Friday, December 23, 2005

DNS and the ActionTec Modem

he dhclient3 client runs /etc/dhcp3/dhclient-script can be extended by simply creating your own scripts under /etc/dhcp3/dhclient-*-hooks.d/. Check out the man pages for dhclient-script ($ man 8 dhclient-script) and read the HOOKS section.

What I did was just dropped the following script in as an exit hook, so it is executed after the /etc/resolv.conf is updated.

All this hack does is strip out the crap that really doesn't work anyways.

$ cat /etc/dhcp3/dhclient-exit-hooks.d/check_actiontec_dns
echo `date`: checking dns ordering for actiontec woes
grep ${BAD_IP} /etc/resolv.conf > /dev/null
if [ $? == 0 ]; then
echo removing actiontec dns entry
grep -v ${BAD_IP} /etc/resolv.conf > /tmp/resolv.conf
mv /tmp/resolv.conf /etc/resolv.conf

One thing that may break for you is if you go to another wifi access point that is NOT actiontec and it only has a single dns entry. If it did, then you'd end up with an empty /etc/resolv.conf file! Just use this script as a base....

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