[Kamailio-Users] TCP ZeroWindow and TCP Window Full

[Klaus Darilion]

Usually TCP ZeroWindow means, that the TCP receive buffer is full, which 
usually means that Kamailio stopped reading from the TCP socket.

I never had this problem yet. You could start grepping the code for this 
error message to find out what happened.

regards
klaus

Gawith schrieb:
> There's not that much traffic. Perhaps 200 TCP packets per second.
> Kamailio starts with the ZeroWindow.
> 
> I also see single "core:handle_io: empty fd map" in the logs and after 
> that Kamailio sends a TCP RST packet.
> 
> I have no clue how to debug this.
> 
> 
> 
> Klaus Darilion schrieb:
>> Do you have heavy traffic?
>>
>> Who is announcing ZeroWindow? Kamailio or the peer?
>>
>> regards
>> klaus
>>
>> Gawith schrieb:
>>> Hi,
>>>
>>> I see enormous TCP problems on my systems.
>>> All of a sudden, a perfectly working TCP session uses ZeroWindow
>>> packets, later I see TCP Full Window packets and finally the peer resets
>>> the connection.
>>> In the logs I see a lot of "core:handle_io: empty fd map" messages.
>>>
>>> Has anyone experienced similar problems?
>>>
>>> Regards.
>>>
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