subnet prefix length > 64 breaks IPv6?

sthaug at sthaug at
Wed Dec 28 13:10:52 UTC 2011

> On the other hand there's also the rule that IPv6 is classless and therefore routing on any prefix length must be supported, although for some implementations forwarding based on > /64 is somewhat less efficient.

Can you please name names for the "somewhat less efficient" part? I've
seen this and similar claims several times, but the lack of specific
information is rather astounding.

Steinar Haug, Nethelp consulting, sthaug at

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