[Asterisk-Users] SIP behind NAT, workaround to make W Snel's very welcome fix work both for inside *and* outside clients

[Brian West]

Honestly I can't see all these NAT woes people speak of... I have * on a
public ip .. sip.conf entries with nat=yes load em up.. and they work.  So
I have yet to see why everyone has SO MANY problems.

bkw

On Tue, 28 Oct 2003, Christopher Stephens wrote:

> Hello everyone and welcome to my first post to the list!
>
> After studying for a couple of weeks, I finally built * for the first
> time last night, and of course had the same SIP-behind-NAT woes that
> plague all of us who use NATted connections.
> It was therefore with no small joy that I read the fix for that that
> Walter Snel proposed (q.v.:
> http://lists.digium.com/pipermail/asterisk-users/2003-October/024968.html).
> Since I currently have no zaptel hardware (though intend to get some
> within the week) and thus use soft (SIP) clients on the same internal
> network, the caveat that it would break internal SIP clients was, for me,
> a reason to not yet implement his fix. I was examining chan_sip.c, trying
> to think of a way to implement his 'Naturally it would be much better to
> make this behavior:', and while bemoaning my pathetic C skills, thought
> of another solution:
>
> -CUT HERE TO GET RIGHT TO THE POINT :P-
> 1) Somehow (I use dynamic DNS) get a FQDN to point to the IP of the
> outside of your NAT box;
> 2) Implement W Snel's hardcoding as in the above URL, using your chosen
> FQDN where, in his example, he has 213.84.4.39;
> 3) On any internal machine with a SIP client, add an entry to the hosts
> file that points your chosen FQDN to the * server's IP on the *internal*
> network.
>
> What do you all think?
> I won't have an opportunity to try to implement this until later this
> evening, but at that time will post a follow-up to let you know how it
> went.
>
> -Chris
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