Re: IPv6 Firewire - fffe (was: what problem is solved by proscribing non-64 bit prefixes?)

[Alexandru Petrescu <alexandru.petrescu at gmail.com>]

Michael, allow me following up my own email.  Re the question about 
implementations of IPv6 over Firewire, I wanted to refine it.

I think some implementations of IPv6 over Firewire may still waste these 
fffe bits, still questioning the point of 64-bit EUI-64 (instead of say 
48bit).

(googling some earlier discussion on web [*]):
> $ ifconfig fw0
             ^^^
> fw0: flags=8863<UP,BROADCAST,SMART,RUNNING,SIMPLEX,MULTICAST> mtu 2030
>         inet6 fe80::21c:b3ff:fe7c:d17a%fw0 prefixlen 64 scopeid 0x5
                            ^^^^^
>         lladdr 00:1c:b3:ff:fe:7c:d1:7a
                          ^^^^^
The refined question would thus be: would there be some IPv6 over 
Firewire implementation which wouldn't waste these fffe bits?

(sorry for the questioning style of mails, I'm just humbly trying to see
 whether I'm completely off with these fffe lost bits).

Alex
[*] http://lists.apple.com/archives/ipv6-dev/2007/Dec/msg00001.html

Alexandru Petrescu wrote:
> michael.dillon at bt.com wrote:
> > > I'm aware of several IEEE link layers and none uses 64bit addresses. 
> > > IEEE tries to have them all 48bit.  Even non-IEEE (like USB) tries to 
> > > be 48bit.
> >
> > Have you ever heard of EUI-64?
> > <http://standards.ieee.org/regauth/oui/tutorials/EUI64.html>
>
> Well yes, good pointer.
>
> > One notable IEEE protocol which uses EUI-64 is Firewire (IEEE 1394). For
> > more info see RFC 3146.
>
> Thanks for this pointer too.  I must ack I've not experimented IPv6 nor 
> IPv4 over Firewire.  Are there some implementations of IPv6 over Firewire?
>
> Alex
>
>
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