Abstract
We statistically investigated on the unusual big DNS resolution traffic toward the top domain DNS server from a university local campus network in April 11th, 2006. The following results are obtained: (1) In April 11th, the DNS query traffic includes a lot of fully qualified domain names (FQDNs) of several specific web sites as name resolution keywords. (2) Also, the DNS query traffic includes a plenty of source 1P addresses of PC clients. Usually, we can observe the source 1P addresses of E- mail and/or Web servers in the usual DNS query traffic, mainly. From this point, it can be concluded that the PC clients are probably infected with hot worms (BWs) and they have tried to crash the top domain DNS server.
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