[jboss-jira] [JBoss JIRA] (JGRP-2023) Network unreachable with localhost addresses if -Djava.net.preferIPv4Stack=true isn't specified

[Richard Janík (JIRA)]

    [ https://issues.jboss.org/browse/JGRP-2023?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13185292#comment-13185292 ] 

Richard Janík commented on JGRP-2023:
-------------------------------------

I've managed to set up multicast on localhost on my machine by doing the following:
* add multicast flag to my localhost interface: {{sudo ifconfig lo multicast}}
* add a routing with a interface local address: {{sudo route -6 add ff01::/16 dev lo}}
* and use the interface local multicast address {{ff01::1}}
* I also had firewall turned off (fedora 22: {{sudo service firewalld stop}}) so it might be necessary to tune that as well

> Network unreachable with localhost addresses if -Djava.net.preferIPv4Stack=true isn't specified
> -----------------------------------------------------------------------------------------------
>
>                 Key: JGRP-2023
>                 URL: https://issues.jboss.org/browse/JGRP-2023
>             Project: JGroups
>          Issue Type: Bug
>    Affects Versions: 3.6.7, 3.6.8
>         Environment: $ java -version
> java version "1.8.0_45"
> Java(TM) SE Runtime Environment (build 1.8.0_45-b14)
> Java HotSpot(TM) 64-Bit Server VM (build 25.45-b02, mixed mode)
>            Reporter: Richard Janík
>            Assignee: Bela Ban
>
> When setting {{-bind_addr}} to localhost (either 127.0.0.1 or ::1) without specifying {{-Djava.net.preferIPv4Stack=true}}, JGroups fail to connect. The following errors are logged:
> {code}
> -------------------------------------------------------------------
> GMS: address=rjanik-24069, cluster=draw, physical address=0:0:0:0:0:0:0:1:37921
> -------------------------------------------------------------------
> Mar 03, 2016 11:41:12 AM org.jgroups.protocols.TP$BaseBundler sendSingleMessage
> SEVERE: JGRP000029: rjanik-24069: failed sending message to cluster (108 bytes): java.io.IOException: Network is unreachable, headers: PING: [type=GET_MBRS_REQ, cluster=draw], TP: [cluster_name=draw]
> ** View=[rjanik-24069|0] (1) [rjanik-24069]
> Mar 03, 2016 11:41:15 AM org.jgroups.protocols.TP$BaseBundler sendSingleMessage
> SEVERE: JGRP000029: rjanik-24069: failed sending message to cluster (56 bytes): java.io.IOException: Network is unreachable, headers: NAKACK2: [MSG, seqno=1], TP: [cluster_name=draw]
> {code}
> I'm not sure if there's some other configuration option that I forgot to add, but the example (in Steps to Reproduce) works with previous versions (3.6.6 for example), so I assume not.



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