Manual Configuration of Interface ID

Pekka Savola pekkas at
Tue Dec 21 07:19:21 CET 2010

On Mon, 20 Dec 2010, Chad Kissinger wrote:
> In manually choosing a 64 bit IPV6 Interface ID, you should follow the following rules (stated in terms of hexadecimal choices):
> 2.  Do not use all 0s with one character at the end (interferes with Embedded-RP RFC 3956)

Use for what?

If you do use multicast, it's true that you may want to use some 
chracters for RFC 3956 purposes.  But given that you can also vary 
this by picking a different prefix length (e.g. a new /48), for a 
typical ISP this is not really a problem.  So there is no inherent 
problem with using addresses above for non-multicast-RP purposes, you 
can just pick something else if you need to.

Pekka Savola                 "You each name yourselves king, yet the
Netcore Oy                    kingdom bleeds."
Systems. Networks. Security. -- George R.R. Martin: A Clash of Kings

More information about the ipv6-ops mailing list