NAT without Configuruing Router??

[Adrian Umpleby]

> The answer is NO, you cannot get through a router doing NAT without 
> doing a static NAT/PAT on the incoming port/IP address.

This is not strictly true.

What Jerry said earlier is well worth noting, since it contains a vital
clue how it might be possible:

>> NO, it is (usually) not possible to INITIATE
>> a TCP (nor UDP) connection from the out side of
>> the NAT router, with out some sort of help from
>> the router itself.

This is more correct because it uses the word "initiate".

In other words, if you want to get to your machine behind the NAT without
doing anything to the router, you must first create a way through from 
the
machine within the NAT.

This is accomplished quite easily if you have an ssh client on your 
machine
behind the NAT, and an ssh server on a machine outside the NAT. (And 
you'll
get the whole thing encrypted, too!)

I posted some info to this list fairly recently which would be well worth
reading:

http://www.realvnc.com/pipermail/vnc-list/2002-November/035727.html

Hope it's helpful!

Adrian

===============================================
Adrian Umpleby   adrian@ic.ac.uk
http://julia.ese.ic.ac.uk/adrian/
===============================================
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