[jboss-jira] [JBoss JIRA] (WFLY-4685) Do not transform IPv4 multicast address to IPv6 anycast address on dual stack machines

[Bela Ban (JIRA)]

    [ https://issues.jboss.org/browse/WFLY-4685?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13071477#comment-13071477 ] 

Bela Ban commented on WFLY-4685:
--------------------------------

I don't see the issue here: why don't you just set {{-Djava.net.preferIPv4Stack}} to {{true}} instead of {{false}} if you want an IPv4 multicast address ?
Also: you created 3 identical issues (187,189, and WFLY): why one is the one to be used ?

> 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? 



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