asterisk users - Mar 2006 - Multiple IAX clients behind a firewall

Hi all,
    I've searched the wiki, and my basic assumption at this point is to 
run multiple IAX clients behind NAT I need to specifically code each 
client to use a different port and then setup that port to be forwarded 
from the NAT router to their private IP address.

    At the moment, I can't seem to get more than one IAX client 
registered behind NAT... am I correct in my above assumption or have I 
missed something ?

-- 
Adrian Carter
Technical Manager
Leading Edge Internet

Web	  http://www.lei.net.au http://support.lei.net.au
Direct    +61 2 6163 6162  Support 1 300 662 415
E-mail    cartera@lei.net.au

>     At the moment, I can't seem to get more than one IAX client
> registered behind NAT... am I correct in my above assumption or have I
> missed something ?
I've used multiple hardware IAX phones behind NAT without a problem.

On 13 Mar 2006, at 05:54, Adrian Carter wrote:
> Hi all,
>    I've searched the wiki, and my basic assumption at this point is  
> to run multiple IAX clients behind NAT I need to specifically code  
> each client to use a different port and then setup that port to be  
> forwarded from the NAT router to their private IP address.
>
>    At the moment, I can't seem to get more than one IAX client  
> registered behind NAT... am I correct in my above assumption or  
> have I missed something ?
No, asterisk's iax treats the combination of apparent-ip-address and  
port as unique.
So in fact you do best to turn off any port forwarding. That way your  
NAT device will allocate
different ports for each client, sharing the same IP address.

This works because IAX re-registers (or qualifies) the connection  
every 60 seconds, which is enough
to keep the mapping in most NATing router's caches.


Tim Panton
tim@mexuar.com

In two cases we've had more than one IAX client work from behind the NAT. 

Recently however, behind a different NAT, there was a case where only one
client could connect. So maybe it depends on the router? I'm really hoping
that it will be able to connect in more cases than not and am looking
forward to seeing what others respond to this question.

Hagen
>Hi all,
>    I've searched the wiki, and my basic assumption at this point is to 
>run multiple IAX clients behind NAT I need to specifically code each 
>client to use a different port and then setup that port to be forwarded 
>from the NAT router to their private IP address.
>
>    At the moment, I can't seem to get more than one IAX client 
>registered behind NAT... am I correct in my above assumption or have I 
>missed something