Technically you would comply with the RFCs, but the FFFE value was negotiated with the IEEE to avoid colliding with their eventual conversion to EUI-64. If you pick other values for the actual mac you need to talk to the IEEE, but if it is only the IPv6 address the bits will work until an implementation gets a full EUI-64 and doesn't want you claiming its autoconfigured address. Other than that you will simply confuse people that read documents that state the EUI-48 transform is supposed to be FFFE.
If you really want an implementation specific value, don't bother copying the mac, hash it then put in your filler. Tony > -----Original Message----- > From: [email protected] [mailto:[email protected]] On Behalf Of > Vijayrajan ranganathan > Sent: Tuesday, June 23, 2009 10:09 PM > To: [email protected] > Subject: Implementation specific Interface-ID > > Hi Everyone, > > I have an ethernet interface for which I am defining the Interface-ID > in a different manner. > > For an ethernet interface with MAC "34-56-78-9A-BC-DE", I am defining > the Interface-ID to be "34-56-78-xy-zw-9A-BC-DE" instead of > "36-56-78-FF-FE-9A-BC-DE" > > where x,y,z,w are my implementation-defined octets. > > Note: > 1. I am fine with a locally-unique Interface-ID > 2. The solicited-node multicast address i'll generate for a given > unicast/anycast address based on this Interface-ID is the same as > that for RFC 2464 based Interface-ID. > > > Assuming I make this change in an IPv6 stack which conforms to RFCs > > 2464 - Transmission of IPv6 Packets over Ethernet Networks > 3513 - Internet Protocol Version 6 (IPv6) Addressing Architecture > 4861 - Neighbor Discovery for IP version 6 (IPv6) > 4862 - IPv6 Stateless Address Autoconfiguration > 3810 - Multicast Listener Discovery Version 2 (MLDv2) for IPv6 > > After this change, will I still conform to these RFCs?? > > > Thanks & Regards > Vijay > -------------------------------------------------------------------- > IETF IPv6 working group mailing list > [email protected] > Administrative Requests: https://www.ietf.org/mailman/listinfo/ipv6 > -------------------------------------------------------------------- -------------------------------------------------------------------- IETF IPv6 working group mailing list [email protected] Administrative Requests: https://www.ietf.org/mailman/listinfo/ipv6 --------------------------------------------------------------------
