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(a)lists.sip-router.org wrote:
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 Today's Topics:

    1. TCP keepalive on server and client (Yufei Tao)

 ----------------------------------------------------------------------

 Message: 1
 Date: Fri, 3 Feb 2012 10:33:11 +0000
 From: Yufei Tao &lt;yufei.tao(a)redembedded.com&gt;
 Subject: [SR-Users] TCP keepalive on server and client
 To: &lt;sr-users(a)lists.sip-router.org&gt;
 Message-ID: &lt;4F2BB7E7.2090601(a)redembedded.com&gt;
 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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Re: [SR-Users] sr-users Digest, Vol 81, Issue 7