[jboss-jira] [JBoss JIRA] Commented: (JGRP-951) Add in support for IPv6 to JGroups testsuite

[Richard Achmatowicz (JIRA)]

    [ https://jira.jboss.org/jira/browse/JGRP-951?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12460756#action_12460756 ] 

Richard Achmatowicz commented on JGRP-951:
------------------------------------------

My initial ideas were to do the following:
- in build.xml, to the ant macro runtests, add in system properties for both -Djava.net.preferIPv4Stack and -Djava.net.preferIPv6Addresses
- introduce an ant property jgroups.useIPv6 into build.properties which allows the user to indicate a preference for using IPv4 or IPv6 when running the testsuite
- include a check in build.xml which sets -Djava.net.preferIPv4Stack and -Djava.net.preferIPv6Addresses based on the value of jgroups.useIPv6:

    <!-- properties to determine IP version used -->
    <condition property="java.net.preferIPv4Stack" value="true" else="false">
      <isfalse value="${jgroups.useIPv6}"/>
    </condition>

    <condition property="java.net.preferIPv6Addresses" value="true" else="false">
      <istrue value="${jgroups.useIPv6}"/>
    </condition>

This seems ok, as these elements apply only to the JGroups testsuite, and would allow running tests against either set set of IPv4 addresses, or a set of IPv6 addresses, but not a mix of the two.

The other alternative is to allow setting independently the values of -Djava.net.preferIPv4Stack and -Djava.net.preferIPv6Addresses in build.properties, but this would only be needed for a mix of hosts.
 

> Add in support for IPv6 to JGroups testsuite
> --------------------------------------------
>
>                 Key: JGRP-951
>                 URL: https://jira.jboss.org/jira/browse/JGRP-951
>             Project: JGroups
>          Issue Type: Feature Request
>            Reporter: Richard Achmatowicz
>            Assignee: Richard Achmatowicz
>            Priority: Minor
>             Fix For: 2.4, 2.6, 2.7
>
>
> JGroups needs to support both IPv4 and IPv6. When running JGroups on a machine which has a dual IP stack, two system properties need to be set in order to specify preferences for one version of IP over the other:
> (excerpt from Sun notes) 
> 1. IPv6 stack is preferred by default, since on a dual-stack machine IPv6 socket can talk to both IPv4 and IPv6 peers.
> To change this, set -Djava.net.preferIPv4Stack=true  
> (NOTE: if we use java.net.preferIPv4Stack=true and use IPv6 addresses, we get a message  "exception while trying to create socket:java.net.SocketException: Protocol family unavailable")
> 2. By default, we would prefer IPv4 addresses over IPv6 addresses (i.e., when querying the name service (e.g., DNS service), we would return IPv4 addresses ahead of IPv6 addresses).
> There are two reasons for this choice:
>    1. There are some applications that expect an IPv4 address textual format, i.e. "%d.%d.%d.%d". Using an IPv4 address minimizes the surprises;
>    2. Using IPv4 address, we can use one call (with an IPv6 socket) to reach either a legacy IPv4-only service, or an IPv6 service (unless the IPv6 service is on a Ipv6 only node).
> To change this, set -Djava.net.preferIPv6Addresses=true 
> This issue concerns modifications to the JGroups testsuite to allow easy switching from IPv4 to IPv6 for testing purposes.
>  

-- 
This message is automatically generated by JIRA.
-
If you think it was sent incorrectly contact one of the administrators: https://jira.jboss.org/jira/secure/Administrators.jspa
-
For more information on JIRA, see: http://www.atlassian.com/software/jira