Using a program that modifies headers, flags, and checksums during creation allows for thorough testing of a firewall's filtering rules. An intercepting proxy focuses on adjusting ongoing sessions and is less flexible for creating custom data sets. Network analysis utilities capture traffic but do not generate or craft new data. Repetitive scripts for credential attempts do not modify packet fields.
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Why is modifying headers, flags, and checksums useful for testing firewalls?
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What is the difference between capturing traffic and generating custom packets?
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What tools can be used to modify packet headers, flags, and checksums?