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Have DNS question for Windows 2008 R2

post #1 of 3
Thread Starter 
So I think a diagram will help depict this question better.
What I am trying to find out is. Can a DNS record be set for 2 different IP addresses not associated with the same network block, or can it only be associated with 1 IP address?
This has came about due to the addition of a fail-over ISP
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The Raven
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The Raven
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post #2 of 3
I don't think you can. If you just have two A records, the DNS server will pick one in round-robin fashion (usually).

What you can do is set the TTL for the A record to be short (like 5 minutes), then if you change it, it'll update everywhere within 5 min, but that'll put a lot more load on your DNS server (unless this server isn't used by many people, in which case you're home free).

Failover in datacenters usually works by having multiple connections to the same network, so you get the same IP with the other connection.
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post #3 of 3
Thread Starter 
Problem is we have a requirement for 2 different ISP's coming from 2 different CO's incase of failure i.e. like line is cut with a backhoe. Each ISP connection has it's own set of IP's. Each assigned a /28 for what we need, so the DNS record need each IP address. Obviously we want the DS3 45Mbps as the primary and on the 3Mbps in the event of an outage of the DS3.
The Raven
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