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From: "Bob Hall" <rjhjr@cox.net>
Date: Mon, 4 Aug 2003 00:12:09 -0400
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Subject: Re: Finding your dynamic external IP
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On Sun, Aug 03, 2003 at 11:02:19PM -0400, Lowell Gilbert wrote:
> "David S. Jackson" <deepbsd@earthlink.net> writes:
> 
> > If your external IP number changes, as with DHCP, is there a way
> > to find out what it currently is?  I was thinking you could keep
> > BitchX logged into a chat channel and script a /dns yournick and
> > email yourself the results from time to time.   
> > 
> > How would you do it?
> 
> For DHCP specifically, the best thing to do is to use the
> dhclient-exit-hooks script to do whatever you want.  My particular
> example is attached...

I use
	ifconfig rl0 | grep "inet " | awk '{print $2}'
where rl0 is my external interface. 

Bob Hall