From: Travis Whitton <whitton@...>
Date: 2003-01-29T01:41:32+09:00
Subject: Re: Getting the dynamic IP address of a dialup interface (ppp0)

> I cannot do a reverse DNS
> lookup since the associated name is dynamic too 

You could always register with dyndns.org(it's free!) and have a
program like ddclient auto-refresh your DNS entry whenever you
connect to the net. That's what I'm doing with my DSL connection
at home, and I can retrieve my remote IP as easy as:

require 'socket'
ip_address = IPSocket.getaddress("myhost.dyndns.org")

Cheers,
Travis Whitton <whitton@atlantic.net>