[asterisk-users] IAX2 over OpenVPN connection.... working but

[Stephen Brown]

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So a friend of mine and I setup a static key based point to point
OpenVPN connection from my box to his for the express intent of carrying
IAX traffic encrypted.

His network on his lan is 172.30.1.0/24 and mine is 10.0.30.0/24. His
PBX is located at 172.30.1.48 and mine is at 10.0.30.2. We had an
existing working IAX trunk in place prior to the VPN, and after we
brought the VPN up we set the host= parameter within Asterisk
accordingly on each end to match the local IP's and discovered it did
not work. The trunk remained in an UNKNOWN status on each end, even
though we could ping each box locally, SSH, and even SIP worked.

Here's where I am baffled and I am hoping someone with intricate
knowledge of this implementation may be able to explain it to me. What
we had to do to get this working was to set the host= parameter to the
respective endpoint IP's of the VPN tunnel, 172.10.1.1 in my case, and
172.10.1.2 in his case. Calls flow normally now and we cannot understand
how or why. I would have assumed with a destination of either LAN as
defined by the routing table it would have left out on the OpenVPN
connection by default, and what's even more strange is that IAX is the
only protocol that does not appear to function as intended.

Any takers? :)


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