[jboss-jira] [JBoss JIRA] (WFLY-4685) Do not transform IPv4 multicast address to IPv6 anycast address on dual stack machines
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https://issues.jboss.org/browse/WFLY-4685?page=com.atlassian.jira.plugin....
]
Miroslav Novak commented on WFLY-4685:
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It's possible to start server with -Djava.net.preferIPv4Stack set to true to avoid
IPv4 multicast ->IPv6 anycast conversion. Question is what should happen if
java.net.preferIPv4Stack is false?
It allows to bind server to IPv4 or IPv6 address per need. At this moment it respects
whether IPv4 or IPv6 address is specified. Setting 192.168.40.1 as bind address (with
-Djava.net.preferIPv4Stack=false) does not bind server to IPv4-mapped IPv6 address
::192.168.40.1. From user point of view it's not intuitive IPv4 multicast ->IPv6
anycast conversion if IPv4 multicast was set.
I've added Richard as he knows a lot about IPv6.
It's not possible to clone jira to another project. I had to clone it first and then
move to Wildfly. JBEAP-189 was temp product before moving it here, to WFLY-4685.
Do not transform IPv4 multicast address to IPv6 anycast address on
dual stack machines
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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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