27 Jun
2013
27 Jun
'13
3:50 p.m.
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?
--
Johan Wilfer
27 Jun
27 Jun
4:08 p.m.
On Jun 27, 2013, at 9:50 AM, Johan Wilfer <lists(a)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
4:44 p.m.
New subject: Wrong src-adress in packets sent from Kamailio when using listen=
2013-06-27 16:08, Andrew Mortensen skrev:
On Jun 27, 2013, at 9:50 AM, Johan Wilfer <lists(a)jttech.se> wrote:
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?
--
Johan Wilfer
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 
4:53 p.m.
27 jun 2013 kl. 16:44 skrev Johan Wilfer <lists(a)jttech.se>se>:
2013-06-27 16:08, Andrew Mortensen skrev:
Have you enabled multihoming?
http://www.kamailio.org/wiki/cookbooks/4.0.x/core#mhomed
/O
On Jun 27, 2013, at 9:50 AM, Johan Wilfer <lists(a)jttech.se> wrote:
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? 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
5:04 p.m.
New subject: Wrong src-adress in packets sent from Kamailio when using listen=
2013-06-27 16:53, Olle E. Johansson skrev:
27 jun 2013 kl. 16:44 skrev Johan Wilfer <lists(a)jttech.se>se>:
Olle, you are the king. Thank you!
With mhomed=1 it works with the listen-directives.
Greetings from Västkusten :-)
--
Johan Wilfer
2013-06-27 16:08, Andrew Mortensen skrev:
Have you enabled multihoming?
http://www.kamailio.org/wiki/cookbooks/4.0.x/core#mhomed
On Jun 27, 2013, at 9:50 AM, Johan Wilfer <lists(a)jttech.se> wrote:
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? 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
5:06 p.m.
27 jun 2013 kl. 17:04 skrev Johan Wilfer <lists(a)jttech.se>se>:
You are welcome!
Have you
enabled multihoming?
http://www.kamailio.org/wiki/cookbooks/4.0.x/core#mhomed
Olle, you are the king. Thank you!
With mhomed=1 it works with the listen-directives.
Great!
Greetings from Västkusten :-)
Greetings from Sollentuna!
/O
3978
days inactive
3978
days old
5 comments
3 participants
participants (3)
-
Andrew Mortensen -
Johan Wilfer -
Olle E. Johansson