My router updated itself automatically to 184.108.40.206 the first time I switched it on. I have never had any problems with it at all since that time. I have also been reading the long thread about 220.127.116.11 and have decided not to try it out.
My DNS settings currently are
Domain Name Server (DNS) Address
Use These DNS Servers
Primary DNS 18.104.22.168
Secondary DNS 22.214.171.124