Question : DNS Round Robin

DNS round robin question

If i have two servers with the same DNS name   (limited lb)

I ping the dns name and get server A


turn server a off i still get a servera response (timed out)

if i flush dns it swaps to Server B

can I get it to check server b if server a fails rather than just keeping the setting?


windows 2003

Answer : DNS Round Robin

> can I get it to check server b if server a fails rather than just keeping the setting?

No.

DNS doesn't care about the service you run on an IP. That you got Server b back afterwards is pot-luck, it rotates the responses (that's what Round Robin does).

If you want service awareness you need to do one of these:

1. Have something monitor the service and modify DNS records if it fails
2. Get a Hardware Load Balancer
3. Use some form of Clustering

Chris