New subject: sr-users Digest, Vol 81, Issue 7

3 Feb 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@lists.sip-router.org wrote:
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Today's Topics:

TCP keepalive on server and client (Yufei Tao)

Message: 1
Date: Fri, 3 Feb 2012 10:33:11 +0000
From: Yufei Tao yufei.tao@redembedded.com
Subject: [SR-Users] TCP keepalive on server and client
To: sr-users@lists.sip-router.org
Message-ID: 4F2BB7E7.2090601@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:

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?

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