Snort - the de facto standard for intrusion detection/prevention
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Example

preprocessor SMTP: \
  ports { 25 } \
  inspection_type stateful \
  normalize cmds \
  normalize_cmds { EXPN VRFY RCPT } \
  ignore_data \
  ignore_tls_data \
  max_command_line_len  512 \
  max_header_line_len   1024 \
  max_response_line_len 512 \
  no_alerts \
  alt_max_command_line_len 300 { RCPT } \
  invalid_cmds { } \
  valid_cmds { } \
  xlink2state { disable } \
  print_cmds



Steven Sturges 2008-04-01