Date: Wed, 21 Aug 2002 13:20:30 +1000
From: "SEENYEN,GENE (HP-Australia,ex3)" <[EMAIL PROTECTED]>
Message-ID: <[EMAIL PROTECTED]>
| Does the /64 refer to the 10 MSB bits + the 54 bits which are all 0
Yes, the prefix length always counts bits from the leftmost in a 128
bit address, regardless of how many of those have known fixed values
in any particular case.
| Also why use either FE80::/10 or FE80::/64 as the Link local
| address instead of having just one?
It depends upon the context which is better.
All addresses that are FE80::/10 are link local. So, if you are wanting
to test whether an addr is LL or not, that's what you'd be using.
On the other hand, a prefix assigned to (most) nets is a /64, so when
assigning a LL prefix to a LAN (or other net) you need to assign the /64
(you can, if you like, think of this as being one subnet out of the LL
space - except that it is the only one defined, none of the others are
available for use, or would mean anything if they were).
kre
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