const char* UNPARSED_CONFIGS[] = {
 "        \"hooks-libraries\": [ ],\n"
 "        \"host-reservation-identifiers\": [ \"hw-address\", \"duid\" ],\n"
 "        \"interfaces-config\": {\n"
-"            \"interfaces\": [ \"*\" ]\n"
+"            \"interfaces\": [ \"*\" ],\n"
+"            \"re-detect\": false\n"
 "        },\n"
 "        \"lease-database\": {\n"
 "            \"type\": \"memfile\"\n"
@@ -2468,7 +2478,8 @@ const char* UNPARSED_CONFIGS[] = {
 "        \"hooks-libraries\": [ ],\n"
 "        \"host-reservation-identifiers\": [ \"hw-address\", \"duid\" ],\n"
 "        \"interfaces-config\": {\n"
-"            \"interfaces\": [ \"*\" ]\n"
+"            \"interfaces\": [ \"*\" ],\n"
+"            \"re-detect\": false\n"
 "        },\n"
 "        \"lease-database\": {\n"
 "            \"type\": \"memfile\"\n"
@@ -2547,7 +2558,8 @@ const char* UNPARSED_CONFIGS[] = {
 "        \"hooks-libraries\": [ ],\n"
 "        \"host-reservation-identifiers\": [ \"hw-address\", \"duid\" ],\n"
 "        \"interfaces-config\": {\n"
-"            \"interfaces\": [ \"*\" ]\n"
+"            \"interfaces\": [ \"*\" ],\n"
+"            \"re-detect\": false\n"
 "        },\n"
 "        \"lease-database\": {\n"
 "            \"type\": \"memfile\"\n"
@@ -2626,7 +2638,8 @@ const char* UNPARSED_CONFIGS[] = {
 "        \"hooks-libraries\": [ ],\n"
 "        \"host-reservation-identifiers\": [ \"hw-address\", \"duid\" ],\n"
 "        \"interfaces-config\": {\n"
-"            \"interfaces\": [ \"*\" ]\n"
+"            \"interfaces\": [ \"*\" ],\n"
+"            \"re-detect\": false\n"
 "        },\n"
 "        \"lease-database\": {\n"
 "            \"type\": \"memfile\"\n"
@@ -2726,7 +2739,8 @@ const char* UNPARSED_CONFIGS[] = {
 "        \"hooks-libraries\": [ ],\n"
 "        \"host-reservation-identifiers\": [ \"hw-address\", \"duid\" ],\n"
 "        \"interfaces-config\": {\n"
-"            \"interfaces\": [ \"*\" ]\n"
+"            \"interfaces\": [ \"*\" ],\n"
+"            \"re-detect\": false\n"
 "        },\n"
 "        \"lease-database\": {\n"
 "            \"type\": \"memfile\"\n"
@@ -2805,7 +2819,8 @@ const char* UNPARSED_CONFIGS[] = {
 "        \"hooks-libraries\": [ ],\n"
 "        \"host-reservation-identifiers\": [ \"hw-address\", \"duid\" ],\n"
 "        \"interfaces-config\": {\n"
-"            \"interfaces\": [ ]\n"
+"            \"interfaces\": [ ],\n"
+"            \"re-detect\": false\n"
 "        },\n"
 "        \"lease-database\": {\n"
 "            \"type\": \"memfile\"\n"
@@ -2865,7 +2880,8 @@ const char* UNPARSED_CONFIGS[] = {
 "        \"hooks-libraries\": [ ],\n"
 "        \"host-reservation-identifiers\": [ \"hw-address\", \"duid\" ],\n"
 "        \"interfaces-config\": {\n"
-"            \"interfaces\": [ ]\n"
+"            \"interfaces\": [ ],\n"
+"            \"re-detect\": false\n"
 "        },\n"
 "        \"lease-database\": {\n"
 "            \"type\": \"memfile\"\n"
@@ -2925,7 +2941,8 @@ const char* UNPARSED_CONFIGS[] = {
 "        \"hooks-libraries\": [ ],\n"
 "        \"host-reservation-identifiers\": [ \"hw-address\", \"duid\" ],\n"
 "        \"interfaces-config\": {\n"
-"            \"interfaces\": [ ]\n"
+"            \"interfaces\": [ ],\n"
+"            \"re-detect\": false\n"
 "        },\n"
 "        \"lease-database\": {\n"
 "            \"type\": \"memfile\"\n"
@@ -2994,7 +3011,8 @@ const char* UNPARSED_CONFIGS[] = {
 "        \"hooks-libraries\": [ ],\n"
 "        \"host-reservation-identifiers\": [ \"hw-address\", \"duid\" ],\n"
 "        \"interfaces-config\": {\n"
-"            \"interfaces\": [ ]\n"
+"            \"interfaces\": [ ],\n"
+"            \"re-detect\": false\n"
 "        },\n"
 "        \"lease-database\": {\n"
 "            \"type\": \"memfile\"\n"
@@ -3054,7 +3072,8 @@ const char* UNPARSED_CONFIGS[] = {
 "        \"hooks-libraries\": [ ],\n"
 "        \"host-reservation-identifiers\": [ \"hw-address\", \"duid\" ],\n"
 "        \"interfaces-config\": {\n"
-"            \"interfaces\": [ ]\n"
+"            \"interfaces\": [ ],\n"
+"            \"re-detect\": false\n"
 "        },\n"
 "        \"lease-database\": {\n"
 "            \"type\": \"memfile\"\n"
@@ -3114,7 +3133,8 @@ const char* UNPARSED_CONFIGS[] = {
 "        \"hooks-libraries\": [ ],\n"
 "        \"host-reservation-identifiers\": [ \"hw-address\", \"duid\" ],\n"
 "        \"interfaces-config\": {\n"
-"            \"interfaces\": [ \"*\" ]\n"
+"            \"interfaces\": [ \"*\" ],\n"
+"            \"re-detect\": false\n"
 "        },\n"
 "        \"lease-database\": {\n"
 "            \"type\": \"memfile\"\n"
@@ -3204,7 +3224,8 @@ const char* UNPARSED_CONFIGS[] = {
 "        \"hooks-libraries\": [ ],\n"
 "        \"host-reservation-identifiers\": [ \"hw-address\", \"duid\" ],\n"
 "        \"interfaces-config\": {\n"
-"            \"interfaces\": [ \"*\" ]\n"
+"            \"interfaces\": [ \"*\" ],\n"
+"            \"re-detect\": false\n"
 "        },\n"
 "        \"lease-database\": {\n"
 "            \"type\": \"memfile\"\n"
@@ -3294,7 +3315,8 @@ const char* UNPARSED_CONFIGS[] = {
 "        \"hooks-libraries\": [ ],\n"
 "        \"host-reservation-identifiers\": [ \"hw-address\", \"duid\" ],\n"
 "        \"interfaces-config\": {\n"
-"            \"interfaces\": [ \"*\" ]\n"
+"            \"interfaces\": [ \"*\" ],\n"
+"            \"re-detect\": false\n"
 "        },\n"
 "        \"lease-database\": {\n"
 "            \"type\": \"memfile\"\n"
@@ -3394,7 +3416,8 @@ const char* UNPARSED_CONFIGS[] = {
 "        \"hooks-libraries\": [ ],\n"
 "        \"host-reservation-identifiers\": [ \"hw-address\", \"duid\" ],\n"
 "        \"interfaces-config\": {\n"
-"            \"interfaces\": [ \"*\" ]\n"
+"            \"interfaces\": [ \"*\" ],\n"
+"            \"re-detect\": false\n"
 "        },\n"
 "        \"lease-database\": {\n"
 "            \"type\": \"memfile\"\n"
@@ -3478,7 +3501,8 @@ const char* UNPARSED_CONFIGS[] = {
 "        \"hooks-libraries\": [ ],\n"
 "        \"host-reservation-identifiers\": [ \"hw-address\", \"duid\" ],\n"
 "        \"interfaces-config\": {\n"
-"            \"interfaces\": [ \"*\" ]\n"
+"            \"interfaces\": [ \"*\" ],\n"
+"            \"re-detect\": false\n"
 "        },\n"
 "        \"lease-database\": {\n"
 "            \"type\": \"memfile\"\n"
@@ -3603,7 +3627,8 @@ const char* UNPARSED_CONFIGS[] = {
 "        \"hooks-libraries\": [ ],\n"
 "        \"host-reservation-identifiers\": [ \"hw-address\", \"duid\" ],\n"
 "        \"interfaces-config\": {\n"
-"            \"interfaces\": [ \"*\" ]\n"
+"            \"interfaces\": [ \"*\" ],\n"
+"            \"re-detect\": false\n"
 "        },\n"
 "        \"lease-database\": {\n"
 "            \"type\": \"memfile\"\n"
@@ -3718,7 +3743,8 @@ const char* UNPARSED_CONFIGS[] = {
 "        \"hooks-libraries\": [ ],\n"
 "        \"host-reservation-identifiers\": [ \"hw-address\", \"duid\" ],\n"
 "        \"interfaces-config\": {\n"
-"            \"interfaces\": [ \"*\" ]\n"
+"            \"interfaces\": [ \"*\" ],\n"
+"            \"re-detect\": false\n"
 "        },\n"
 "        \"lease-database\": {\n"
 "            \"type\": \"memfile\"\n"
@@ -3846,7 +3872,8 @@ const char* UNPARSED_CONFIGS[] = {
 "        \"hooks-libraries\": [ ],\n"
 "        \"host-reservation-identifiers\": [ \"hw-address\", \"duid\" ],\n"
 "        \"interfaces-config\": {\n"
-"            \"interfaces\": [ \"*\" ]\n"
+"            \"interfaces\": [ \"*\" ],\n"
+"            \"re-detect\": false\n"
 "        },\n"
 "        \"lease-database\": {\n"
 "            \"type\": \"memfile\"\n"
@@ -3934,7 +3961,8 @@ const char* UNPARSED_CONFIGS[] = {
 "        \"hooks-libraries\": [ ],\n"
 "        \"host-reservation-identifiers\": [ \"hw-address\", \"duid\" ],\n"
 "        \"interfaces-config\": {\n"
-"            \"interfaces\": [ \"*\" ]\n"
+"            \"interfaces\": [ \"*\" ],\n"
+"            \"re-detect\": false\n"
 "        },\n"
 "        \"lease-database\": {\n"
 "            \"type\": \"memfile\"\n"
@@ -4027,7 +4055,8 @@ const char* UNPARSED_CONFIGS[] = {
 "        \"hooks-libraries\": [ ],\n"
 "        \"host-reservation-identifiers\": [ \"hw-address\", \"duid\" ],\n"
 "        \"interfaces-config\": {\n"
-"            \"interfaces\": [ \"eth0\" ]\n"
+"            \"interfaces\": [ \"eth0\" ],\n"
+"            \"re-detect\": false\n"
 "        },\n"
 "        \"lease-database\": {\n"
 "            \"type\": \"memfile\"\n"
@@ -4077,7 +4106,8 @@ const char* UNPARSED_CONFIGS[] = {
 "        \"hooks-libraries\": [ ],\n"
 "        \"host-reservation-identifiers\": [ \"hw-address\", \"duid\" ],\n"
 "        \"interfaces-config\": {\n"
-"            \"interfaces\": [ \"*\", \"eth0\", \"eth1\" ]\n"
+"            \"interfaces\": [ \"*\", \"eth0\", \"eth1\" ],\n"
+"            \"re-detect\": false\n"
 "        },\n"
 "        \"lease-database\": {\n"
 "            \"type\": \"memfile\"\n"
@@ -4127,7 +4157,8 @@ const char* UNPARSED_CONFIGS[] = {
 "        \"hooks-libraries\": [ ],\n"
 "        \"host-reservation-identifiers\": [ \"hw-address\", \"duid\" ],\n"
 "        \"interfaces-config\": {\n"
-"            \"interfaces\": [ \"*\" ]\n"
+"            \"interfaces\": [ \"*\" ],\n"
+"            \"re-detect\": false\n"
 "        },\n"
 "        \"lease-database\": {\n"
 "            \"type\": \"memfile\"\n"
@@ -4202,7 +4233,8 @@ const char* UNPARSED_CONFIGS[] = {
 "        \"hooks-libraries\": [ ],\n"
 "        \"host-reservation-identifiers\": [ \"hw-address\", \"duid\" ],\n"
 "        \"interfaces-config\": {\n"
-"            \"interfaces\": [ \"*\" ]\n"
+"            \"interfaces\": [ \"*\" ],\n"
+"            \"re-detect\": false\n"
 "        },\n"
 "        \"lease-database\": {\n"
 "            \"type\": \"memfile\"\n"
@@ -4352,7 +4384,8 @@ const char* UNPARSED_CONFIGS[] = {
 "        \"hooks-libraries\": [ ],\n"
 "        \"host-reservation-identifiers\": [ \"hw-address\", \"duid\" ],\n"
 "        \"interfaces-config\": {\n"
-"            \"interfaces\": [ \"*\" ]\n"
+"            \"interfaces\": [ \"*\" ],\n"
+"            \"re-detect\": false\n"
 "        },\n"
 "        \"lease-database\": {\n"
 "            \"type\": \"memfile\"\n"
@@ -4427,7 +4460,8 @@ const char* UNPARSED_CONFIGS[] = {
 "        \"hooks-libraries\": [ ],\n"
 "        \"host-reservation-identifiers\": [ \"hw-address\", \"duid\" ],\n"
 "        \"interfaces-config\": {\n"
-"            \"interfaces\": [ \"*\" ]\n"
+"            \"interfaces\": [ \"*\" ],\n"
+"            \"re-detect\": false\n"
 "        },\n"
 "        \"lease-database\": {\n"
 "            \"type\": \"memfile\"\n"
@@ -4619,7 +4653,8 @@ const char* UNPARSED_CONFIGS[] = {
 "        \"hooks-libraries\": [ ],\n"
 "        \"host-reservation-identifiers\": [ \"hw-address\", \"duid\" ],\n"
 "        \"interfaces-config\": {\n"
-"            \"interfaces\": [ \"*\" ]\n"
+"            \"interfaces\": [ \"*\" ],\n"
+"            \"re-detect\": false\n"
 "        },\n"
 "        \"lease-database\": {\n"
 "            \"type\": \"memfile\"\n"
@@ -4716,7 +4751,8 @@ const char* UNPARSED_CONFIGS[] = {
 "        \"hooks-libraries\": [ ],\n"
 "        \"host-reservation-identifiers\": [ \"hw-address\", \"duid\" ],\n"
 "        \"interfaces-config\": {\n"
-"            \"interfaces\": [ \"*\" ]\n"
+"            \"interfaces\": [ \"*\" ],\n"
+"            \"re-detect\": false\n"
 "        },\n"
 "        \"lease-database\": {\n"
 "            \"type\": \"memfile\"\n"
@@ -4766,7 +4802,8 @@ const char* UNPARSED_CONFIGS[] = {
 "        \"hooks-libraries\": [ ],\n"
 "        \"host-reservation-identifiers\": [ \"hw-address\", \"duid\" ],\n"
 "        \"interfaces-config\": {\n"
-"            \"interfaces\": [ \"*\" ]\n"
+"            \"interfaces\": [ \"*\" ],\n"
+"            \"re-detect\": false\n"
 "        },\n"
 "        \"lease-database\": {\n"
 "            \"type\": \"memfile\"\n"
@@ -4816,7 +4853,8 @@ const char* UNPARSED_CONFIGS[] = {
 "        \"hooks-libraries\": [ ],\n"
 "        \"host-reservation-identifiers\": [ \"hw-address\", \"duid\" ],\n"
 "        \"interfaces-config\": {\n"
-"            \"interfaces\": [ ]\n"
+"            \"interfaces\": [ ],\n"
+"            \"re-detect\": false\n"
 "        },\n"
 "        \"lease-database\": {\n"
 "            \"type\": \"memfile\"\n"
@@ -4963,7 +5001,8 @@ const char* UNPARSED_CONFIGS[] = {
 "        \"hooks-libraries\": [ ],\n"
 "        \"host-reservation-identifiers\": [ \"hw-address\", \"duid\" ],\n"
 "        \"interfaces-config\": {\n"
-"            \"interfaces\": [ \"*\" ]\n"
+"            \"interfaces\": [ \"*\" ],\n"
+"            \"re-detect\": false\n"
 "        },\n"
 "        \"lease-database\": {\n"
 "            \"type\": \"memfile\"\n"
@@ -5013,7 +5052,8 @@ const char* UNPARSED_CONFIGS[] = {
 "        \"hooks-libraries\": [ ],\n"
 "        \"host-reservation-identifiers\": [ \"hw-address\", \"duid\" ],\n"
 "        \"interfaces-config\": {\n"
-"            \"interfaces\": [ \"*\" ]\n"
+"            \"interfaces\": [ \"*\" ],\n"
+"            \"re-detect\": false\n"
 "        },\n"
 "        \"lease-database\": {\n"
 "            \"type\": \"memfile\"\n"
@@ -5063,7 +5103,8 @@ const char* UNPARSED_CONFIGS[] = {
 "        \"hooks-libraries\": [ ],\n"
 "        \"host-reservation-identifiers\": [ \"hw-address\", \"duid\" ],\n"
 "        \"interfaces-config\": {\n"
-"            \"interfaces\": [ \"*\" ]\n"
+"            \"interfaces\": [ \"*\" ],\n"
+"            \"re-detect\": false\n"
 "        },\n"
 "        \"lease-database\": {\n"
 "            \"type\": \"memfile\"\n"
@@ -5113,7 +5154,8 @@ const char* UNPARSED_CONFIGS[] = {
 "        \"hooks-libraries\": [ ],\n"
 "        \"host-reservation-identifiers\": [ \"hw-address\", \"duid\" ],\n"
 "        \"interfaces-config\": {\n"
-"            \"interfaces\": [ \"*\" ]\n"
+"            \"interfaces\": [ \"*\" ],\n"
+"            \"re-detect\": false\n"
 "        },\n"
 "        \"lease-database\": {\n"
 "            \"type\": \"memfile\"\n"
@@ -5163,7 +5205,8 @@ const char* UNPARSED_CONFIGS[] = {
 "        \"hooks-libraries\": [ ],\n"
 "        \"host-reservation-identifiers\": [ \"hw-address\", \"duid\" ],\n"
 "        \"interfaces-config\": {\n"
-"            \"interfaces\": [ \"*\" ]\n"
+"            \"interfaces\": [ \"*\" ],\n"
+"            \"re-detect\": false\n"
 "        },\n"
 "        \"lease-database\": {\n"
 "            \"type\": \"memfile\"\n"
@@ -5227,7 +5270,8 @@ const char* UNPARSED_CONFIGS[] = {
 "        \"hooks-libraries\": [ ],\n"
 "        \"host-reservation-identifiers\": [ \"hw-address\", \"duid\" ],\n"
 "        \"interfaces-config\": {\n"
-"            \"interfaces\": [ \"*\" ]\n"
+"            \"interfaces\": [ \"*\" ],\n"
+"            \"re-detect\": false\n"
 "        },\n"
 "        \"lease-database\": {\n"
 "            \"type\": \"memfile\"\n"
@@ -5302,7 +5346,8 @@ const char* UNPARSED_CONFIGS[] = {
 "        \"hooks-libraries\": [ ],\n"
 "        \"host-reservation-identifiers\": [ \"hw-address\", \"duid\" ],\n"
 "        \"interfaces-config\": {\n"
-"            \"interfaces\": [ \"*\" ]\n"
+"            \"interfaces\": [ \"*\" ],\n"
+"            \"re-detect\": false\n"
 "        },\n"
 "        \"lease-database\": {\n"
 "            \"type\": \"memfile\"\n"
@@ -5377,7 +5422,8 @@ const char* UNPARSED_CONFIGS[] = {
 "        \"hooks-libraries\": [ ],\n"
 "        \"host-reservation-identifiers\": [ \"hw-address\", \"duid\" ],\n"
 "        \"interfaces-config\": {\n"
-"            \"interfaces\": [ \"*\" ]\n"
+"            \"interfaces\": [ \"*\" ],\n"
+"            \"re-detect\": false\n"
 "        },\n"
 "        \"lease-database\": {\n"
 "            \"type\": \"memfile\"\n"
@@ -5453,7 +5499,8 @@ const char* UNPARSED_CONFIGS[] = {
 "        \"hooks-libraries\": [ ],\n"
 "        \"host-reservation-identifiers\": [ \"hw-address\", \"duid\" ],\n"
 "        \"interfaces-config\": {\n"
-"            \"interfaces\": [ \"*\" ]\n"
+"            \"interfaces\": [ \"*\" ],\n"
+"            \"re-detect\": false\n"
 "        },\n"
 "        \"lease-database\": {\n"
 "            \"type\": \"memfile\"\n"
@@ -5534,7 +5581,8 @@ const char* UNPARSED_CONFIGS[] = {
 "        \"hooks-libraries\": [ ],\n"
 "        \"host-reservation-identifiers\": [ \"hw-address\", \"duid\" ],\n"
 "        \"interfaces-config\": {\n"
-"            \"interfaces\": [ \"*\" ]\n"
+"            \"interfaces\": [ \"*\" ],\n"
+"            \"re-detect\": false\n"
 "        },\n"
 "        \"lease-database\": {\n"
 "            \"type\": \"memfile\"\n"
@@ -5615,7 +5663,8 @@ const char* UNPARSED_CONFIGS[] = {
 "        \"hooks-libraries\": [ ],\n"
 "        \"host-reservation-identifiers\": [ \"hw-address\", \"duid\" ],\n"
 "        \"interfaces-config\": {\n"
-"            \"interfaces\": [ \"*\" ]\n"
+"            \"interfaces\": [ \"*\" ],\n"
+"            \"re-detect\": false\n"
 "        },\n"
 "        \"lease-database\": {\n"
 "            \"type\": \"memfile\"\n"
@@ -5694,7 +5743,8 @@ const char* UNPARSED_CONFIGS[] = {
 "        \"hooks-libraries\": [ ],\n"
 "        \"host-reservation-identifiers\": [ \"hw-address\", \"duid\" ],\n"
 "        \"interfaces-config\": {\n"
-"            \"interfaces\": [ \"*\" ]\n"
+"            \"interfaces\": [ \"*\" ],\n"
+"            \"re-detect\": false\n"
 "        },\n"
 "        \"lease-database\": {\n"
 "            \"type\": \"memfile\"\n"
@@ -5774,7 +5824,8 @@ const char* UNPARSED_CONFIGS[] = {
 "        \"hooks-libraries\": [ ],\n"
 "        \"host-reservation-identifiers\": [ \"hw-address\", \"duid\" ],\n"
 "        \"interfaces-config\": {\n"
-"            \"interfaces\": [ \"*\" ]\n"
+"            \"interfaces\": [ \"*\" ],\n"
+"            \"re-detect\": false\n"
 "        },\n"
 "        \"lease-database\": {\n"
 "            \"type\": \"memfile\"\n"
@@ -6100,6 +6151,6 @@ TEST_P(Dhcp6GetConfigTest, run) {
 
 /// Define the parametrized test loop
 INSTANTIATE_TEST_CASE_P(Dhcp6GetConfigTest, Dhcp6GetConfigTest,
-                        ::testing::Range(static_cast<size_t>(0), max_config_counter));
+                        ::testing::Range(0UL, max_config_counter));
 
 };

src/lib/dhcpsrv/cfg_iface.cc

@@ -22,7 +22,7 @@ namespace dhcp {
 const char* CfgIface::ALL_IFACES_KEYWORD = "*";
 
 CfgIface::CfgIface()
-    : wildcard_used_(false), socket_type_(SOCKET_RAW) {
+    : wildcard_used_(false), socket_type_(SOCKET_RAW), re_detect_(false) {
 }
 
 void
@@ -425,6 +425,9 @@ CfgIface::toElement() const {
         result->set("dhcp-socket-type", Element::create(std::string("udp")));
     }
 
+    // Set re-detect
+    result->set("re-detect", Element::create(re_detect_));
+
     return (result);
 }
 

src/lib/dhcpsrv/cfg_iface.h

@@ -257,6 +257,13 @@ public:
     /// @return a pointer to unparsed configuration
     virtual isc::data::ElementPtr toElement() const;
 
+    /// @brief Set the re-detect flag
+    ///
+    /// @param re_detect the new value of the flag
+    void setReDetect(bool re_detect) {
+        re_detect_ = re_detect;
+    }
+
 private:
 
     /// @brief Checks if multiple IPv4 addresses has been activated on any
@@ -330,6 +337,9 @@ private:
 
     /// @brief A type of the sockets used by the DHCP server.
     SocketType socket_type_;
+
+    /// @brief A boolean value which reflects current re-detect setting
+    bool re_detect_;
 };
 
 /// @brief A pointer to the @c CfgIface .

src/lib/dhcpsrv/parsers/ifaces_config_parser.cc

@@ -41,16 +41,18 @@ void
 IfacesConfigParser::parse(const CfgIfacePtr& cfg,
                           const isc::data::ConstElementPtr& ifaces_config) {
 
-    // Get the pointer to the interface configuration.
+    // Check for re-detect before calling parseInterfacesList() 
+    bool re_detect = getBoolean(ifaces_config, "re-detect");
+    cfg->setReDetect(re_detect);
+    if (re_detect) {
+        IfaceMgr::instance().clearIfaces();
+        IfaceMgr::instance().detectIfaces();
+    }
+
     bool socket_type_specified = false;
     BOOST_FOREACH(ConfigPair element, ifaces_config->mapValue()) {
         try {
-            // Check for re-detect before calling parseInterfacesList() 
             if (element.first == "re-detect") {
-                if (element.second->boolValue()) {
-                    IfaceMgr::instance().clearIfaces();
-                    IfaceMgr::instance().detectIfaces();
-                }
                 continue;
             }
 

src/lib/dhcpsrv/tests/cfg_iface_unittest.cc

@@ -371,7 +371,8 @@ TEST_F(CfgIfaceTest, unparse) {
     
     // Check unparse
     std::string expected =
-        "{ \"interfaces\": [ \"*\", \"eth0\", \"eth1/192.0.2.3\" ] }";
+        "{ \"interfaces\": [ \"*\", \"eth0\", \"eth1/192.0.2.3\" ], "
+        "\"re-detect\": false }";
     runToElementTest<CfgIface>(expected, cfg4);
 
     // Now check IPv6
@@ -381,7 +382,8 @@ TEST_F(CfgIfaceTest, unparse) {
     EXPECT_NO_THROW(cfg6.use(AF_INET6, "eth0/2001:db8:1::1"));
 
     expected =
-        "{ \"interfaces\": [ \"*\", \"eth1\", \"eth0/2001:db8:1::1\" ] }";
+        "{ \"interfaces\": [ \"*\", \"eth1\", \"eth0/2001:db8:1::1\" ], "
+        "\"re-detect\": false }";
     runToElementTest<CfgIface>(expected, cfg6);
 }
 
@@ -402,7 +404,8 @@ TEST(CfgIfaceNoStubTest, useSocketType) {
     // Check unparse
     std::string expected = "{\n"
         " \"interfaces\": [ ],\n"
-        " \"dhcp-socket-type\": \"udp\" }";
+        " \"dhcp-socket-type\": \"udp\",\n"
+        " \"re-detect\": false }";
     runToElementTest<CfgIface>(expected, cfg);
 
     // Select raw sockets.

src/lib/dhcpsrv/tests/ifaces_config_parser_unittest.cc

@@ -53,7 +53,8 @@ TEST_F(IfacesConfigParserTest, interfaces) {
     IfaceMgrTestConfig test_config(true);
 
     // Configuration with one interface.
-    std::string config = "{ ""\"interfaces\": [ \"eth0\" ] }";
+    std::string config =
+        "{ \"interfaces\": [ \"eth0\" ], \"re-detect\": false }";
 
     ElementPtr config_element = Element::fromJSON(config);
 
@@ -81,7 +82,7 @@ TEST_F(IfacesConfigParserTest, interfaces) {
 
     // Try similar configuration but this time add a wildcard interface
     // to see if sockets will open on all interfaces.
-    config = "{ \"interfaces\": [ \"eth0\", \"*\" ] }";
+    config = "{ \"interfaces\": [ \"eth0\", \"*\" ], \"re-detect\": false }";
     config_element = Element::fromJSON(config);
 
     cfg_iface = CfgMgr::instance().getStagingCfg()->getCfgIface();
@@ -106,7 +107,8 @@ TEST_F(IfacesConfigParserTest, socketTypeRaw) {
 
     // Configuration with a raw socket selected.
     std::string config = "{ ""\"interfaces\": [ ],"
-        " \"dhcp-socket-type\": \"raw\" }";
+        " \"dhcp-socket-type\": \"raw\","
+        " \"re-detect\": false }";
 
     ElementPtr config_element = Element::fromJSON(config);
 
@@ -132,7 +134,8 @@ TEST_F(IfacesConfigParserTest, socketTypeDatagram) {
 
     // Configuration with a datagram socket selected.
     std::string config = "{ \"interfaces\": [ ],"
-        " \"dhcp-socket-type\": \"udp\" }";
+        " \"dhcp-socket-type\": \"udp\","
+        " \"re-detect\": false }";
 
     ElementPtr config_element = Element::fromJSON(config);
 
@@ -160,14 +163,16 @@ TEST_F(IfacesConfigParserTest, socketTypeInvalid) {
     IfacesConfigParser parser4(AF_INET);
     CfgIfacePtr cfg_iface = CfgMgr::instance().getStagingCfg()->getCfgIface();
     std::string config = "{ \"interfaces\": [ ],"
-        "\"dhcp-socket-type\": \"default\" }";
+        "\"dhcp-socket-type\": \"default\","
+        " \"re-detect\": false }";
     ElementPtr config_element = Element::fromJSON(config);
     ASSERT_THROW(parser4.parse(cfg_iface, config_element), DhcpConfigError);
 
     // For DHCPv6 we don't accept any socket type.
     IfacesConfigParser parser6(AF_INET6);
     config = "{ \"interfaces\": [ ],"
-        " \"dhcp-socket-type\": \"udp\" }";
+        " \"dhcp-socket-type\": \"udp\","
+        " \"re-detect\": false }";
     config_element = Element::fromJSON(config);
     ASSERT_THROW(parser6.parse(cfg_iface, config_element), DhcpConfigError);
 }

src/lib/dhcpsrv/tests/srv_config_unittest.cc

@@ -437,7 +437,8 @@ TEST_F(SrvConfigTest, unparse) {
 
     std::string defaults = "\"decline-probation-period\": 0,\n";
     defaults += "\"dhcp4o6-port\": 0,\n";
-    defaults += "\"interfaces-config\": { \"interfaces\": [ ] },\n";
+    defaults += "\"interfaces-config\": { \"interfaces\": [ ],\n";
+    defaults += " \"re-detect\": false },\n";
     defaults += "\"option-def\": [ ],\n";
     defaults += "\"option-data\": [ ],\n";
     defaults += "\"expired-leases-processing\": ";