Router advertisement advertises gateway address as dns server even if the dns forwarder is disabled
When using 6to4 on wan and assigning an interface tracking that, the radvd advertises the interface address as a dns server in the ra packet even if the dns forwarder is disabled. radvd cannot be configured anywhere to not solicit the other config dns information in this case and results in broken connectivity. Might affect other non-static configurations as well, but i cannot test those.
Expected behavior: when the dns forwarder is disabled the ra should not have other config flag with dns information in it, or the ability to specify the behavior of radvd on non-static interfaces as well.