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Essential Check Point™ FireWall-1® NG: An Installation, Configuration, and Troubleshooting Guide by Dameon D. Welch-Abernathy

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Basic INSPECT Syntax

This section, by presenting simple examples, provides a rudimentary description of how to read and understand INSPECT code.

INSPECT is a fairly simple script-like language that contains a series of statements designed to evaluate packets and make decisions about what to do with the packet. Although this is not a complete BNF[1] for the language, it should give you a rough idea of what to expect.

[1] BNF is an acronym for Backus Normal Form or Backus Naur Form. It is a standard format used to describe programming languages, first introduced in the Algol-60 report by John Backus and Peter Naur. Computer science luminary Donald Knuth recommended that Backus Normal Form should be renamed Backus Naur Form to honor the two authors ...

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