Using IPv6 with prefixes shorter than a /64 on a LAN

sthaug at sthaug at
Tue Jan 25 00:02:30 CST 2011

> > IPv6 is classless; routers cannot blindly make that assumption for "performance optimization".
> > 
> Blindly, no. However, it's not impractical to implement fast path switching that
> handles things on /64s and push anything that requires something else
> to the slow path.

Any vendor who was stupid enough to do *hardware* switching for up to
/64 and punted the rest to software would certainly not get any sales
from us.

128 bits. No magic.

Steinar Haug, Nethelp consulting, sthaug at

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