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Next: Examples/Default Configuration from snort.conf Up: DNS Previous: DNS   Contents

Configuration

By default, all alerts are disabled and the preprocessor checks traffic on port 53.

The available configuration options are described below.

79.
ports $\{ <$port$> [<$port$> <...>] \}$

This option specifies the source ports that the DNS preprocessor should inspect traffic.

80.
enable_obsolete_types

Alert on Obsolete (per RFC 1035) Record Types

81.
enable_experimental_types

Alert on Experimental (per RFC 1035) Record Types

82.
enable_rdata_overflow

Check for DNS Client RData TXT Overflow

The DNS preprocessor does nothing if none of the 3 vulnerabilities it checks for are enabled. It will not operate on TCP sessions picked up midstream, and it will cease operation on a session if it loses state because of missing data (dropped packets).


Steven Sturges 2008-04-01
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