yes, that would be a very good solution/implementation

you have to adapt a few more things, if absolutely necessary it also works with several VRFs - but it is very ugly...

The following can be configured as a quick and dirty workaround:

Yes, radius is used for login.

@Viacheslav
I guess the logs are from the dhcp-server and not from the client...

@jack9603301 Below the desired information:

Sorry, I have forgotten to copy them.
the error does not occur with every query (nor as a supplement)

Further configurations and an overview via email

terminating watchfrr and pimd has solved the problem.
With my configuration everything was OK...

@christophedc0 Could you provide me with your pim configuration? i am not getting any further

Until version 1.3-rolling-202010280217 it still worked.
I have not changed the configuration...

now it works.
there seems to be another problem, the communication only works point to point, no routed traffic arrives on the opposite side.