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

[Romain Pelisse (JIRA)]

    [ https://issues.jboss.org/browse/WFLY-4685?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13121786#comment-13121786 ] 

Romain Pelisse commented on WFLY-4685:
--------------------------------------

[~mnovak] [~belaban] Miroslav, I do agree with Bela that it might not be something we want to support. As it does not sound there much requirement around this, i'm going to close this as WONTFIX. Hopefully, if this feature is really needed, people will reopen this entry.

> 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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