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The crl_dnsstat application watches for DNS queries on UDP port 53. To collect
accurate statistics on a specific nameserver (or client), it must be run on an
interface that sees all DNS messages to that server (or from that client). It
counts numbers of messages and numbers of queries, aggregated by any of source
IP, destination IP, opcode, query type, query class. The subjects of queries
are never recorded.
The example output below shows the finest aggregation (most detail) it is
capable of recording; command line options can be used to reduce the detail.
The "notes" column displays any unusual statistics: the number of messages that
contained multiple queries or zero queries, and the number of messages for
which the number of queries was impossible to determine.
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