[Asterisk-Users] Asterisk, IAX and NAT issue

[Dan]

Hi Simon,

> Is your firewall redirecting incoming connections on n.n.n.n:5036 to
> the Internal Asterisk instance?  If you don't see any messages on the
> inside Asterisk box it's unlikely.
More than that... Asterisk is configured as DMZ in the NAT router, so it is
fully exposed to the internet.
More, from outside I can register a SIP phone to the internal Asterisk and
use it for placing calls.

>
> The best thing to do is probably do a tcpdump -n -i eth0 host n.n.n.n
> and host x.y.z.u (or similar) and try and diagnose what is actually
> being sent over the wire.

This is what I get on the internal PBX when trying to remotely connect using
IAX protocol, by dialing extension 103.

16:17:29.382604 193.221.214.29.5036 > 192.168.33.99.5036: udp 121 (DF) [tos
0x10]
16:17:29.395536 192.168.33.99.5036 > 193.221.214.29.5036: udp 12 (DF) [tos
0x10]
16:17:29.396791 192.168.33.99.5036 > 193.221.214.29.5036: udp 30 (DF) [tos
0x10]
16:17:29.682915 193.221.214.29.5036 > 192.168.33.99.5036: udp 12 (DF) [tos
0x10]

192.168.33.99 is the PBX behind NAT
1933.221.214.29 is the PBX directly connected to the Internet

so the packets goes to the right place, but then...nothing.

Dan