[SR-Users] tcp hangup

Andrei Pelinescu-Onciul andrei at iptel.org
Wed Jan 5 13:53:31 CET 2011


On Jan 05, 2011 at 13:47, Juha Heinanen <jh at tutpro.com> wrote:
> i have two sr proxies talking with each other over tcp.  one is running
> 3.0 and the other 3.1.  sometimes i notice that no sip requests or any
> other tcp packets get through from 3.0 sr host to 3.1 sr host.  netstat
> on 3.0 sr host shows that tcp connection to 3.1 sr host is in
> ESTABLISHED state whereas netstat on 3.1 sr shows that the same tcp
> connection is in FIN_WAIT1 state.  it takes several minutes before the
> hanging tcp connection is replaced by a new working one.  there is no ip
> level connectivity problem between the two sr hosts.
> 
> any suggestions on what might be going on?  is there some known bug in
> 3.0 tcp implementation that could explain this?

There is no known bug in 3.0 and even if it would be, the connection
should go automatically in close-wait on 3.0 (without the userspace
doing anything).

It looks like somehow the 3.0 does not receive the FIN (local firewall
rules?).

Andrei



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