Add hardcoded MAC address for multicast in DevilutionX

src/VirtualTap.cpp

@@ -214,6 +214,11 @@ void VirtualTap::scanMulticastGroups(std::vector<MulticastGroup>& added, std::ve
     std::vector<MulticastGroup> newGroups;
     Mutex::Lock _l(_multicastGroups_m);
     // TODO: get multicast subscriptions
+
+    // Hardcoded MAC for IPv6 multicast address
+    // ff0e:a8a9:b611:58ce:0412:fd73:3786:6fb7
+    newGroups.push_back(MulticastGroup(MAC(0x33, 0x33, 0x37, 0x86, 0x6f, 0xb7), 0));
+
     std::vector<InetAddress> allIps(ips());
     for (std::vector<InetAddress>::iterator ip(allIps.begin()); ip != allIps.end(); ++ip)
         newGroups.push_back(MulticastGroup::deriveMulticastGroupForAddressResolution(*ip));