We have 2 servers: server1 server2 server1 and server2 are clustered so they both use the same DNS records. server1 hosts our company sites and server2 hosts our customer sites. However, server1 has both ns1 and ns2 pointing at it. So all requests are sent to server1 first, and if necessary routed to server2. The problem here is that if server1 is down, then all the sites on server2 will also be down. I know that it is possible to have ns1 on server1 and ns2 on server2, but I'm not sure how to go about setting it up. Can anyone point me in the right direction?