6 May
2015
6 May
'15
4:43 p.m.
Hello,
do you have forwarding rules on your IP routing tables between the two
interfaces? Have you enabled the mhomed global parameter?
For UDP, the default rule is to use incoming socket for sending the
packets, unless mhomed is enabled.
For TCP is the kernel that has the final decision on the connection.
Note that you can also force a specific inteface with
force_send_socket() or $fs= "...".
Cheers,
Daniel
On 06/05/15 15:26, Grant Bagdasarian wrote:
Hello,
I have a Kamailio machine configured with two interfaces. One public,
one private.
Public Address: 10.10.10.10
Private Address: 192.168.1.10
Kamailio forwards the SIP packet to another local endpoint: 192.168.1.20
When a client sends a SIP packet using TCP to the public address of
Kamailio, Kamailio relays the packet using its private interface
(private address) to the other endpoint.
TCP: Client -> 10.10.10.10 -> 192.168.1.10 -> 192.18.1.20
When a client sends a SIP packet using UDP to the public address of
Kamailio, Kamailio (or the OS) relays the packet using its public
interface (public address) to the other endpoint.
UDP: Client -> 10.10.10.10 -> 10.10.10.10 -> 192.18.1.20
In the case of TCP, the source address is 192.168.1.10.
In the case of UDP, the source address is 10.10.10.10.
Everything is the same in the routing script for both UDP and TCP,
except in route[relay] (see below)
Is this normal? What is causing this, the OS or Kamailio?
Route[RELAY] {
…
if($pr =~ "TCP") {
if (!t_relay_to_tcp()) {
sl_reply_error();
}
} else {
if (!t_relay_to_udp()) {
sl_reply_error();
}
}
}
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--
Daniel-Constantin Mierla
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