Knock: A Linux kernel patch for NAT-compatible, stealthy port knockingDec 14, 2013, 11:00 (1 Talkback[s])
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A Linux kernel patch that “implements a new NAT-compatible, TCP option for stealthy port knocking with a few new twists for improved security” has been released.
Port knocking is a security implementation that’s designed to reduce the visibility of TCP servers on the network. A good port knock tool renders TCP servers stealthy, making them invisible to port scanners.
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