Date: Wed, 7 Feb 2001 00:04:34 -0500 From: "John Telford" <j.telford@sympatico.ca> To: <freebsd-questions@FreeBSD.ORG> Subject: Have my offsite boxes e-mail me their IP address when it changes ? Message-ID: <002c01c090c3$7715e540$022ce540@johnny2k>
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I have to support a remote Freebsd 4.2-R box that is attached via PPPoE.
From time to time it will automatically obtain a new IP address. I'd like
that new address to be e-mailed me to me by the system when it does change.
I have the startup part figured out, in rc.local I just put:
ifconfig tun0 |mail myaddress@mydomain.com
Seems to work fine.
I'm sure someone must have a script that can test and mail if it changes.
My (newbie) thoughts would be to first write ifconfig tun0 to file1 and
file2 at startup then cron a job that would:
ifconfig tun0 > file2
diff file1 file2
if there are differences then ifconfig tun0 |mail myaddress@mydomain.com
cp file2 file1 #make them the same again.
else
no changes
done.
Anyone actually have something working ?
Thanks in advance, John.
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