[jboss-jira] [JBoss JIRA] (JGRP-2343) Change in IPv4 versus IPv6 picking algorithm

[Bela Ban (Jira)]

    [ https://issues.jboss.org/browse/JGRP-2343?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13732579#comment-13732579 ] 

Bela Ban commented on JGRP-2343:
--------------------------------

I don't think we need to look at _all_ addresses; it is probably sufficient to configure {{bind_addr}} in the transport (UDP, TCP) and then determine the IP type for the rest of the addresses to be resolved (listed above) from it. 
E.g. if {{bind_addr}} is IPv6, {{UDP.mcast_addr}} will be the IPv6 default (if not set), or will be mapped to an IPv6-mapped IPv4 address (if set to an IPv4 address).

> Change in IPv4 versus IPv6 picking algorithm
> --------------------------------------------
>
>                 Key: JGRP-2343
>                 URL: https://issues.jboss.org/browse/JGRP-2343
>             Project: JGroups
>          Issue Type: Task
>            Reporter: Bela Ban
>            Assignee: Bela Ban
>            Priority: Major
>             Fix For: 4.1.0
>
>
> When https://issues.jboss.org/browse/JGRP-2305 was implemented, IPv4 was favored unless {{java.net.preferIPv6Addresses}} was set.
> However, this makes the following case fail: no {{java.net.preferXXX}} option is set and the configuration contains one or more IPv6 addresses, e.g. {{UDP bind_addr="::1"}}.
> This will fail, as the new algorithm sets the stack type as IPv4 (it works when {{java.net.preferIPv6Addresses}} is set).
> Change:
> * Look at all IP addresses in a configuration
> * If all addresses are IPv6 and the stack type is IPv4 (and IPv6 is available) -> switch to IPv6 as stack type
> * If all addresses are IPv4 and the stack type is IPv6 (and IPv4 is available) -> switch to IPv4 stack type



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