VoIP behind NAT and FreeBSD
joe at joeholden.co.uk
Sat Dec 2 06:22:23 PST 2006
Kurt Dethier wrote:
> Marwan Sultan wrote:
>> Hello All,
>> Well, maybe the subject says all,
>> Im running 6.1R acting as NAT, gateway ofcourse, hotspot.
>> I have many clients trying to use Vonage, motorola, VoIP devices and
>> and few more products.
>> The problem is as its described in some websites..
>> They can call, receive a call, hear the dailtone but no one can hear
>> the other party.
>> After researching i found out there is a problem iusing FreeBSD NAT
>> with voip protocols.
>> i have been advised to use STUN servers, (Simple Traversal of UDP
>> through NATs.)
>> I found out there is net/stund port and its installed successufly!
>> but still lost.
>> Can someone kindly and please shade a light on howto
>> make voip behind NAT works in my FreeBSD ? im in trouble because of
> Hi Marwan,
> 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).
It is entirely possible to use voip behnd symmetric nat, but it also
entirely depends on the setup, some more details will help.
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