[dccp] Re: RFC - DCCP and NAT

["David S. Miller" <davem at davemloft.net>]

From: Ian McDonald <imcdnzl at gmail.com>
Date: Fri, 9 Sep 2005 09:58:48 +1200

> What I propose is that we create a couple of new options to say that I
> am transmitting from a NAT box (let's call this Notify NAT) and also
> for the other end to relay back what your public IP address is (let's
> call this NAT to Public). The Notify NAT option would include it's
> private IP address.

That NAT box could be several hops away and totally unknown
to you, therefore I really don't see this as a workable
solution.

NAT without protocol knowledge is simply impossible without
giving up checksums and thus data integrity.