Question on DNS resolution

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From: KStahl (ktsahl_at_yahoo.com)
Date: 12/23/04 

Date: Wed, 22 Dec 2004 21:47:29 -0500

Basic parameters:

Several servers are configured with two DNS servers for TCP/IP - neither
server responds. They may be down or simply are not DNS servers any more.

No local host files

Server is configured on an MS ADS domain

ADS domain appears to have more then one domain controller and the
controllers and there appear to be frequent changes in which server is
the master.

Question:

In this situation, whenever there is a DNS request, since there is no
local hosts file, the server tries to query the first DNS server. That
fails. It then tries to query the second DNS server. That also fails.
These failures take a certain amount of time, probably a couple hundred
milliseconds. After both DNS servers have been tried, the request goes
out to the domain controller which does reply with a non-authoratative
response. However, when the domain controllers are flip-flopping this
appears to fail at times and no response is received. The server keeps
trying and eventually it gets a response.

So, my question is, does this appear to be a reasonable analysis? I know
the real answer is to get the DNS server addresses updated to active DNS
servers. I doubt that much can be done about the domain controller
problem. But, if local hosts files were used, would that probably create
a more stable situation and always ensure that resolution occurs quickly?

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