On Aug 27, 2003, at 9:19 AM, Derek Fawcus wrote:
On Wed, Aug 27, 2003 at 09:57:23AM -0500, Suresh Krishnan (QB/EMC) wrote:Hi Chirayu, No. You cannot use fe81::/16 as a link local address
Of course you can.
Even though the RFC states that the prefix is fe80::/10 it really should be fe80::/64. Section 2.5.6 of RFC3513 explicitly states that the 54 bits following 1111111010 should be set to 0 and thus the only allowable prefix is fe80::/64.
The contents of the 54 bits are only a should, as such one can use whatever
one wants in there.
Nothing breaks (wrt normal LL address usage) if those 54 bits have non zero
values.
Actually, you'll run in to some issues with any IPv6 stack based on Kame's implementation. Kame makes use of some of those bits to embed the scope id in some places while packets are handled in the kernel and in a few cases this may be used between the kernel/userspace boundary. Arguably, it's not the right thing for the stack to do, but it is done.
-josh
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