Multi-master

[M. Yu]

> When site A goes completely in the dark, we change the IP of "webserverA"
to
> an IP within the range of siteB.
> If TTL is expired the domains will resolve to the IP of siteB (where there
> is a copy of webserverA).

Are there any reasons why you can't just put the 2 IPs on your web server
instead of having to keep changing it?  You could also do Round Robin DNS on
it although that would probably give you 50% connectivity.

HTH,

M. Yu