[asterisk-users] Asterisk behind Multi-NAT question

[Steve Totaro]

Anselm Martin Hoffmeister wrote:
> Am Dienstag, den 09.10.2007, 19:50 +0100 schrieb WipeOut:
>> Hi,
>>
>> Ok.. I know dual NAT is a problem for SIP..
>> ie. UA - NAT - Internet - NAT - Asterisk
>>
>> What about Multi-NAT where a dedicated public IP is mapped to the 
>> private IP of the asterisk box..
>> ie UA - NAT - Internet - Multi-NAT - Asterisk
>>
>> http://www.draytek.co.uk/support/kb_vigor_multinat.html
>>
>> Anyone tried it?
> 
> My experience with SIP, Asterisk and more than one NAT in the path is
> not a good one. For example, several of my SIP hardphones refused to
> work behind a dual-NAT
> 
> Phone (10.10.0.201) - NAT - internal net (192.168.174.0/24) - NAT -
> Internet - Asterisk
> 
> where everything else worked as usual. Admittedly multiple NATs are not
> necessarily a good idea to have, but that was a customer's network, not
> mine ;-)
> 
> Also quite regular setups like
> 
> Phone - NAT - Internet - NAT - Asterisk
> 
> and
> 
> 2 Phones - NAT - Internet - Asterisk without NAT
> (One of those phones calling the other).
> 
> might work - or just be a source of trouble. This also seems to depend
> on the cooperation of the NAT device; some work better than others.
> 
> IAX seems to handle NAT issues much better, in my experience, but I did
> never have an IAX hardphone.
> 
> BR
> Anselm


For a small investment of time and money, you can setup OpenVPN and have 
your own network with no NAT issues whatsoever.  That would be my first 
choice over IAX.

Thanks,
Steve