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offset

The offset keyword allows the rule writer to specify where to start searching for a pattern within a packet. offset modifies the previous 'content' keyword in the rule.

An offset of 5 would tell Snort to start looking for the specified pattern after the first 5 bytes of the payload.

As this keyword is a modifier to the previous 'content' keyword, there must be a content in the rule before 'offset' is specified.

See Figure [*] for an example of a combined content, offset, and depth search rule.


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Steven Sturges 2007-10-04
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