Hi Dario, Great thanks. I had asked as the reasoning for having the fe80::XXXX style was that you could use it to assign easy-to-type link-local addresses to nodes. So for example you could assign the address fe80::1 to a node, and 6lowpan could compress that nicely.
In real life I think most of the time we will see auto-configured link-local addresses anyway, so I think it was also an unlikely case. But I couldn't think of any fe80::ff:fe00:XXXX uses. So knowing there is a few out there, even if they are unlikely, was my concern. The hc-11 draft seems to solve all previous issues I've heard of or run into during implementation of 6lowpan-hc. Thus I would support this draft's LC and sending onward to the IETF. Regards, -Colin -----Original Message----- From: [email protected] [mailto:[email protected]] On Behalf Of Dario Tedeschi Sent: September 2, 2010 12:45 AM To: [email protected] Subject: Re: [6lowpan] Fwd: New Version Notification for draft-ietf-6lowpan-hc-11 I can see four cases where SAM/DAM=2 might be used in stateless compression: 1) A manually configured link-local address. 2) A node acting as a proxy for a specific link-local address. 3) A link-local anycast address. 4) A redirect Perhaps these are unlikely cases, but it's nice to have them covered. Dario On 01/09/2010 2:33 PM, Colin O'Flynn wrote: > Hello, > > I noticed that -10 also changed the format of the link-local stateless > compression to match the stateful global prefix compression. > > Is there a case where you'd want to use the fe80::ff:fe00:XXXX form, where > the XXXX is not the 802.15.4 short address? > > At any rate that change is fine, as it somewhat simplifies the code since > all addressing cases are then the same for the IID. > > Regards, > > -Colin > > -----Original Message----- > From: [email protected] [mailto:[email protected]] On Behalf > Of Jonathan Hui > Sent: September 1, 2010 10:25 PM > To: 6lowpan 6lowpan > Subject: [6lowpan] Fwd: New Version Notification for > draft-ietf-6lowpan-hc-11 > > > By request of the chairs, I have made Dario's suggested change before > submission to IESG. > > This mapping from a short IEEE 802.15.4 address to 64-bit IIDs is > also used to reconstruct any part of an IID not covered by context > information when only 16 bits are carried in-line (SAC/DAC=10). > --> > This mapping from a short IEEE 802.15.4 address to 64-bit IIDs is > also used to reconstruct any part of an IID not covered by context > information. > > -- > Jonathan Hui > > Begin forwarded message: > >> From: IETF I-D Submission Tool<[email protected]> >> Date: September 1, 2010 2:22:17 PM PDT >> To: [email protected] >> Cc: [email protected] >> Subject: New Version Notification for draft-ietf-6lowpan-hc-11 >> >> >> A new version of I-D, draft-ietf-6lowpan-hc-11.txt has been successfully > submitted by Jonathan Hui and posted to the IETF repository. >> Filename: draft-ietf-6lowpan-hc >> Revision: 11 >> Title: Compression Format for IPv6 Datagrams in 6LoWPAN > Networks >> Creation_date: 2010-09-01 >> WG ID: 6lowpan >> Number_of_pages: 23 >> >> Abstract: >> This document specifies an IPv6 header compression format for IPv6 >> packet delivery in 6LoWPAN networks. The compression format relies >> on shared context to allow compression of arbitrary prefixes. How >> the information is maintained in that shared context is out of scope. >> This document specifies compression of multicast addresses and a >> framework for compressing next headers. UDP header compression is >> specified within this framework. >> >> >> >> The IETF Secretariat. >> >> > _______________________________________________ > 6lowpan mailing list > [email protected] > https://www.ietf.org/mailman/listinfo/6lowpan > > _______________________________________________ > 6lowpan mailing list > [email protected] > https://www.ietf.org/mailman/listinfo/6lowpan _______________________________________________ 6lowpan mailing list [email protected] https://www.ietf.org/mailman/listinfo/6lowpan _______________________________________________ 6lowpan mailing list [email protected] https://www.ietf.org/mailman/listinfo/6lowpan
