On 7/31/2013 10:32 AM, Tony Mountifield wrote:
Most of my experience until recently has been in Asterisk 1.2, and I am
just starting to make use of Asterisk 11 for new systems.
I have a question about using SIP on a multi-homed machine.
I have a customer who wants an Asterisk box with two network interfaces:
one on the public Internet (no NAT), and one on a private LAN. The box
will not do any IP forwarding between interfaces. They want to connect
to a SIP trunk from an ITSP via the public interface, and to have SIP
phones on their LAN registered via the private interface.
I haven't tried such a setup before, so before creating a test system,
I wondered if anyone here has made such a setup, and whether there are
any issues with getting SDP contents and media routing correct?
Cheers
Tony
I built a setup like this a few years back. I believe the hurdle was
more for the OS than asterisk.
Let say the the two networks are 192.168.10.0/24 and 192.168.11.0/24
and the gateways are 192.168.10.1 and 192.168.11.1 respectively, and the
asterisk box server has the two interfaces as 192.168.10.11 and
192.168.11.11
from memory(warning: my memory is not what it used to be):
echo "1 TenNet" >> /etc/iproute2/rt_tables
echo "2 ElevenNet" >> /etc/iproute2/rt_tables
ip route add 192.168.10.0/24 dev eth0 src 192.168.10.11 table TenNet
ip route add 192.168.11.0/24 dev eth1 src 192.168.11.11 table ElevenNet
ip route add default via 192.168.10.1 dev eth0 table TenNet
ip route add default via 192.168.11.1 dev eth1 table ElevenNet
ip route show 2>&1 >> $logFile
ip rule add from 192.168.10.11/32 table TenNet
ip rule add from 192.168.11.11/32 table ElevenNet
ip rule add to 192.168.10.11/32 table TenNet
ip rule add to 192.168.11.11/32 table ElevenNet
All that the above does is ensure that traffic is routed out the correct
interface based on where it is headed. I.E. All traffic for
192.168.10.0/24 goes out eth0 all traffic for 192.168.11.0/24 goes out eth1
Then in asterisk I believe I add a localnet setting in sip.conf as
192.168.11.0, could be wrong on this though.
JohnM
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