[Dnsmasq-discuss] DHCP packet received on enp6s0 which has no address

[Buck Horn]

On 04.01.24 09:46, Masin wrote:
> Hi Buck,
>
> thanks for your hints. Sadly, they don't work.
>
> 3. Januar 2024 18:48, "Buck Horn via Dnsmasq-discuss" <dnsmasq-discuss at lists.thekelleys.org.uk>
> schrieb:
> > (...)
> > Regarding your configuration: Did you try a configuration with just listen-address and bind-interfaces, without interface, no-dhcp-interface, and except-interface options?
> I try to avoid that because I want dnsmasq to bin to whatevet IPv6 address the container receives.
> I'm still new to IPv6 but I want to make it work in my local network. And as DHCPv6 seems to work
> quite different I don't know what address to expect for the container.
>
> But it's worth a try.
>
>> root at lan-basics:~# systemctl start dnsmasq.service
>> Job for dnsmasq.service failed because the control process exited with error code.
>> See "systemctl status dnsmasq.service" and "journalctl -xeu dnsmasq.service" for details.
>> root at lan-basics:~# cat /etc/dnsmasq.d/dns.conf
>> domain-needed
>> bogus-priv
>>
>> listen-address=10.23.40.53,fd00::2e2:69ff:fe61:fe9f
>>
>> log-queries=extra
>> cache-size=1000
>> dnssec
>>
>> no-resolv
>> #domain=wiedner.berlin
>> expand-hosts
>> no-negcache
>>
>> servers-file=/etc/dnsmasq.d/google.dns
>> #servers-file=/etc/dnsmasq.d/quad9.dns
>> conf-file=/usr/share/dnsmasq-base/trust-anchors.conf


That config is missing the suggested bind-interfaces option. ;)

As for DHCPv6:
It's probably a good idea to concern yourself with IPv6 only once IPv4
is working.
Most clients won't use DHCPv6 anyway.

IPv6 clients may join a network via SLAAC or Stateless or Stateful DHCPv6.

MacOS and Linux could do all three early on.
Windows preferred DHCPv6 for a long time, I believe supporting SLAAC
started with the introduction of Win8.1 or 10.
Android only does and only ever did SLAAC.

It's a client's OS (and its configuration, of course, as well as the
router configuration) that decides which mechanism is employed, but
there's a strong preference for SLAAC as a default.

You may even find out that you do not need DHCPv6 at all.