There may be several reasons for that.
Right now, it comes to my mind:
1) Your upstream provider IPv6 connectivity is not able to reach the IETF upstream provider with IPv6.
2) The latency of IPv6 is higher than the IPv4 one.
In those cases, happy eyeballs will prefer IPv4 so you will get IPvfoo extension showing IPv4 as preferred, but if you click, you can still see both the IPv4 and IPv6 addresses as provided by the DNS resolution.
Unfortunately, I've seen way too many ISPs that don't monitor IPv6 with the same degree of quality as IPv4, they rely on customers complains which don't happen because happy eyeballs ...
Regards,
Jordi
@jordipalet
El 9/3/21 21:52, "ietf en nombre de Baird, John M CTR OSD HPCMP (USA)" <ietf-bounces@xxxxxxxx en nombre de john.m.baird10.ctr=40mail.mil@xxxxxxxxxxxxxx> escribió:
Brian,
Thanks for the quick response. You mention the Firefox "six or not" extension, and that is why I asked the question about IPv6 and IETF websites.
When I browse the websites you cited, and also https://tools.ietf.org, IPvFoo lists several IPv4 addresses, but makes no mention of any IPv6 addresses.
I can see the IPv6 addresses in DNS, but for some reason IPvFoo reports that the websites respond to web browsers only via IPv4.
Any theories as to why this is so?
John
-----Original Message-----
From: Brian E Carpenter <brian.e.carpenter@xxxxxxxxx>
Sent: Monday, March 8, 2021 10:57 PM
To: Baird, John M CTR OSD HPCMP (USA) <john.m.baird10.ctr@xxxxxxxx>
Cc: ietf@xxxxxxxx
Subject: [Non-DoD Source] Re: question: are the various IETF web sites IPv6 enabled? If not, why not?
----
On 09-Mar-21 16:30, John Levine wrote:
> In article <4CC47F19-3063-430F-8378-B00EB7E2708F@xxxxxxxxx> you write:
>> -=-=-=-=-=-
>>
>> It is my understanding that they all are, and have been for some
>> time. I might suggest that you ping6 (or ping -6 depending on your OS) to see whether you get a response.
>
> Yes, they all are. The mail is, too.
Caution-https://www.irtf.org/ too.
Caution-https://www.rfc-editor.org/ too.
Caution-https://www.internetsociety.org/ too.
The "six or not" FireFox extension tells me that the ISOC site invokes a couple of IPv4 services, so needs dual stack. The IETF site is clean in that regard.
Brian
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