Gotcha, if I sort wireshark by source freeswitch sends 2 RTP packets and then a handful if ICMP errors, this pattern repeats for the entire call (2 voice packets and 5+ icmp errors).  

192.168.24.22 = freeswitch
192.168.21.4 = endpoint

ID    Time           Source               Src Port   Destination      Dest Port 
12    0.186121    192.168.24.22    27176    192.168.21.4    16752    RTP    PT=ITU-T G.711 PCMU, SSRC=0x33CF6C8, Seq=5202, Time=240, Mark
13    0.186126    192.168.24.22    27176    192.168.21.4    16752    RTP    PT=ITU-T G.711 PCMU, SSRC=0x33CF6C8, Seq=5202, Time=240, Mark
57    1.477101    192.168.24.22    16752    192.168.21.4    27176    ICMP    Destination unreachable (Port unreachable)
92    2.467948    192.168.24.22    16752    192.168.21.4    27176    ICMP    Destination unreachable (Port unreachable)
93    2.467949    192.168.24.22    16752    192.168.21.4    27176    ICMP    Destination unreachable (Port unreachable)
194    5.465388    192.168.24.22    16752    192.168.21.4    27176    ICMP    Destination unreachable (Port unreachable)


The ICMP erros have the ports reversed, is this normal ?

Thanks,
Dan-

---

From: "Brian West" <brian@freeswitch.org>
To: "FreeSWITCH Users Help" <freeswitch-users@lists.freeswitch.org>
Sent: Wednesday, July 21, 2010 8:30:40 AM
Subject: Re: [Freeswitch-users] calls ending with MEDIA_TIMEOUT

NO that would mean that it was sending RTP to that IP and the firewall returned and ICMP port unreachable.

/b

On Jul 21, 2010, at 8:43 AM, Dan wrote:

> I was able to pull the box out yesterday and try some load testing under tcpdump.  It looks like under load freeswitch was trying to ping the far end RTP port which was failing:
>
> 57    1.477101    192.168.24.22    192.168.21.4    ICMP    Destination unreachable (Port unreachable)
>
> I'm guessing this is part of auto nat detection?  Is this a tunable option?    I don't need stun/nat functionality at this point so I'm running freeswitch with the -nonat  flag right now to see if its playing a part here.  
>
> I have the tcpdump of a call if anyone is interested.
>
> Thanks
> Dan-


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