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From: Marc Haber <mh+usenetspam1118@zugschl.us>
Newsgroups: comp.os.linux.misc
Subject: Re: Anybody Using IPv6?
Date: Wed, 21 May 2025 17:19:59 +0200
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vallor <vallor@cultnix.org> wrote:
>His address is:
>
>] inet6 fc00::16  prefixlen 64  scopeid 0x0<global>

I read that as a misconfiguration.

I have never used ifconfig with IPv6 on Linux. I misread that as
"fc00::/16" and discarded it as rubbish. That it actually means
fc00::16/64 only occurred to me after you pointed me towards it.

That being said, the address range fc00::/8 is currently not in use as
par the RFCs. fc00::/7 is reserved for unique local addresses, but
that is currently only defined for fd00::/8, as with bit 8 set to 1.
We are seeing a non-RFC-conformant misconfiguration here.

As with a normally routed address, having this configured should not
hurt at all for out-of-prefix addresses (such as everything on the
global internet) since the network should quickly generate a host
unreachable message even if a default route is present on the system.

Greetings
Marc
-- 
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Marc Haber         |   " Questions are the         | Mailadresse im Header
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