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{{notability|date=January 2011}}
{{primarysources|date=January 2011}}
Firewalking is a technique developed by Mike Schiffman and David Goldsmith that employs traceroute-like techniques to analyze IP packet responses to determine gateway ACL filters and map networks. It is an active reconnaissance network security tool that attempts to determine what layer 4 protocols a given IP forwarding device "firewall" will pass.<br />
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Firewalk is a tool to perform Firewalking. To protect a firewall / gateway against firewalking one can block [[Internet Control Message Protocol|ICMP]] [[ICMP Time Exceeded|Time Exceeded]] messages<ref>Rahul Kokcha</ref>.
== See also ==
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