Tom, I think pretty much everyone just forwards to their ISP's DNS server when they want that behavior.  Have you checked to see if your dhcp client allows you to run a script at each renew?  If so, you can probably just re-hup your DNS server or something to pull in the change. <div class="gmail_quote">On Sun, Nov 23, 2008 at 8:56 PM, Karl Schuttler <<a href="mailto:karl.schuttler@gmail.com">karl.schuttler@gmail.com</a>> wrote: <blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;"> You could always just cache DNS locally, or keep around some other DNS servers IP addresses commented for when times are rough (<a href="http://opendns.org" target="_blank">opendns.org</a> for instance). On Sun, Nov 23, 2008 at 6:41 PM, Tom Allison <<a href="mailto:tom@tacocat.net">tom@tacocat.net</a>> wrote: > This might sound dense, but I've a DNS/DHCP question that I'm just not sure > what the answer is. > > My firewall has a DHCP client connection to my ISP that gives me their > subnet and their DNS servers. > > This same box gives me the DHCP server and DNS information for my subnet. >  The DNS server uses forwarding to hit the ISP DNS server for lookups. > > I was burned once by the ISP changing their DNS server IP and Names. The DNS > configuration isn't built out from the DHCP connection, it's hard coded in > my dns configuration files. > > Is there some reasonable way to keep these two in sync? > Otherwise, is there some approach to semi-automate the identification and > correction?  I suppose I could always write a perl script to do this.  But I > can't imagine I'm the only one in the world to want to do this. > -- > ***  Sent from <a href="mailto:linux-users@lugwash.org">linux-users@lugwash.org</a>  ***  <a href="http://www.lugwash.org" target="_blank">http://www.lugwash.org</a> > to unsubscribe: `echo "unsubscribe" | mail <a href="mailto:linux-users-request@lugwash.org">linux-users-request@lugwash.org</a>` > _______________________________________________ linux-user mailing list <a href="mailto:linux-user@egr.msu.edu">linux-user@egr.msu.edu</a> <a href="http://mailman.egr.msu.edu/mailman/listinfo/linux-user" target="_blank">http://mailman.egr.msu.edu/mailman/listinfo/linux-user</a> </blockquote></div>