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{{primary sources|date=January 2011}}
'''Firewalking''' is a technique developed by Mike Schiffman and David Goldsmith that utilizes [[traceroute]] techniques and [[Time to live|TTL]] values to analyze [[Internet Protocol|IP packet]] responses in order to determine gateway ACL ([[Access Control List]]) filters and map networks. It is an active reconnaissance [[network security]] analysis technique that attempts to determine which layer 4 protocols a specific firewall will allow.
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