Jonathan,
Having been convinced we won't run out of IPv6 addresses, I also prefer
option 1, keeping ff:ee.
This mean we can safely determine whether an IPv6 address has been
derived from a short address or a full EUI. We use this to determine
whether to use short or extended layer 2 addresses when transmitting.
Daniel.
Jonathan Hui wrote:
Hi Joseph,
I believe there was a strong reason for keeping the IID at 64 bits -
because that's what the reset of the IPv6 addressing architecture tends
to assume.
To drive the discussion, can you state why you prefer 'ff:fe'? Simply
to close to, but not exactly with RFC 4944? As I stated before, trying
to avoid global-scoped IEEE addresses is a non-issue since short
addresses have local scope.
--
Jonathan Hui
On Mar 30, 2010, at 10:13 AM, Reddy, Joseph wrote:
Hi Jonathan
I prefer option 1.
I still believe this should be paired with a 112 bit prefix and not
64-bit prefix as you suggest
-Joseph
On Mar 30, 2010, at 05:36, Jonathan Hui wrote:
Typing ...::ff:fe00:xxxx is a bit ugly, granted.
If we were designing 4944 from scratch, I would buy that argument.
However, it was agreed in May 2007, and I'd like to see a better
argument to change it incompatibly.
AFAIK, there are only a handful of independent implementations that
have tested interoperability to this day and even less with the use of
short addresses. W.r.t. 6lowpan-hc there was ambiguity over whether or
not to use the PAN ID in the IID. It seems that we need to change
something to better achieve interoperability. There's already
consensus to never include the PAN ID in the IID, so an update to
Section 6 of RFC 4944 is already necessary.
I believe the vast majority of implementors are subscribed to this
list. So which of the following options do people prefer?
1) IPv6 addrs that have the form aaaa::ff:fe00:xxxx.
2) IPv6 addrs that have the form aaaa::1:xxxx.
In both cases, the prefix and IID is 64 bits. At this point it's just
a matter of how many zeros are involved. It's a minor point, so I
wouldn't dwell on this issue too long.
--
Jonathan Hui
_______________________________________________
6lowpan mailing list
[email protected]
https://www.ietf.org/mailman/listinfo/6lowpan
_______________________________________________
6lowpan mailing list
[email protected]
https://www.ietf.org/mailman/listinfo/6lowpan
--
__________________________________________________
Daniel Gavelle, Software Engineer
Tel: +44 114 281 2655
Fax: +44 114 281 2951
Jennic Ltd, Furnival Street, Sheffield, S1 4QT, UK
Comp Reg No: 3191371 Registered In England
http://www.jennic.com
__________________________________________________
_______________________________________________
6lowpan mailing list
[email protected]
https://www.ietf.org/mailman/listinfo/6lowpan
