I had this problem at work and it took me awhile to figure it out. What happened was that one of my computers was set to obtain IP automatically through the DHCP server, and within that DHCP I could configure the DNS servers. So no matter how many times I told Ubuntu what the DNS should be, it kept pulling the IP from the DHCP server, which then kept assigning it its own DNS server. I finally went into the DHCP server and changed the DNS server to what I wanted. That fixed my problem.
So in a nutshell, I believe you. Your DSL is pushing out the IP address AND the DNS, which Fedora Core 6 is picking up. No matter how many times you change the DNS, Fedora Core 6 will always use the DNS assigned by the DHCP server (your DSL provider) for as long as you are obtaining the IP address from it. Set your FC6 to a static IP or get a router or something.
Last edited by Micro420; 11-22-2006 at 02:34 AM.