DNS help

[deadseasquirrel]

Buddy of mine hosts his own website at his office. He's got a T1 from company ABC that customers come in on and hit the webserver. He has his own Class C from ARIN, and handles his own DNS. He wants to get a T1 from company XYZ and plans to run voice over it, but also would like to have it be the backup for the website in case ABC's T1 goes down.

How can he do this easiest/cheapest/most reliable?

 

[Cooky]

If he has DNS set up already you don't really have to worry about how DNS will be affected by the second T1 line.
All you need to do is pop in a 2nd WAN interface card into the existing perimeter router.
If you're looking for a really cheap solution, check out Xincom's routers.

 

[Variable D]

A router doing BGP will do failover automatically, you can keep the VOIP network separate and still have failover triggers. . What kind of router does he have? Why do you think it is a DNS problem?

 

[deadseasquirrel]

Sorry, forgot to mention, for the VoIP, he's gonna need to have a seperate router. And it HAS to be Cisco 2600. Requirements from company XYZ.

So, he'll have Company ABC T1 terminating to a _____ router? (no idea). And Company XYZ terminating to a 2600 for VoIP and (hopefully) backup.

So, this is where I get lost. If I'm a customer of his and I know to find him at www.hereheis.com, which points to his own Class C running on the T1 from ABC, how will it auto fail over to the other T1 (from XYZ) that terminates into a completely different router and still hit the website at www.hereheis.com?

 

[Cooky]

The IP that www.hereheis.com resolves into is not tied w/ ABC.
Assume the router he uses for ABC has 2 interfaces - s0 & e0. s0 will have ABC's IP, and e0 will have one of his class C IP's (say, 206.1.1.1). The same for the Cisco 2600 - s0 will have XYZ's IP and e0 will have another one of his class C IP's (206.1.1.2).
The IP that the domain maps to is something different from the IP's on the routers (206.1.1.254).
So you see, there's no affect on how visitors will get to 128.230.1.254 when there's a fail-over.