IPV6 planning

Baldur Norddahl baldur.norddahl at gmail.com
Mon Mar 7 01:57:44 UTC 2016

Den 6. mar. 2016 13.41 skrev "Karl Auer" <kauer at biplane.com.au>:

> Dunno about "harsh", but RFC 2464, section 4 says that the prefix must
> be 64 bits. By (extremely strong) implication, a host must not use a
> prefix of any other length to perform SLAAC. I say "extremely strong"
> because the entire description of how an IPv6 Ethernet interface
> identifier is formed depends on it being composed of the prefix plus an
> EUI-64 identifier. Later RFCs firm up the requirement and apply it in
> other contexts.

But the most popular OS (Windows) completely ignores all of that and makes
up an identifier not based on EUI-64. Everyone are happy anyway. The RFC
should have let identifier selection as an implementation detail as the
risk of collision is almost non existent given a sufficient random
selection and we have duplicate address detection as a safeguard.



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