minor README update
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README
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README
@ -9,9 +9,10 @@ communicate desired access to a service that is hidden behind a firewall in a
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default-drop filtering stance. The main application of SPA is to use a firewall
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to drop all attempts to connect to services such as SSH in order to make the
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exploitation of vulnerabilities (both 0-day and unpatched code) more difficult.
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Any service that is concealed by SPA naturally cannot be scanned for with Nmap.
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The fwknop project supports three different firewalls: iptables on Linux
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systems, pf on OpenBSD, and ipfw on FreeBSD and Mac OS X.
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Because there are no open ports, any service that is concealed by SPA naturally
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cannot be scanned for with Nmap. The fwknop project supports three different
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firewalls: iptables on Linux systems, pf on OpenBSD, and ipfw on FreeBSD and
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Mac OS X.
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SPA is essentially next generation Port Knocking (PK), but solves many of the
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limitations exhibited by PK while retaining its core benefits. PK limitations
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