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).
What it comes down to is simply whether you care whether Linux machines can
interoperate with Cisco's BGP authentication scheme. This feature would be
very useful to me, so I personally do care, even if the scheme is not the
best possible scheme.
DS
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