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I have been looking around for clues on how to define rules, decoders or preprocessors to be able to content-inspect the TCP Header's Optional Data ( The last 0-40 bytes of the TCP Header)

TCP Header

Any clues? Is Snort even able to do that?

3

Snort don't support to check tcp header length.

But if snort connecting to database, it can store optional data of ip and tcp.

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