nanog mailing list archives
Re: IPv6 woes - RFC
From: Owen DeLong via NANOG <nanog () nanog org>
Date: Sat, 25 Sep 2021 14:31:39 -0700
On Sep 25, 2021, at 14:20 , Baldur Norddahl <baldur.norddahl () gmail com> wrote: On Sat, 25 Sept 2021 at 21:26, Owen DeLong via NANOG <nanog () nanog org <mailto:nanog () nanog org>> wrote: So the fact that: 2001:db8:0:1::5 2001:db8::1:0:0:0:5 Are two different ways of representing the same address isn’t of any concern unless you’re making the mistake of trying to string wise compare them in their text-representation format. Both equate to the same uint128_t value. If you adhere to RFC 5952 only the former is to be used (2001:db8:0:1::5). Also strict RFC 5952 on any output will make a string compare ok because there is only one way to print any address.
IIRC 5952 only specifies display, it does not control (and even if it purports to, depending users to comply is silly) user input.
We should remember there are also multiple ways to print IPv4 addresses. You can zero extend the addresses and on some ancient systems you could also use the integer value.
Truth.
You can even encounter IPv4 printed as IPv6 which is not too uncommon. Many programs internally are IPv6 only and IPv4 is therefore mapped to IPv6. It appears some people are forgetting this fact when proposing to drop IPv6.
Fair point. I think that ::ffff:1.2.3.4 is fine and I doubt it confuses anyone in IPv4 land much. Owen
Current thread:
- Re: IPv6 woes - RFC, (continued)
- Re: IPv6 woes - RFC Randy Bush (Sep 28)
- Re: IPv6 woes - RFC Victor Kuarsingh (Sep 28)
- Re: IPv6 woes - RFC Saku Ytti (Sep 28)
- Re: IPv6 woes - RFC Joe Maimon (Sep 24)
- Re: IPv6 woes - RFC Owen DeLong via NANOG (Sep 24)
- Re: IPv6 woes - RFC Owen DeLong via NANOG (Sep 24)
- Re: IPv6 woes - RFC borg (Sep 25)
- Re: IPv6 woes - RFC Baldur Norddahl (Sep 25)
- Re: IPv6 woes - RFC Owen DeLong via NANOG (Sep 25)
- Re: IPv6 woes - RFC Baldur Norddahl (Sep 25)
- Re: IPv6 woes - RFC Owen DeLong via NANOG (Sep 25)
- Re: IPv6 woes - RFC Valdis Klētnieks (Sep 25)
- Re: IPv6 woes - RFC James R Cutler (Sep 25)
- Re: IPv6 woes - RFC Andy Smith (Sep 25)
- Re: IPv6 woes - RFC Chris Adams (Sep 25)
- Re: IPv6 woes - RFC Masataka Ohta (Sep 26)
- Re: IPv6 woes - RFC Jim Young via NANOG (Sep 26)
- Re: IPv6 woes - RFC Nick Hilliard (Sep 26)
- Re: IPv6 woes - RFC Denys Fedoryshchenko (Sep 22)
- Re: IPv6 woes - RFC Tim Howe (Sep 18)
- Re: IPv6 woes - RFC Tim Howe (Sep 18)