The EUI-64 ID is just one way to build the 64-bit interface ID, and is the way specified for auto-address configuration. The 64-bits may also be manually configured - simple numbers that might be easier to organize than a seemingly random number, or even intentionally random numbers that change periodically to keep network traffic analysts off your trail. DHCPv6 can also be used - one day.
When you use the EUI-64 to self-configure the addresses, you get to set the "global" bit in the interface ID, but you still need to run Duplicate Address Detection. Also, for a server that lists it's IPv6 address in a directory, it is still desireable to make that address independent of the hardware address - just as it has always been for IPv4. The client system derives the benefit from auto-addressing, and from the privacy extensions, neither of which is all that compelling for a server. Keep reading :-) Cyndi -----Original Message----- From: Huber Matthias [mailto:[EMAIL PROTECTED]] Sent: Wednesday, November 28, 2001 5:49 AM To: [EMAIL PROTECTED] Cc: [EMAIL PROTECTED] Subject: Address Resolution with ND verus MAC address from the EUI-64 form at Hello all, I've read already a couple of RFCs and books to familiarize myself with IPv6. I'm struggling with the following: Neighbor discovery is used to find out the corresponding Layer-2 address to a given IPv6 unicast address ( similar to the ARP process in IPv4). On the other hand I have learned that all global aggregatable unicast addresses have to use the EUI-64 format for the interface ID. At least in a Ethernet (I think this is the majority of the LANs today) this EUI-64 ID is derived from the MAC address in an reversible way. (Simply adding/removing 0xFFFE in the "middle"). So my question is why do I need the ND in a LAN in order to do the address resolution ??? I know that there must be a simple reason, but I don't know it. Is anyone able to sched some light into this ? Thanks very much Matt Mit freundlichen Gr�ssen / with kind regards Matthias Huber Siemens AG I&C Training Institute CCSI CCNA ICM CA VZ TI A5 Phone +49 89-722-34051 Baierbrunnerstrasse 28 Fax +49 89-722-61684 81359 Munich/Germany Mail mailto:[EMAIL PROTECTED] -------------------------------------------------------------------- IETF IPng Working Group Mailing List IPng Home Page: http://playground.sun.com/ipng FTP archive: ftp://playground.sun.com/pub/ipng Direct all administrative requests to [EMAIL PROTECTED] -------------------------------------------------------------------- -------------------------------------------------------------------- IETF IPng Working Group Mailing List IPng Home Page: http://playground.sun.com/ipng FTP archive: ftp://playground.sun.com/pub/ipng Direct all administrative requests to [EMAIL PROTECTED] --------------------------------------------------------------------
