Re: IPv6 network configuration

[Robert Elz <kre%munnari.OZ.AU@localhost>]

    Date:        Mon, 28 Sep 2020 10:20:31 +0200
    From:        =?UTF-8?Q?Milan_P=c3=a4ssler?= <milan%petabyte.dev@localhost>
    Message-ID:  <e2650180-581e-2529-341b-22eed40ce559%petabyte.dev@localhost>

  | -bash-5.0$ cat /etc/route.conf
  | inet 195.39.247.8 -static -link -iface vioif0
  | inet default 195.39.247.8
  | inet6 2a0f:4ac0::8 -static -link -iface vioif0
  | inet6 default 2a0f:4ac0::8

For IPv6 the router address should be the link local address of the
router (wherever you want your host to send packets for other than
directly attached links, or other known routes) - it needs to be
something that you can send to directly (kind of obviously, as its
job is to forward to other destinations).

The way you have it configured, your host has no idea how to send to
the 2a0f:4ac0::8 address, the only v6 addr it knows about is
inet6 2a0f:4ac0::17 prefixlen 128 alias and the /128 means that
that one address is the only one expected to exist on that link.

There's no way to work out how to get to the router's IP v6 addr.

Whatever reasons you think there are for your v6 config, you'll find
things work mush better if you configure things the way that the network
was always intended to be configured (which means having a separate
prefix for each link).   IPv4 ran out of addresses and has had to be
totally mangled to keep workable - don't copy the nightmares that have
been inflicted upon it into v6, where there is no need.

This doesn't mean that you need to use stateless autoconfig, v6 always
intended to allow that, and DHCP, and static config, as addr assignment
methods - you can use whatever of those works best for you, but the
network configured should be configured like a correct IP network once
all the addresses and routes are assigned, however that is achieved.

kre