Re: Is 1111 1110 10 equal to 0xfe80 or...
Alexandre Petrescu <alexandre.petrescu@gmail.com> Sat, 15 June 2019 15:17 UTC
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Subject: Re: Is 1111 1110 10 equal to 0xfe80 or...
To: James R Cutler <james.cutler@consultant.com>
Cc: "Mudric, Dusan (Dusan)" <dmudric@avaya.com>, "ipv6@ietf.org" <ipv6@ietf.org>
References: <DM6PR15MB2506E62560613C85F74A1FF8BB100@DM6PR15MB2506.namprd15.prod.outlook.com> <cb14591f-3abe-55e6-5bf8-f55afb68cae0@gmail.com> <1CB66B2D-08CE-4EA4-8901-F3A2967A2113@consultant.com>
From: Alexandre Petrescu <alexandre.petrescu@gmail.com>
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Date: Sat, 15 Jun 2019 17:17:19 +0200
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Le 09/06/2019 à 17:56, James R Cutler a écrit : >> On Jun 9, 2019, at 11:50 AM, Alexandre Petrescu >> <alexandre.petrescu@gmail.com <mailto:alexandre.petrescu@gmail.com>> >> wrote: >> >> >> >> Le 07/06/2019 à 21:29, Mudric, Dusan (Dusan) a écrit : >>>> Message: 3 Date: Fri, 7 Jun 2019 10:53:28 -0700 From: Fred Baker >>>> <fredbaker.ietf@gmail.com <mailto:fredbaker.ietf@gmail.com>> To: >>>> Alexandre Petrescu >>>> <alexandre.petrescu@gmail.com <mailto:alexandre.petrescu@gmail.com>> >>>> Cc: IPv6 <ipv6@ietf.org <mailto:ipv6@ietf.org>> Subject: >>>> Re: Is 1111 1110 10 equal to 0xfe80 or 0x3fa? Message-ID: >>>> <A722E202-7671-4111-BA92-8A67B3D3B924@gmail.com >>>> <mailto:A722E202-7671-4111-BA92-8A67B3D3B924@gmail.com>> Content-Type: >>>> text/plain; charset="us-ascii" >>>> If I have prefix fe80::/10, as described in RFC 4291, the next bit >>>> is bit 11. Doing the same subdivision of the prefix is fe80::/11 >>>> and fea0::/11. >>> [Dusan] The hexadecimal definition for LL address is not >>> syntactically correct. The binary 10 bit prefix 1111111010 cannot be >>> presented as hexadecimal FE80::/10. It is rather a range FE80::/10 - >>> FEBF::/10. >> >> I fully agree. That is what we should be talking about: a range. The >> fe80::/10 to febf::/10 is the prefix of link local addresses. >> >> The difficulty (not able to say just one hextet fe80, but a range from >> one hextet to another) is due to the IPv6 notation, the textual >> representation of IPv6 addresses. >> >> It is still strange to say that the bit pattern 1111 1110 10 can not >> be represented in hexa. Or maybe there is a need of a new base. >> >>> In this notation, FE80::/10 = FEBF::/10, because the >>> first 10 bits are equal and other 6 should be ignored. >> >> I agree. >> >>> 111 1111010 >>> can be defined as FE80::/10 only if every time it is also mentioned >>> that the trailing 6 bits are all zero. >> >> I agree. And the trailing 6 bits are not all zero. RFC 4291 makes >> them to be 0, but IANA allocation does not make them to be 0. >> >>> But, it is very common to say >>> FE80::/10 is LL prefix, without mentioning the 6 trailing bits to be >>> zeros. >> >> I agree. Whoever I spoke to about LL was saying they are FE80. >> >> On another hand, there is a similar difficulty with fc and fd in ULA >> addresses. In the v6ops WG, and in the ULA RFC, there seems to be a >> clearer idea about the ULA notation. >> >> In private I am also told to get mind around around CIDR notation. > > Aye, there’s the nub. What is a nub? Alex >> >> Alex >> >>> -------------------------------------------------------------------- >>> IETF IPv6 working group mailing list ipv6@ietf.org >>> <mailto:ipv6@ietf.org> Administrative >>> Requests: https://www.ietf.org/mailman/listinfo/ipv6 >>> -------------------------------------------------------------------- >> >> > James R. Cutler > James.cutler@consultant.com <mailto:James.cutler@consultant.com> > GPG keys: hkps://hkps.pool.sks-keyservers.net > > > >
- Is 1111 1110 10 equal to 0xfe80 or 0x3fa? Alexandre Petrescu
- Re: Is 1111 1110 10 equal to 0xfe80 or 0x3fa? Bob Hinden
- Re: Is 1111 1110 10 equal to 0xfe80 or 0x3fa? Tom Herbert
- Re: Is 1111 1110 10 equal to 0xfe80 or 0x3fa? Sander Steffann
- Re: Is 1111 1110 10 equal to 0xfe80 or 0x3fa? Warren Kumari
- Re: Is 1111 1110 10 equal to 0xfe80 or 0x3fa? Fred Baker
- Re: Is 1111 1110 10 equal to 0xfe80 or 0x3fa? Alexandre Petrescu
- Re: Is 1111 1110 10 equal to 0xfe80 or 0x3fa? Alexandre Petrescu
- Re: Is 1111 1110 10 equal to 0xfe80 or 0x3fa? Alexandre Petrescu
- Re: Is 1111 1110 10 equal to 0xfe80 or 0x3fa? Karl Auer
- Re: Is 1111 1110 10 equal to 0xfe80 or 0x3fa? Bless, Roland (TM)
- Re: Is 1111 1110 10 equal to 0xfe80 or 0x3fa? Fred Baker
- Re: Is 1111 1110 10 equal to 0xfe80 or 0x3fa? Mudric, Dusan (Dusan)
- Re: Is 1111 1110 10 equal to 0xfe80 or 0x3fa? Tom Herbert
- Re: Is 1111 1110 10 equal to 0xfe80 or... Alexandre Petrescu
- Re: Is 1111 1110 10 equal to 0xfe80 or... James R Cutler
- RE: Is 1111 1110 10 equal to 0xfe80 or 0x3fa? Mudric, Dusan (Dusan)
- Re: Is 1111 1110 10 equal to 0xfe80 or 0x3fa? Tom Herbert
- Re: Is 1111 1110 10 equal to 0xfe80 or 0x3fa? Yucel Guven
- Re: Is 1111 1110 10 equal to 0xfe80 or 0x3fa? Yucel Guven
- Re: Is 1111 1110 10 equal to 0xfe80 or 0x3fa? Yucel Guven
- RE: Is 1111 1110 10 equal to 0xfe80 or 0x3fa? Mudric, Dusan (Dusan)
- Re: Is 1111 1110 10 equal to 0xfe80 or 0x3fa? Yucel Guven
- IPv6 Link Local Addresses [was Re: Is 1111 1110 1… Bob Hinden
- RE: Is 1111 1110 10 equal to 0xfe80 or 0x3fa? Mudric, Dusan (Dusan)
- Re: Is 1111 1110 10 equal to 0xfe80 or 0x3fa? Erik Kline
- Re: IPv6 Link Local Addresses [was Re: Is 1111 11… Dennis Ferguson
- Re: Is 1111 1110 10 equal to 0xfe80 or 0x3fa? Ross Finlayson
- Re: Is 1111 1110 10 equal to 0xfe80 or 0x3fa? Ole Troan
- Re: IPv6 Link Local Addresses [was Re: Is 1111 11… Fred Baker
- Re: IPv6 Link Local Addresses [was Re: Is 1111 11… Dennis Ferguson
- Re: IPv6 Link Local Addresses [was Re: Is 1111 11… Ole Troan
- Re: IPv6 Link Local Addresses Alexandre Petrescu
- Re: IPv6 Link Local Addresses Kerry Lynn
- Re: IPv6 Link Local Addresses Erik Kline
- Re: IPv6 Link Local Addresses Brian E Carpenter
- Re: IPv6 Link Local Addresses [was Re: Is 1111 11… Gyan Mishra
- Re: IPv6 Link Local Addresses [was Re: Is 1111 11… Ole Troan
- Re: IPv6 Link Local Addresses [was Re: Is 1111 11… Gyan Mishra
- Re: IPv6 Link Local Addresses [was Re: Is 1111 11… Yucel Guven
- Re: IPv6 Link Local Addresses [was Re: Is 1111 11… Gyan Mishra
- Re: IPv6 Link Local Addresses [was Re: Is 1111 11… Mark Smith
- Re: IPv6 Link Local Addresses [was Re: Is 1111 11… Ola Thoresen
- Re: IPv6 Link Local Addresses [was Re: Is 1111 11… Yucel Guven
- Re: Is 1111 1110 10 equal to 0xfe80 or 0x3fa? Alexandre Petrescu
- Re: Is 1111 1110 10 equal to 0xfe80 or Alexandre Petrescu
- Re: 1111 1110 10 equals 0xfe80 to 0xfebf Alexandre Petrescu
- Re: Is 1111 1110 10 equal to 0xfe80 or 0x3fa? Alexandre Petrescu
- Re: Is 1111 1110 10 equal to 0xfe80 or... Alexandre Petrescu
- Re: Is 1111 1110 10 equal to 0xfe80 or 0x3fa? Alexandre Petrescu
- Re: Is 1111 1110 10 equal to 0xfe80 or 0x3fa? Alexandre Petrescu
- Re: Is 1111 1110 10 equal to 0xfe80 or 0x3fa? Alexandre Petrescu
- Re: IPv6 Link Local Addresses Alexandre Petrescu
- Re: IPv6 Link Local Addresses Alexandre Petrescu
- Re: Is 1111 1110 10 equal to 0xfe80 or 0x3fa? Warren Kumari
- Re: Is 1111 1110 10 equal to 0xfe80 or 0x3fa? Warren Kumari
- Re: Is 1111 1110 10 equal to 0xfe80 or 0x3fa? Sander Steffann
- Re: 1111 1110 10 equals 0xfe80 to 0xfebf Simon Hobson
- RE: Is 1111 1110 10 equal to 0xfe80 or 0x3fa? Manfredi (US), Albert E
- Re: IPv6 Link Local Addresses Gyan Mishra
- Re: IPv6 Link Local Addresses Gyan Mishra
- Re: correct Alexandre Petrescu