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. Firewalk the tool employs the technique to determine the filter rules in place on a packet forwarding device. The newest version of the tool, firewalk/GTK introduces the option of using a graphical interface and a few bug fixes.
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FIREWALK v0.7 Gateway portscanner
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Firewalk (firewalk/GTK beta static linux ELF binary)
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FIREWALK v0.8 Gateway portscanner
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FIREWALK v0.99b Gateway portscanner
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FIREWALK v0.7 Gateway portscanner
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FIREWALK v0.7c Gateway portscanner
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FIREWALK whitepaper (doc)
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FIREWALK whitepaper (html)
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FIREWALK whitepaper (pdf)
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FIREWALK whitepaper (ps.gz)
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FIREWALK whitepaper (rtf)
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FIREWALK whitepaper (txt)
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