I have 2 internet connections one is much slower than the other and I wish to have the second one as a failover for my webservers. I have 2 dns servers both pointed to the first connection. I was figuring that if i set up a third dns server on the second network, it could point everyone to the webservers through the slower connection. Since dns server 1 and 2 are only accessable through the first internet connection, if that line goes down, i was thinking that it would try the third dns server and it would work because it is on the second connection. It would then point everyone to use that network.
What I would like to know is, does it work that way, or does it work in a round robin fashion? I dont want people to be hitting the third dns server unless the first line is down due to the fact that the first line is a DS3 and the second is a slow t-1.