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SubjectRe: RFC2385 (MD5 signature in TCP packets) support
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   From: David Schwartz <davids@webmaster.com>
Date: Fri, 15 Mar 2002 15:13:59 -0800

There is no problem with MD5 that makes it unsuitable for this
particular application. A SHA signature would enlarge each packet,
further reducing the effective MTU. This would increase the cost of
what was intended to be a simple mechanism to solve a specific
problem (spoofed SYNs/RSTs).

Ignoring valid RST frames breaks TCP.

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