[SR-Users] sr-users Digest, Vol 81, Issue 7

Yufei Tao yufei.tao at redembedded.com
Fri Feb 3 12:06:13 CET 2012


Hi

I think I got the tcp_crlf_ping and the tcp_keepalive parameters mixed up.

So for tcp_crlf_ping, Kamailio will only respond. While for
tcp_keepalive parameters, if enabled on both server and client, both
will be sending the keepalives, and the receiver will respond.

In order to use tcp_crlf_ping, client's app level rather than TCP level
would have to send the crlfcrlf (pings) and process the crlf (pongs) in
order to detect if Kamailio is up. Is this right?

Yufei

On 03/02/12 11:00, sr-users-request at lists.sip-router.org wrote:
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>    1. TCP keepalive on server and client (Yufei Tao)
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> ----------------------------------------------------------------------
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> Message: 1
> Date: Fri, 3 Feb 2012 10:33:11 +0000
> From: Yufei Tao <yufei.tao at redembedded.com>
> Subject: [SR-Users] TCP keepalive on server and client
> To: <sr-users at lists.sip-router.org>
> Message-ID: <4F2BB7E7.2090601 at redembedded.com>
> Content-Type: text/plain; charset="ISO-8859-1"
>
> Hi
>
> I want to use TCP keepalive to detect dead connections between Kamailio
> and my SIP clients. I've got some questions about this:
>
> 1. If I enable it on Kamailio by setting for example:
>
> tcp_crlf_ping = yes
> tcp_keepalive = yes
> tcp_keepidle = 60
> tcp_keepintvl = 10
> tcp_keepcnt = 3
>
> >From what I read by gooling, that means Kamailio only responds to the
> crlfcrlf sent by the client, but can't be configured to send the
> crlfcrlf. Is this right?
>
> 2. On my client, if I use setsockopt to set the corresponding values:
>
>   SO_KEEPALIVE
>   TCP_KEEPCNT
>   TCP_KEEPIDLE
>   TCP_KEEPINTVL
>
> would it make the client send crlfcrlf?
>
> The reason I'm confused is, with these settings, if Kamailio can only
> respond to crlfcrlf, but not send, then would the client only respond
> too, as in 1. and 2., they seem to configure the same set of parameters?
> Please help me clarify this. Thanks very much!
>
> Yufei
>
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> Yufei Tao
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Yufei Tao
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