Despite having RADVD selected for address type, rather than DHCPv6, my VR600 broadcasts occasional DHCPv6 messages that advertises itself as the DNS server on my network. So my clients end up sending DNS requests to the VR600 which I do not want to do any DNS as I have another server doing this.

If I have RADVD selected I shouldn't see ANY DHCPv6 traffic coming from my router, and certainly not traffic like this.

I guess this is just another bug to add to the long list for this firmware.