[SR-Users] tcp hangup

[Jiri Kuthan]

Hi Juha,

have the TCP keepalives addressed the problem? If not, could you send
a PCAP? (ideally from both upstream and downstream perspective)

Thanks!

-jiri

On 1/10/11 11:32 AM, Andrei Pelinescu-Onciul wrote:
> On Jan 09, 2011 at 21:41, Juha Heinanen<jh at tutpro.com>  wrote:
>> Andrei Pelinescu-Onciul writes:
>>
>>> However you could enable tcp level keepalives and on linux you can tune
>>> the intervals, e.g.:
>>>
>>> tcp_keepalive = yes
>>> tcp_keepidle = 60
>>> tcp_keepintvl = 10
>>> tcp_keepcnt = 3
>>
>> andrei,
>>
>> my linux 2.6.32 kernel has these tcp keepalive variables:
>>
>> tcp_keepalive_intvl   tcp_keepalive_probes  tcp_keepalive_time
>>
>> linux tcp keepalive doc says:
>>
>> Remember that keepalive support, even if configured in the kernel, is
>> not the default behavior in Linux. Programs must request keepalive
>> control for their sockets using the setsockopt interface. There are
>> relatively few programs implementing keepalive, but you can easily add
>> keepalive support for most of them following the instructions explained
>> later in this document.
>>
>> question: does sr request that tcp keepalive is turned on on its tcp
>> connections or via a function call on a particular connection?
>
> It uses setsockopt (if tcp_keepalive = yes is present in the .cfg).
>
> You don't have to change any kernel variables in proc for sr. You just
> need to enable keepalives and set the intervals in the .cfg file
> (the above example could be pasted directly in a ser.cfg).
>
> Andrei
>
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