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From: Lowell Gilbert <freebsd-questions-local@be-well.no-ip.com>
Date: 04 Aug 2003 00:21:59 -0400
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Subject: Re: Finding your dynamic external IP
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"Bob Hall" <rjhjr@cox.net> writes:

> 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. 

And how do you decide when to run that?  
Having dhclient do it for you makes sure it happens right away on
every change, automatically...