If the prefix is longer than 64, don't use EUI-64 interface ID. (7.2)If the prefix length is greater than 64 and is not greater than 80, an address is formed by combining the advertised prefix with the MAC address of the interface as follows:
| N bits | (80 - N) bits | 48 bits | +------------------------------+---------------+-----------------+ | link prefix | reserved | MAC address | +----------------------------------------------------------------+ (7.3) If the prefix length is greater than 80, a random number between 0 and 2 ^ (128 - prefix length) is generated, and an address is formed by combining the advertised prefix with the random number as follows: | N bits | 128 - N bits | +---------------------------------------+------------------------+ | link prefix | random number | +----------------------------------------------------------------+ From: Duncan, Richard J. (Jeremy) CONTRACTOR Sent: Thursday, March 03, 2011 10:56 PM To: Yu Hua bing ; trej...@gmail.com ; Brian E Carpenter Cc: Thomas Narten ; ipv6 ; Scott W Brim Subject: RE: [BULK] Re: draft-yhb-6man-slaac-improvement-00 I think that SLAAC should be deployed in the sites which use the prefixes longer than 64. Don't put a limit on the prefix length. DHCPv6 can be deployed in the sites which use the prefixes longer than 64.Why can't SLAAC? It is not reasonable. No. EUI-64 requires 64 bit host id's. 48 bits is from the MAC. How would you plan to squeeze blood out of the proverbial turnip? 010100110110010101101101011100000110010101110010001000000100011001101001 Jeremy Duncan Defense Threat Reduction Agency (DTRA) BE-BI INFOCON 3, IPv6 Architect Command Information Google Voice: (540) 440-1193 --------------------------------------------------------------------------------
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