One domain with two sites! is that possible?

a site and its mirror site.. while one is down the other is up..

[Toldo]

hi,
i d like 2 ask if i can make 4 dns for 1 domain..
example:
ns1.domain.com
ns1.anotherdomain.com
ns2.domain.com
ns2.anotherdomain.com

if i have 2 hosting accounts with the same contents..
if the 1st hosting is down for anyreason.. the other will work.. is that right?

if that is wrong.. how could i make a mirror to my site to be ready when the 1st down is down for any reason..

[dataguy]

What you want to do is possible, but not the way you are describing. As you have described it, you have a backup DNS server, not a backup website.

What you need is to have a DNS service that detects if the primary server is down, and if it is, then direct traffic to the second server.

I have seen this type of DNS service offered before, but off hand I can't find any. Typically a web company will handle the DNS themselves, and then they can control which server the visitors are sent to.

[gpmgroup]

First setup an IP address for your domain, then add the failover monitor service.
The failover monitor service watches a URL on your webserver by testing to see if a string exists on a URL
When it detects an error it gets a new IP from its list of secondary and/or tertiary servers.
If all of the IPs are unavailable then the failover monitor service assumes the fault is with its connection and takes no action.
Once any problem sites come back on line the they are restored.