Re: Is 1111 1110 10 equal to 0xfe80 or 0x3fa?
Warren Kumari <warren@kumari.net> Sat, 15 June 2019 17:28 UTC
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From: Warren Kumari <warren@kumari.net>
Date: Sat, 15 Jun 2019 13:28:15 -0400
Message-ID: <CAHw9_iLmfv0zJEwn_0yHo5wi9Bj+S5huXzQ3DxvnXmDGMHcnFg@mail.gmail.com>
Subject: Re: Is 1111 1110 10 equal to 0xfe80 or 0x3fa?
To: Alexandre Petrescu <alexandre.petrescu@gmail.com>
Cc: Sander Steffann <sander@steffann.nl>, IPv6 <ipv6@ietf.org>
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' i On Sat, Jun 15, 2019 at 10:59 AM Alexandre Petrescu <alexandre.petrescu@gmail.com> wrote: > > > > Le 06/06/2019 à 22:17, Warren Kumari a écrit : > > On Thu, Jun 6, 2019 at 2:46 PM Sander Steffann <sander@steffann.nl> wrote: > >> > >> Hi Alexandre, > >> > >>> I maintain that 1111 1110 10 equals 0x3fa, because that's what my Windows Calculator says: I type 1111 1110 10 and it converts to 0x3fa. > >>> > >>> On another hand, I am rhetorically asked how can 1111 1110 10 be 0x3fa? > >>> > >>> (the 1111 1110 10 are the 10 leading bits of the IPv6 link local addresses, which is familiarly known to start with an fe80). > >>> > >>> On my side, this is a difficulty to understand this 0xfe80, especially since 1111 1110 10 is so printed in Figure in RFC4291. > >> > >> It's a prefix of an IPv6 address. IPv6 addresses are 128 bits long. Expand to 128 bits and try again :) > >> > >> 1111 1110 1000 0000 0000 0000 0000 0000 0000 0000 0000 0000 0000 0000 0000 0000 0000 0000 0000 0000 0000 0000 0000 0000 0000 0000 0000 0000 0000 0000 0000 0000 equals 0xfe800000000000000000000000000000. Not sure if Windows Calculator can handle that though… > > > > Windows calc probably can't, but: > > $ echo 'print hex(0b1111111010 << (128-10))' | python > > > > or https://repl.it/repls/AwareDecentGeeklog if you don't have Python > > (because windows :-p) > > For sake of completeness, google puts '1111111010 in hex' as 0x423A3562. Your point? One billion, one hundred and eleven million, one hundred and eleven thousand and ten is, in fact, 0x423A3562 In exactly the same way, if you enter '1+1' it gives you 2, and not 0b10. Perhaps you actually meant "0b1111111010 to hex", which it correctly converts to 0x3FA. A number of people have (in my opinion very politely) suggested that you spend some time reading up on subnetting. I'd second this recommendation, and suggest "Internet Routing Architectures" by Sam Halabi (http://www.ciscopress.com/store/internet-routing-architectures-9781578702336 ) - while it was written in 2000, and is focused on IPv4, the concept is *exactly* the same. I suspect that, at this point, I'm simply being trolled -- unfortunately though, as the Operations AD I often have to counter the accusation that the IETF is detached from operations and doesn't understand how protocols we design are used -- this thread fully plays into that. W > > qwant does not convert it. > > Alex > > > > > W > >> > >> Cheers, > >> Sander > >> > >> -------------------------------------------------------------------- > >> IETF IPv6 working group mailing list > >> ipv6@ietf.org > >> Administrative Requests: https://www.ietf.org/mailman/listinfo/ipv6 > >> -------------------------------------------------------------------- > > > > > > -- I don't think the execution is relevant when it was obviously a bad idea in the first place. This is like putting rabid weasels in your pants, and later expressing regret at having chosen those particular rabid weasels and that pair of pants. ---maf
- 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