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Re: Debian jessie > buster IPv6 link scope change of behaviour



On Wed, Jan 20, 2021 at 11:59:46PM -0600, David Wright wrote:
> As far as the address is concerned, fe80::1 is perfectly formed,
> but ambiguous. Is that what your jessie error message used to say?

The error was one of the usual kernel errors (-EINVALID probably), see
below.

Actually, stretch does the same (Linux ns2 4.9.0-14-amd64 #1 SMP Debian
4.9.246-2 (2020-12-17) x86_64 GNU/Linux):

root@ns2 ~ # ping6 fe80::1
connect: Invalid argument

root@ns2 ~ # ping6 fe80::1%2
PING fe80::1%2(fe80::1%eth0) 56 data bytes
64 bytes from fe80::1%eth0: icmp_seq=1 ttl=255 time=0.423 ms
64 bytes from fe80::1%eth0: icmp_seq=2 ttl=255 time=0.332 ms
64 bytes from fe80::1%eth0: icmp_seq=3 ttl=255 time=0.305 ms
64 bytes from fe80::1%eth0: icmp_seq=4 ttl=255 time=0.355 ms

fe80::1 is specifically a link-local scope, a bit like if you try to
access a class variable without telling in what class it is.


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