Alex, While I agree that the use of an EUI-64 network identifier predicates a 64-bit prefix, I am not convinced that an EUI-64 is the best way to go. After all, the Ethernet MAC address is only 48 bits, so we are essentially "throwing away" 16 bits (assuming that the identifier is globally unique). Further, we require the use of DAD, so why not just use a 32 bit pseudo random number generated by the device and let DAD take care of the possibility of address duplication?
Best Regards, Jeffrey Dunn Info Systems Eng., Lead MITRE Corporation. (301) 448-6965 (mobile) -----Original Message----- From: Alexandru Petrescu [mailto:[EMAIL PROTECTED] Sent: Wednesday, October 01, 2008 9:11 AM To: Dunn, Jeffrey H. Cc: Brian Dickson; Brian E Carpenter; Alexandru Petrescu; IETF IPv6 Mailing List; Pekka Savola; Ron Bonica; [EMAIL PROTECTED]; Pasi Eronen; Sherman, Kurt T.; [EMAIL PROTECTED]; [EMAIL PROTECTED]; [EMAIL PROTECTED]; [EMAIL PROTECTED]; V6ops Chairs; Martin, Cynthia E. Subject: Re: Why would anyone want to use a 64 bit interface identifier? (was: what problem is solved by proscribing non-64 bit prefixes?) Dunn, Jeffrey H. wrote: [...] > As a result of these observations, I am turning the question around: > Why would anyone want to use a 64 bit interface identifier? I speculate that one possible reason for this was to design a SLAAC over Ethernet that is reliable, simple, universal and straightforward to implement. In a way, I see SLAAC to have become so popular as opposed to DHCP. Were DHCPv6 more developed we wouldn't have this IID-64bit problem, I think. Alex ______________________________________________________________________ This email has been scanned by the MessageLabs Email Security System. For more information please visit http://www.messagelabs.com/email ______________________________________________________________________ -------------------------------------------------------------------- IETF IPv6 working group mailing list [email protected] Administrative Requests: https://www.ietf.org/mailman/listinfo/ipv6 --------------------------------------------------------------------
