how to run script after adsl-start

From: 0 (stacko23_at_my-deja.com)
Date: 07/29/03 

Date: 29 Jul 2003 02:32:14 -0700

Hi NG!
I'd like to run a firewall script after the adsl-start script from the
rp-pppoe package. adsl-start monitors the dsl connection, and
reconnects if the connection was lost, thus changing my ip. I would
then need to run the firewall script again. How can I do it?
Thanks
Bernd Haller