Dual internet connections, ip's and one web server ?

This is a curiousity question more then anything. We have two 3Mbit fiber internet connections with two different ISP's. Both network connections come with different sets of IP's. We have one DNS server on one of the ISP connections basically, then our secondary is done elsewhere.

Currently our web server is hosted else where as well, but we are bringing it in house now.

I was trying to figure out a way to utilize the two different internet connections for redundency / failover if that makes sense. What the plan was, we were going to use BGP but due to some addressing issues and so on we just aren't big enough apparently to use BGP between the two ISP's.

So.. now I am trying to think of some other way. One thought, which I dont think will work was maybe using two DNS servers one accessible using the IP network of one of the ISP connections, and the other DNS server via the other ISP connection. The thought being if say DNS1 is down or unreachable it would people would failover to using say DNS2 on the other network. However, I dont know how you get around the hostname say "www".domainname.com, DNS will know "www" as having only one IP address, and well if that is pointing to an IP on the ISP connection that is down then that will not work.

Any ideas here ? Open to just a friendly discussion on possibilities. I thought at some point in time I had come across something about DNS doing something like this, but who knows. Any thoughts or ideas would be appreciated.

 

 

 

 

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