Hi Chirayu,
No. You cannot use fe81::/16 as a link local address. 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.
Regards
Suresh
-----Original Message-----
From: Chirayu Patel [mailto:[EMAIL PROTECTED]
Sent: Wednesday, August 27, 2003 8:49 AM
To: [EMAIL PROTECTED]
Subject: What is the length of the Link-Local prefix?
I was always under the assumption that the prefix is fe80::/64, and not
fe80::/10. However, the latest and the best version of the Addressing
Architecture [RFC 3513] states the prefix as fe80::/10. Does it mean that
fe81::/16 can also be used as a link local prefix (note : section 2.5.6 in RFC
3513 says that the next 54 bits after the prefix should be zero)?
A grep for fe80 in my rfc repository yields (note: the fe80::/64, and
fe80::/10)
----
rfc2464.txt:179: the prefix FE80::/64.
rfc2467.txt:252: prefix FE80::/64.
rfc2470.txt:299: prefix FE80::/64.
rfc2491.txt:1259: token, as defined above, to the prefix FE80::/64.
rfc2497.txt:135: prefix FE80::/64.
rfc2529.txt:184: the prefix FE80::/64.
rfc2529.txt:296: cases with the prefix FE80::/64. Note that the prefix-
rfc2546.txt:98: The link-local prefix (FE80::/10) MUST NOT be advertised
rfc2590.txt:480: above, to the prefix FE80::/64 [AARCH].
rfc2740.txt:1751: Link-local Interface Address = fe80:0001::RT3
rfc2772.txt:156: This link-local prefix (FE80::/10) MUST NOT be advertised
through
rfc2893.txt:966: the prefix FE80::/64.
rfc3146.txt:152: the prefix FE80::/64.
rfc3484.txt:1034: fe80::/10 33 1
rfc3513.txt:327: Link-local unicast 1111111010 FE80::/10
----
Am I missing something?
Thanks,
CP
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