DHCPv6 not working anymore

[stefan00]

Thank's - my Details looks different

This is not very helpful - can you post a screenshot?

For now - I got the problem that the radvd crashes.

You need Router Advertisements. Without at least one router delivering RAs (radvd), a IPv6 network cannot run properly.

Two short reads on it:

https://networkengineering.stackexchange.com/questions/82652/is-possible-to-use-dhcpv6-without-slaac

and with some more detail:

https://blogs.infoblox.com/ipv6-coe/why-you-must-use-icmpv6-router-advertisements-ras/

It would have been very helpful to know in the first place that your RA daemon is broken  ;)

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Bottom line:

(1) get Router Advertisements working on both of your interfaces (LAN networks)

(2) start with RA default settings, try RA mode "stateless" (I don't know that OPNsenses default setting is) and walk your way up from there as needed.

[Melroy vd Berg]

Thanks for documenting this in advance  :) This took me 2 days to figure out this missing setting.

OK, I documented it myself. Otherwise it will be forgotten. See PR: https://github.com/opnsense/docs/pull/646 Thank you!