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Are these DNS Requests Excessive?

Posted on 2013-06-07
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Last Modified: 2013-06-10
Our UTM Firewall is alerting us to the fact that a number of DNS servers are going over set thresholds for DNS communication.

Now, I'm not saying something is wrong - the default threshold could just be set too low for instance - but I want to make sure given the size of the networks (all relatively small), the number of requests do not stand out as excessive.

How can I get a true metric of how many DNS requests are being processed per hour/day?
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Question by:bikerhong
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Rich Weissler earned 2000 total points
ID: 39230226
On a windows server, the easiest way to collect the statistics would be with Performance Monitor.  The Windows DNS server adds counters for the DNS object.

I assume what you'll want to watch for is recursive queries... I know that's what my security folks have been chattering about lately.  Apparently open DNS servers which accept recursive queries are being used as a distributed denial of service attack against folks.  (I don't have any details, I just know an error was discovered on an edge router which was permitting the traffic on tcp/53... and it's fixed now.   We dropped from ~100 recursive queries/sec to a more normal 20-25.  We have a moderate size network though.)
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by:bikerhong
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Aha, interesting.

I have set perfmon to display some DNS stats and everything is really low - Ill keep an eye on it.
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