[Serusers] Keep Alives? SO_KEEP_ALIVE? TCP Null packet?

[Jiri Kuthan]

You would have to send some keep-alives, perhaps dummy OPTION requests.
Even if your firewall would not drop active TCP connections, SER drops
them too -- drop time is subject to configuration and current TCP load.

Despite that I think that the first place to work on is your firewall
congiguration. Closing traffic to a server seems to me like a suboptimal
idea.

-jiri

At 08:57 AM 8/7/2004, Jamie Yukes wrote:
>Suggesting a shorter re-REGISTER interval would solve a problem that
>exists between the UA and the proxy....
>
>Our problem is between a proxy and another proxy.  We control one
>proxy and the other proxy is with the ITSP.  The TCP connection exists
>during a live call.  The other proxy sends TCP "null packet" keep
>alives every 15 seconds... however, our firewall does not apply them
>to the session activity timer on our outbound connection.  We would
>need to send TCP "null packet" keep alives to keep our firewall
>session activity timer from lapsing, and losing session control.
>
>Should I implement this via an external FIFO interface, that
>enumerates active call sessions every 15 seconds, and write a
>component that will send "null packet" on each connection?  Should I
>extend something like the tm module?
>
>Appreciatively,
>Jamie Yukes
>
>On Fri, 6 Aug 2004 22:53:30 -0500, Michael Shuler <mike at bwsys.net> wrote:
>> Make the client reregister on a short interval i.e. 60 seconds.  This works
>> quite well for us.
>> 
>> ----------------------------------------
>> 
>> Michael Shuler, C.E.O.
>> BitWise Systems, Inc.
>> 682 High Point Lane
>> East Peoria, IL 61611
>> Office: (217) 585-0357
>> Cell: (309) 657-6365
>> Fax: (309) 213-3500
>> E-Mail: mike at bwsys.net
>> Customer Service: (877) 976-0711
>> 
>> 
>> 
>> > -----Original Message-----
>> > From: serusers-bounces at lists.iptel.org
>> > [mailto:serusers-bounces at lists.iptel.org] On Behalf Of Jamie Yukes
>> > Sent: Friday, August 06, 2004 10:42 PM
>> > To: serusers at lists.iptel.org
>> > Subject: [Serusers] Keep Alives? SO_KEEP_ALIVE? TCP Null packet?
>> >
>> >
>> > I use TCP for my SIP connections.  I have noticed other proxy servers
>> > send TCP "null packet" keep-alives during a connection.  What is the
>> > feasibility of doing something like this in SER?  Where would you
>> > steer someone who would consider implementing?
>> >
>> > In particular this would solve a firewall issue related to "inactivity
>> > timeout".  (UAC and UAS don't support Session Timers)
>> >
>> > Jamie Yukes
>> > 
>> > _______________________________________________
>> > Serusers mailing list
>> > serusers at lists.iptel.org
>> > http://lists.iptel.org/mailman/listinfo/serusers
>> >
>> 
>> 
>
>Jamie Yukes
>Global Connect http://www.gc1.com/
>
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--
Jiri Kuthan            http://iptel.org/~jiri/