Malicious DNS request?

Thu May 12 08:11:35 UTC 2005

Hi,

In past days I noticed the nxdomain statistics in
named.stats keeps increasing.( I run it every 5 min)

By tcpdump, it's found a remote computer keep asking
address for record like
999d38e693b9e6293b450.0existence.com,
60d38e693b9e6293b450.0be6c1xfa.net. 

is that a virus affacted computer? 

How could such request be filtered or minimize its
affaction on DNS server?

regards

Joe

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