[sip-comm-issues] [Issue 751] New - Connection problem to IPv4 SIP providers on Linux

damencho at dev.java.net damencho at dev.java.net
Thu Jan 7 12:01:53 CET 2010


https://sip-communicator.dev.java.net/issues/show_bug.cgi?id=751
                 Issue #|751
                 Summary|Connection problem to IPv4 SIP providers on Linux
               Component|sip-communicator
                 Version|current
                Platform|All
              OS/Version|Linux
                     URL|
                  Status|NEW
       Status whiteboard|
                Keywords|
              Resolution|
              Issue type|DEFECT
                Priority|P5
            Subcomponent|development
             Assigned to|issues at sip-communicator
             Reported by|damencho






------- Additional comments from damencho at dev.java.net Thu Jan  7 11:01:52 +0000 2010 -------
Reported by Sebastien Vincent :

Unable to connect to any IPv4 SIP providers as well as IPv4 SIP peers. My
network was configured correctly and the peers and providers reply to the ICMP
echo request. Connections to IPv6 providers and peers works good (for all my
work I use only IPv6).

It is due to the introduction of bindv6only=1 by default in GNU/Linux Debian
Squeeze. You could check it at /proc/sys/net/ipv6/bindv6only and
/etc/sysctl.d/bindv6only.conf. See
http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=560044. One solution proposed
in the bugreport is to add java.net.preferIPv4Stack=true but it does not work in
SC. Setting bindv6only to 0 (echo 0 > /proc/sys/net/ipv6/bindv6only or set 0 in
/etc/sysctl.d/bindv6only.conf file) solve the problem.

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