[asterisk-users] Lost outgoing SIP packets

[Roel van Meer]

Dovid Bender writes:

> The tcpdump that you are running is on the Asterisk box or via port  
> mirroring?

It's on the asterisk box itself.

I've already replaced the network card - no change.

Thanks,

Roel


> Regards,
>
> Dovid
>
> -----Original Message-----
> From: Roel van Meer <roel at 1afa.com>
> Sender: asterisk-users-bounces at lists.digium.comDate: Thu, 31 Mar 2016  
> 13:34:51
> To: <asterisk-users at lists.digium.com>
> Reply-To: Asterisk Users Mailing List - Non-Commercial Discussion
>  <asterisk-users at lists.digium.com>
> Subject: [asterisk-users] Lost outgoing SIP packets
>
> Hi list!
>
> I have a problem where SIP packets sent by Asterisk do not hit the wire, and
> I don't know what could cause this.
>
> I'm running Asterisk 1.8.28_cert5 with full SIP debug. At the same time, I'm
> doing a tcpdump of the traffic on the network interface. I can see in the SIP
> debug log that asterisk is sending packets. Most of the time, I can see
> those packets in the tcpdump, as you would expect.
> However, sometimes Asterisk sends a packet that *does not show up* in the
> tcpdump. Asterisk then does several retransmits (that also don't show up).
> The next packet that is not a retransmit does show up again.
>
> This causes Asterisk to log the peer it was sending packets to temporarily
> as Lagged or unreachable.
>
> There is no outgoing firewall on this box.
>
> Could anyone give me some pointers where to look?
>
> If Asterisk logs "VERBOSE[13019] chan_sip.c: Reliably Transmitting (NAT) to
> x.x.x.x:" you would expect to see that packet in a tcpdump trace, right?
> What could cause this not to be so? Are there network statistics I could
> look at? Is there a counter in /proc or /sys for problems with sending
> packets? Anything?
>
> If more information is necessary please do let me know.
>
> Thanks a lot in advance,
>
> Roel
>
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