--- At Mon, 14 May 2007 17:20:31 +0100, Mark Thomas wrote:
>Hi,
> Does can anybody shed any light on what particular NAT algorithm is used
>by the AEBS (maybe somebody from Apple ?), as I work in a SIP group for a
>large ISP, and there are problems with when using AEBS hardware and SIP
>adapters.
>
> (the ISP server doesn't use STUN servers, as the designer here didn't
>design architecture that way, and doesn't seem to want to add them when I
>mention it, because other routers work fine).
>
> But recently I have found incompatibility in the ISP routers which causes
>connection problems with iChatAV because the router was using symmetric NAT,
>and iChat seems to me relies on CONE NAT for its UDP punching technique
>(although could be wrong here).
>
> It would be useful to understand how which NAT algorithm is used, as I'm
>wondering if the problems on both AEBS hardware and ISP routers are caused
>by their respective NAT implementations.
While I can't really answer the question for you, you can test for the
type of NAT or at least get a good guess.
I used the stun code at <http://sourceforge.net/projects/stun/> for a
recent project. It includes the ability to determine the type of NAT
being used by testing various situations and common implementations of NATs.
By the way, I used this code with my AEBS and it generally worked just fine.
...Duane
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