Two DHCP servers does cause difficult trouble shooting; nice work.
Yes - I guess I have set "authoritative" a long time ago, and forgot every thing about it. But I still does not understand, why it caused problems, when "ignore" was checked on lan.
I have reenabled ipv6 on lan on my main router, and it still works.
So thank you for your help.
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Because this ignores itself. Unless something is static, everything is still looking for the first DHCP server that answers its call.