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Configuring TCP SYN-FIN Attack Screen

This topic describes how to configure detection of a TCP SYN-FIN attack.

A TCP header with the SYN and FIN flags set is anomalous TCP behavior causing various responses from the recipient, depending on the OS. Blocking packets with SYN and FIN flags helps prevent the OS system probes.

To enable detection of TCP SYN-FIN bits:

  1. Configure interfaces and assign an IP address to interfaces.
  2. Configure security zones trustZone and untrustZone and assign interfaces to them.
  3. Configure security policies from untrustZone to trustZone.
  4. Configure security screens and attach them to untrustZone.
  5. Configure syslog.
  6. Commit the configuration.