11 Feb
2011
11 Feb
'11
1:15 p.m.
Hi,
thanks for you response. Do you think that kamailio does send sip-options-ping within
TCP/TLS (instead of sending the dummy packets)?
Best regards,
Bernhard
-----Ursprüngliche Nachricht-----
Von: Klaus Darilion [mailto:klaus.mailinglists@pernau.at]
Gesendet: Freitag, 11. Februar 2011 12:30
An: Bernhard Suttner
Cc: sr-users(a)lists.sip-router.org
Betreff: Re: [SR-Users] NAT, TLS and location table
Am 11.02.2011 12:15, schrieb Bernhard Suttner:
Hi,
I am using TLS and recognize the following problem:
The TLS connection are build up successfully but the natping
(natping_interval = 10) does not send small dummy packets to the
phones. The phones are behind a firewall with NAT. Registered phones
with NAT but UDP do work correctly. They are getting the natping
every 10 seconds. After 120 seconds (should be the
tcp_connection_timeout) kamailio does send a FIN to the TLS phone to
close the TLS connection.
IIRC the keep-alive code in nathelper module sends CRLF only on UDP. IMO
it would be nice if it sends it also on TCP/TLS connections, at least as
a config option. Of course the code should also take care of not setting
up a new TCP connection if the old one is gone.
I once have seen a client which was confused by the CRLF and then closes
the TCP connection, so there might be other problems as well.
Of course the proper solution (IETF view) is that the clients sends
keep-alive (SIP outbound RFC).
Should I increase the tcp_connection_timeout to a
value bigger than
the registration timeout? I thought I do not need that, because of
the natping_interval. Is it maybe better to use a SIP-Options Ping
instead of the small dummy packets? I would prefer the dummy packets
because they are much smaller.
http://www.kamailio.org/dokuwiki/doku.php/install:1.5.x-to-3.0.0#tcp_connec…
http://www.kamailio.org/dokuwiki/doku.php/core-cookbook:3.1.x#tcp_keepalive
and
http://www.kamailio.org/dokuwiki/doku.php/core-cookbook:3.1.x#set_forward_n…
(to be used after lookup())
might be interesting too.
regards
klaus