[Asterisk-Users] stun and only one external ip

[Andres]

Thomas Kuepper wrote:

> hi,
>
> i want to use mystun because off nat problems by more than one device 
> behind one nat gw. i think it is the only solution to solve the nat 
> problem.
>
> what i do not understand is why needs the stun server two ip addresses?


It needs 2 IPs because the server will attempt to contact the phone from 
these 2 IPs.  If the phone responds from the 2 IPs it means that a 3rd 
IP (the phone you are calling) will also be able to communicate...hence 
do the whole NAT traversal thing.  If the second IP is unable to 
communicate it means the phone is behind a Symmetric NAT.

-- 
Andres
Network Admin
http://www.telesip.net