getting IP address of router

[Peter L. Peres]

On Mon, 7 Feb 2005, Zbigniew Koziol wrote:

> Peter L. Peres wrote:
>> 
>>> Yes that is my problem. I am behind the NAT firewall.
>> 
>> 
>> In that case, I think that getting an account with one of the dynip 
>> providers would help.
>
> Heh, if there is possibility to get out at least: just ping me and call by 
> phone, and I will let you know what your IP is ;)
>
> Actually, better call first and after that try perhaps http ;)
>
> Not an automatic method but may work if I am at home ;)

I understand you are joking, but why ? dynip etc can 'detect' your new 
ip from a simple message sent to it from a new session and thereafter 
the entire internet can access 'him' by his proper name. What he is 
trying to do can be construed as being doing-reverse-dns-without-dns, 
and even if it will work, it will be a hack.

He does not say what he needs it for but if he needs it so much then the 
relevant data could be obtained from the router. A linux router can be 
set up to serve a web page (or finger etc) that dumps a nat table to 
anyone who requests it from the inside. If not a linux router, then the 
router software has an equivalent data page in its setup, via web 
interface, or telnet.

Why is is necessary to invent a new way to do this ?

Worse, if the nat firewall does 'internet connection sharing' then using 
certain services to/from the outside may have interesting consequences 
(what is the default policy for such a connection for an incoming 
request ?)

Peter
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