[Asterisk-Users] SIP via Wireless Ethernet Bridge and Double NAT

Paul Rodan asterisk at glitch.cc
Mon Nov 1 09:05:45 MST 2004


That's what I was thinking, heh.

I was going to experiment with Firefly on my laptop. Plug it directly into
the WAP54G and see if I can get Firefly with Sip working. If I can, then the
Cisco should work. If it doesn't, I'll try to trade with a Sipura SPA-2000
at work or something. 


-----Original Message-----
From: asterisk-users-bounces at lists.digium.com
[mailto:asterisk-users-bounces at lists.digium.com] On Behalf Of Adam Greenbaum
Sent: Monday, November 01, 2004 10:54 AM
To: Asterisk Users Mailing List - Non-Commercial Discussion
Subject: Re: [Asterisk-Users] SIP via Wireless Ethernet Bridge and Double
NAT

On Mon, 2004-11-01 at 15:37, Paul Rodan wrote:
> I keep seeing sip registration failed requests on Asterisk. I checked
> and double checked the passwords, its fine. I believe it?s that the
> device gets the UDP packets through to the Asterisk server fine, with
> the authentication information or whatever; but when the Asterisk
> server tries to respond via UDP, it doesn?t make it through. So it
> fails.

I've seen this situation, it's probably slightly different to how you
describe, although has the same effect.

AFAIK when you send the register, the asterisk sends back a hash so you
can encode the password. If the client doesn't get the reply it will
just try again without the password. You need to see what's going on at
the ATA end of the network to see if the packets are coming back.

Can you tcpdump at any point along the way? If not then set the
'nprintf' host on your ATA and see if that sends any useful info about
what is happening. If you don't have the nprintf server software from
cisco then you can just use netcat:
 nc -l -u -p 9001

It sounds as though it'll take you more than 2 weeks to fix, might as
well wait for the SDSL ;)

Adam.

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