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From: David Gilbert <dgilbert@velocet.ca>
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Date: Fri, 5 Jul 2002 08:31:08 -0400
To: Andrew J Caines <A.J.Caines@halplant.com>
Cc: FreeBSD-Questions <freebsd-questions@FreeBSD.ORG>
Subject: [FBSD-Q] Re: Dynamic DNS Client experiences?
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>>>>> "Andrew" == Andrew J Caines <Andrew> writes:

Andrew> # cd /usr/ports/net ; make search key=dynamic

I use dyndns.org.  It's the "ddup" port.  It works well, but I had to
write a little script (called form dhclient-exit-hook) to only call
ddup when the IP _changes_ (the aparently don't want to hear from you
if it doesn't).

Note that if you run ntpd, you have to kill it before running
dhclient.  I do this in /etc/rc.resume (for the internal ethernet) and
in /etc/pccard_ether for pccard devices.

#!/bin/bash
#
# Check for changes in the IP.

if [ "$reason" != "REBOOT" -a "$reason" != "BOUND" ]
then
	exit 0
fi

lastip=`cat /etc/lastip`

if [ "$new_ip_address" != "0.0.0.0" -a "$new_ip_address" != "$lastip" ]
then
	#echo $curip $lastip
	echo $new_ip_address >/etc/lastip
	/usr/local/sbin/ddup --host yourhost.homeip.net > /dev/null 2>&1
fi

if /bin/ps -ax | /usr/bin/grep -v grep | /usr/bin/grep -q ntpd
then
	:
else
	sleep 15
	/usr/bin/killall -9 ntpd
	/usr/sbin/ntpdate some.ntp.host
	/usr/sbin/ntpd -p /var/run/ntpd.pid
fi

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