DNS Failover

[Anthony Wilkins]

Hi, is there anybody who can help me in finding a solution to a problem 
I have?

My web server is sometime temporarily down and I want people to go to my 
remote site where I have a backup web server. Can I change DNS on the 
Internet fast enough for incoming requests to be handled by my redundant 
web server? Normally I don’t want traffic to go to the remote site.

Thanks, Anthony W.