[Asterisk-Users] Asterisk, IAX and NAT issue

[Dan]

Hi Simon,

It is solved now.... It was a problem at the ISP level..... some UDP packets
filtered..


Thanks,
Dan

----- Original Message ----- 
From: "Simon J Mudd" <sjmudd at pobox.com>
To: <asterisk-users at lists.digium.com>
Sent: Friday, June 27, 2003 6:34 PM
Subject: Re: [Asterisk-Users] Asterisk, IAX and NAT issue


> Hi Dan,
>
> dtoma at fx.ro ("Dan") writes:
>
> > > 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.
>
> I guess you therefore need to check with netstat -ln | grep udp to
> check that there is actually something listening on port 5036.  I
> don't remember now whether you said if your machine is multihomed
> or not, or whether you have any ip filters enabled. Perhaps you are
> filtering incoming traffic or something like that.
>
> Sorry I don't have any other suggestions.
>
> Simon
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