[SR-Users] tcp hangup

[Andrei Pelinescu-Onciul]

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