Please correct me if I am wrong, if your inquiry is regarding the modem's DNS settings you can log in to the modem's config using info from <insert community link> , go to advance>Network>LAN Settings> Make sure the primary and secondary DNS is blank. I hope it helps.
Let us know if you have further query.
Updating the LAN DNS does change the Network status DNS values, as my modem appears to take its these from the EWAN settings. I am thinking it maybe due to the fact that the setup is HFC, and that the vr1600 connects to a HFC modem - i wonder if the HFC modem is where the network status DNS values are stored - and hence why updating the vr1600 LAN DNS settings does not affect these DNS settings.