a question on bind cache

[Tech W.]

Hello,

We have been facing this problem, sometime the original server was down, but Bind didn't know it, and still answered clients with the dead IP.
Or sometime an external domain name has two or more IPs,  accessing to part of them is fast, but accessing to another part is slow.
So, do you think is there a resolving way for Bind which can implement the features:

1. check the popular domains' original IPs (like google's, yahoo's, aol's etc), and exclude the dead IPs from its cache.
2. for the popular domains, testing the access speed to each of their IPs and answers the fast IPs to local clients.

Thanks for any suggestion.

Regards,
Wah.



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