VoIP behind NAT and FreeBSD

Garrett Cooper youshi10 at u.washington.edu
Sat Dec 2 13:34:02 PST 2006

Kurt Dethier wrote:
> Derrick Edwards wrote:
>> On Saturday 02 December 2006 09:22, Joe Holden wrote:
>>> Kurt Dethier wrote:
>>>> STUN will only work if you have the correct NAT implementation on
>>>> your gateway. If you are using pf, you get what the STUN RFC calls
>>>> a symmetric NAT. STUN will not help you in such an implementation.
>>>> I'm not sure how the other NAT solutions on FreeBSD are implemented.
>>>> If you need a solution for a symmetric NAT, you need something that
>>>> understands the signaling protocol and can add fw/nat rules on demand
>>>> on your gateway, or a media proxy (like TURN).
>>>> Kurt
>  >>
>>> It is entirely possible to use voip behnd symmetric nat, but it also
>>> entirely depends on the setup, some more details will help.
>>     Hi, I am not sure of your setup either, but I have Vongae working 
>> behind a FreeBSD Firewall/Router using PF with NAT. 
> Hi all,
> It is very possible to use VOIP behind a symmetric NAT, but STUN is not
> going to be any help. Depending on the setup and clients I have
> implemented a number of solutions over the past years.
> Unfortunately I haven't found a single solutions that always works.
> Kurt

Forgive me if I'm not understanding the issue properly, but don't you 
have port-forwarding setup on the FreeBSD box for the machine that you 
are trying to use VoIP with? It seems like the problem would *sort* or 
be that simple to solve, unless the VoIP setup uses a P2P type 
configuration where it picks multiple ports for listening and 
transferring data.

Maybe it's just my misunderstanding of VoIP..

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