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From: Lowell Gilbert <freebsd-questions-local@be-well.ilk.org>
Date: 02 Dec 2003 17:30:01 -0500
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Subject: Re: getting DHCP-assigned IP address
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"Michael A. Smith" <msmith@code-fu.com> writes:

> Is there an easy way to get the IP address that DHCP has assigned to
> an interface?
> 
> I know I can do it the hard way -- parsing the results of ifconfig
> with regular expressions -- but I suspect there's a much easier way.

For most purposes, the easy way is to use the dhclient hooks scripts;
that way, you don't need to poll the values, either.  

"man 8 dhclient-script" for details, but my /etc/dhclient-exit-hooks
script is: 

    if [ x$old_ip_address != x$new_ip_address ]; then
            /usr/local/bin/noip
    fi