Re: Broken IPv6 / IPv4 configuration, or Gmail brokenness?
On Sat, 28 Jan 2023 20:55:18 +0000
Andy Smith <andy@strugglers.net> wrote:
> Hi,
>
> On Sun, Jan 22, 2023 at 11:42:18PM -0500, Celejar wrote:
> > Shouldn't this be included somewhere prominently in the Debian
> > documentation, in the form of a Big Fat Warning that the standard
> > dual-stack condiguration used by Debian can cause serious breakage if
> > one's ISP doesn't support IPv6?
>
> Not having IPv6 is not the problem. As you discovered later in this
> thread, your ISP is providing just enough IPv6 for your router to
> think it has a v6 block to hand out, but not enough that it actually
> works. It's a misconfiguration by your ISP and not something that
> any operating system's documentation needs to point out. They could
> also let you connect to them but make IPv4 not work, it's just that
> you'd notice that very quickly!
Understood. There's apparently even a quasi-official name for this:
"IPv6 brokenness":
https://en.wikipedia.org/wiki/IPv6_brokenness_and_DNS_whitelisting
> In the field of IPv6 deployment, IPv6 brokenness was bad behavior seen
> in early tunneled or dual stack IPv6 deployments where unreliable or
> bogus IPv6 connectivity is chosen in preference to working IPv4
> connectivity. This often resulted in long delays in web page loading,
> where the user had to wait for each attempted IPv6 connection to time
> out before the IPv4 connection was tried. These timeouts ranged from
> being near-instantaneous in the best cases, to taking anywhere between
> four seconds to three minutes.
The article proceeds to assure the reader that:
> IPv6 brokenness is now generally regarded as a solved problem for
> almost all practical purposes, following improvements at both the
> transport and application layers.
But I guess I've managed to encounter a "practical" instance of
current IPv6 brokenness :|
...
> Anyway, if the ISP can't fix the IPv6 and can't be convinced to stop
> advertising it even when it doesn't work, I think you'd be best
Makes sense - I think I've seen other users of my ISP stating in online
forums that that's what they had to do at some point.
> off trying to disable radvd on the router. Failing that, disabling
> IPv6 on all your clients (check your phones too, as they will try
Thank you.
--
Celejar
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