Re: IPv6 network configuration

[Milan Pässler <milan%petabyte.dev@localhost>]

Adding a fixed link-local address to the router and using that as
gateway works fine.

Thanks for the detailed explanation,

- Milan

On 9/28/20 12:32 PM, Robert Elz wrote:
>     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
>