[Bug 3781] IPv6 inconsistency causes TOFU

[bugzilla-daemon at mindrot.org]

https://bugzilla.mindrot.org/show_bug.cgi?id=3781

--- Comment #5 from sshbugs.to.davies at spamgourmet.com ---
> Is the debug trace an example of this?
Yes.

> What was in known_hosts when you generated the trace?
As stated in my original report, but repeated for convenience with
anonymisation retained:
C:\Users\Administrator>cat \cwrsync_6.3.0_x64_free\known_hosts
@cert-authority
*.lan.xxxxxxxxxxxxxx,192.168.51.*,192.168.1.*,192.168.13.*,xxxx:yyyy:zzzz:0:*
ssh-ed25519
asdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdf
host_ca.pub

> What sort of addresses does this fail for?
IPv6 addresses of the form xxxx:yyyy:zzzz::anything.

> Also, what do you mean by "addresses that are generated dynamically" ?
Addresses generated by DHCP6, as ULAs or by similar processes;
addresses that are not static and therefore may contain any unique
value in the last 64 bits.

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