[NBLUG/talk] Redundant DNS

[Walter Hansen]

Here's the potential situation. I have a web server with two different
routed internet connections. The IPs are X.X.X.X and Y.Y.Y.Y. I want
people on the internet to reach my web server regardless of which
connection is up or down. I know I can put something like:

web.me.com   IN   A    X.X.X.X
             IN   A    Y.Y.Y.Y

in the Zone file and it will round robin between the two address, somewhat
ballancing the load, but what if the X.X.X.X connection goes down. Won't
every other request fail?

I have the O'Reilly DNS and BIND book 4ed but haven't found a reference to
how to set this up. The connections are both broadband and feature static
IP addresses.

I'd also like to possibly have a third address Z.Z.Z.Z, but it would be a
dynamic address (although I've heard that dynamic DNS is possible) and a
slow 56k connection and should not be used unless both X.X.X.X and Y.Y.Y.Y
fail.

Does anyone know what I'm talking about? Anyone set up something like
this? I have basic access to the Zone file, but I can't configure the DNS
server.

If this sort of thing is possible can I also tune the connections so that
say 70% of the queries return one path and 30% return the other?

Are you all sick of my questions?



                     -Walter