27 jun 2013 kl. 16:44 skrev Johan Wilfer <li...@jttech.se>: > 2013-06-27 16:08, Andrew Mortensen skrev: >> >> On Jun 27, 2013, at 9:50 AM, Johan Wilfer <li...@jttech.se> wrote: >> >>> Hi! >>> >>> I've the following setup: Teleco <-> Kamailio <-> Asterisk(s) >>> >>> The proxy has one public IP (say 1.2.3.4) and one private (10.0.0.1). >>> The asterisk-pbx:es has private adresses (10.0.0.2 in this example) >>> >>> I noticed that if I bind like this in kamilio.cfg >>> listen=tcp:1.2.3.4:5060 >>> listen=udp:1.2.3.4:5060 >>> listen=tcp:10.0.0.1:5060 >>> listen=udp:10.0.0.1:5060 >>> >>> Then if a call comes in from the Telco to Kamailio (1.2.3.4), kamailio >>> should forward the SIP-packet from it's private address (10.0.0.1) to >>> asterisk (10.0.0.2) >>> >>> However, the source address of the packets sent from Kamilio to Asterisk is >>> wrong - it uses the public ip. Like this (tcpdump output): >>> >>> 15:02:08.999642 IP 1.2.3.4.sip > 10.0.0.1.5060: SIP, length: 1346 >>> 15:02:09.474525 IP 1.2.3.4.sip > 10.0.0.1.5060: SIP, length: 1346 >>> 15:02:10.474524 IP 1.2.3.4.sip > 10.0.0.1.5060: SIP, length: 1346 >>> 15:02:12.474525 IP 1.2.3.4.sip > 10.0.0.1.5060: SIP, length: 1346 >>> >>> Obviously kamailio doesn't get any answers here. The packet goes out of the >>> right interface, but with the wrong src-address. >>> >>> However, if I remove the lines with "listen=" in kamailio.cfg to allow >>> kamilio to bind to all interfaces the src-address is correct and everything >>> works! >>> >>> (I've also done some tests with icmp and telnet and the src-addr seems >>> right in all these cases.) >>> >>> Is this a bug or am I missing something here? >> >> It sounds like what you want is force_send_socket: >> >> <http://www.kamailio.org/wiki/cookbooks/4.0.x/core#force_send_socket> >> >> andrew > > Hi Andrew, > Thanks for the tip! > > My kamailio get the routing from a database, and then rewrites the R-URI with > $ru = "sip: ...";. And then Kamailio resolve this domain and does all the > magic. :-) > > If I need to script a code-path for all these different cases I think the > best way for me is to remove the listen=...-directives. Because I just want > the src-address to be the "right" address (the same as the interface). Right > now kamailio uses the right interface for the destination, but uses the > source-ip of another interface. > > > Is there a reason Kamailio just pick one address (of random? the first?) of > all addresses when using "listen=", but can determine the right src-address > when no "listen="-lines are present? > > If this is a limitation with the listen-directive, I guess it's better to > bind to all (no listen=) and use iptables to block access to some of the > addresses, correct?
Have you enabled multihoming? http://www.kamailio.org/wiki/cookbooks/4.0.x/core#mhomed /O _______________________________________________ SIP Express Router (SER) and Kamailio (OpenSER) - sr-users mailing list sr-users@lists.sip-router.org http://lists.sip-router.org/cgi-bin/mailman/listinfo/sr-users
