[cisco-voip] TCP ZeroWindow

[Wes Sisk]

If you see 0 window you must be looking at packet capture.

In the IP TTL for the 0 window packets, are the TTL consistent with 
other frames in the stream?  This would confirm the 0 window is coming 
from CM and not some interim device such as a firewall or inspection device.

Beyond that the only reason I have seen 0 window from CM is byproduct of 
a memory leak on the CM server.  Do you see indication of increased 
VMRss or file descriptors on CM when this happens?

/Wes

On Friday, May 21, 2010 11:19:45 AM, Mauro Celli 
<mauro.celli at 2000net.it> wrote:
>
> Hi,
>
> my remote cucm 6.1 ,sometimes send a TCP ZeroWindow packet and my 
> phone stop responding for some times (30sec or 30mins) reboot and 
> reconnect.
>
> If i check "remote device" in phone configuration no TCP ZeroWindow 
> appear and phone work well.
>
> From another site all is ok.
>
> I have checked my line with download,flood etc.. and it's ok, no lost 
> packet...
>
> Why?
>
> Thans
>
>  
>
> Cordiali saluti
>
> *Mauro Celli* (work in progress...)
>
> *Site:* www.2000net.it <http://www.2000net.it/>
>
> 13011 Borgosesia (VC) Italy
>
> Via XXV Aprile,41
>
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>
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>
> Supporto tecnico: 0163 .209561
>
> *Email:* mauro.celli at 2000net.it <mailto:mauro.celli at 2000net.it>
>
> cid:image001.gif at 01CA32BF.F85A72E0
>
>  
>
>  
>
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