Do not transform IPv4 multicast address to IPv6 anycast address on dual stack machines -------------------------------------------------------------------------------------- Key: WFLY-4685 URL: https://issues.jboss.org/browse/WFLY-4685 Project: WildFly Issue Type: Bug Components: Clustering Affects Versions: 10.0.0.Alpha1 Reporter: Miroslav Novak Assignee: Bela Ban If EAP 7.0.0.DR2 is started with -Djava.net.preferIPv4Stack=false (and java.net.preferIPv6Addresses=false) then JGroups convert IPv4 multicast address (jboss.default.multicast.address=230.0.0.4) to IPv6 anycast address on dualstack machines. This is done in class org.jgroups.conf.PropertyConverters (line 291-295): {code} ... if(retval instanceof Inet4Address && retval.isMulticastAddress() && Util.getIpStackType() == StackType.IPv6) { String tmp=prefix + propertyValue; retval=InetAddress.getByName(tmp); return retval; } ... {code} This behaviour is overriding user preference to use IPv4 multicast instead of IPv6 anycast. Can this conversion be removed?