Re: unicast address with non 64 bit prefix

2011-07-15 Thread Kerry Lynn
Brian, you're quite right. I had in mind only one particular class of IID. Washam, see Appendix A of RFC 4291 regarding modified EUI-64 IIDs with "u"=0. Also, RFC 3041 has been obsoleted; see RFC 4941 and its errata if privacy issues apply in your situation. -K- On Fri, Jul 15, 2011 at 6:25 P

Re: unicast address with non 64 bit prefix

2011-07-15 Thread Brian E Carpenter
The authors of RFC 4291 chose not to use the upper case normative keyword convention defined in RFC 2119. Therefore, 'required' means what in means in plain English (i.e. REQUIRED in RFC2119ish). Brian On 2011-07-15 19:03, Washam Fan wrote: > Hi, > > I quoted this paragraph from RFC4291: > >

Re: Best venue to begin addressing the "/64 ND DoS" concerns ?

2011-07-15 Thread Philip Homburg
In your letter dated Fri, 15 Jul 2011 09:31:12 -0400 you wrote: >To some extent, I would prefer an approach where IPv6 Ops would work >on that informational document (threats/concerns, operational use cases, >existing mitigations that could be deployed) first. Then, if there >were use cases not ad

Best venue to begin addressing the "/64 ND DoS" concerns ?

2011-07-15 Thread RJ Atkinson
On 14 Jul 2011, at 23:00 , Joel Jaeggli wrote: > On Jul 13, 2011, at 9:51 AM, RJ Atkinson wrote: > >> On Weds 13 July 2011 at 11:54:08 -0400, Joel Halpern wrote: >>> There appear to be several different cases, which can be addressed >>> by different reasonable mechanisms (not firewalls, and not

Re: unicast address with non 64 bit prefix

2011-07-15 Thread Kerry Lynn
See also section 2.5.4 of RFC 4291: "All Global Unicast addresses other than those that start with binary 000 have a 64-bit interface ID field (i.e., n + m = 64), formatted as described in Section 2.5.1." So I'd say the answer is the IID MUST be 64 bits long, and MUST satisfy the properties of u

unicast address with non 64 bit prefix

2011-07-15 Thread Washam Fan
Hi, I quoted this paragraph from RFC4291: For all unicast addresses, except those that start with the binary value 000, Interface IDs are required to be 64 bits long and to be constructed in Modified EUI-64 format. But I am not sure how to interpret the text in a correct way. If I ass