Re: REVIEW NEEDED: draft-durand-v6ops-assisted-tunneling-requirements-00.txt

[Florent Parent <Florent.Parent@hexago.com>]

-- On Wednesday, May 05, 2004 16:59:32 +0200, Jeroen Massar wrote:

> To rephrase:
>
> The configuration protocol can easily see if it is a NAT or not.
>
> Clients MAY request ANY, UDP or Proto-41 as encaps.
>
> When the encaps is ANY the client sends the IP it think it has globally
> to the configuration server, which compares it with the actual
> connection origin, different -> NAT -> use UDP. Otherwise it can safely
> assume proto-41.
>
> Additionally:
>
> Clients MAY also check if they have an RFC1918 address, they then also
> know that they are behind a NAT.

In fact, I would not make any assumptions about the IPv4 addresses. This 
service could be offered inside a large privately-addresses network, where 
both the clients and server are using rfc1918 addresses, therefore no NAT 
in the path. IMHO, its best to let the server do the detection of whether 
an address translation occured.

Florent