[jboss-jira] [JBoss JIRA] (JGRP-1403) JGroups diagnostics opens listening sockets on all interfaces on a multi-homed host

[Witold Wojciechowski (Commented) (JIRA)]

    [ https://issues.jboss.org/browse/JGRP-1403?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12651618#comment-12651618 ] 

Witold Wojciechowski commented on JGRP-1403:
--------------------------------------------

Bela, thanks for looking into this. Please keep in mind that we are running on an older version (2.8), which has been working fine for us for 2 years. We will consider moving to newer one, if it makes a difference, but are hesitant to do so as a matter of routine because of the ever present risk if destabilizing a system which behaves well in all other respects. This issue was discovered only recently during a process of network access audit. Our networking group tries to keep things pristine, and does not want to see minor but unexpected anomalies.
                
> JGroups diagnostics opens listening sockets on all interfaces on a multi-homed host
> -----------------------------------------------------------------------------------
>
>                 Key: JGRP-1403
>                 URL: https://issues.jboss.org/browse/JGRP-1403
>             Project: JGroups
>          Issue Type: Bug
>    Affects Versions: 2.8
>         Environment: Linux
>            Reporter: Witold Wojciechowski
>            Assignee: Bela Ban
>             Fix For: 3.1
>
>
> Netstat Linux utility reports that my application using JGroups opens sockets on all multicast-capable interfaces and subscribes to a multicast address specified for use by diagnostics (per documentation), despite explicit specification of the bind_addr property as Java system property. That is undocumented, and unexpected. (The setting of bind_addr has the expected effect for the regular, JGroups data sockets.)
> We tried to disable diagnostics altogether, by using the enable_diagnostics=false, but it makes no difference.
> We tried to set receive_on_all_interfaces=false, but it makes no difference,
> We also tried to set the the receive_interfaces=<our desired interface IP address> besides setting bind_addr, and it also makes no difference.
> Our application does not use the xml configuration file for the JGroups protocol stack, and we do it programmatically via setting appropriate Java system properties instead, before any JGroups functionality is invoked. This is done so, because the multicast addresses our application uses are not static (are determined at run time).
> I am not attaching any sample code, since any sample program when run on a multi-homed machine will reproduce the problem.
> Any comments on this behaviour would be greatly appreciated.

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