Re: IPSEC transport mode w/2.2.x kernels and large packets

Alan Cox (alan@lxorguk.UKuu.ORG.UK)
Sat, 7 Aug 1999 19:04:44 +0100 (BST)

> > Now TCP generates frames the right size for optimal performance, everything
> > else hands down full datagrams and the world is a happier place.
>
> Alan, the world is not such happy place 8). IPv6 has no DF flag,
> so that path mtu discovery is not an option.

The IPv4 minimum MTU is 68 bytes. Its probably safe to throw away reports
for < 128 bytes (NetROM). The minimum IPv6 MTU is high enough that the
performance hit for current networks is acceptable worst case. So its simply
not worth trying that prank on an IPv6 network

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