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{{notability|date=January 2011}}
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'''Firewalking''' is a technique developed by Mike Schiffman and David Goldsmith that utilizes traceroute techniques and TTL values to analyze 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.<br />
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Firewalk is a software tool that performs 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>
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