Re: knowing my IP address behind NAT firewall

[Roel Schroeven <rschroev_nospam_ml@fastmail.fm>]

dexter2 wrote:
> Hi,
> i'm connected to internet via DSL line. I have DSL modem with 4 eth
> ports. DSL modem serve also as NAT firewall.
> Each time i connect to internet, i have diferent IP, that my ISP assign
> to me. If i want to know my IP, that i use on internet, I have to
> connect to DSL modem via HTTP and read it there. 
> Is there a unix command, that will get my internet IP? How does this
> command get this IP?
> It must be posible, becouse Valknut is able to get my actual internet
> IP.

ddclient is able to read the address via HTML from many kinds of 
routers; is just fetches the page and finds the IP address with a 
regular expression, I guess.

I find that with my setup checking up on http://checkip.dyndns.org works 
better. I suspect Valknut uses a similar approach.

--
If I have been able to see further, it was only because I stood
on the shoulders of giants.  -- Isaac Newton

Roel Schroeven