1. Connect to the Management Interface.
Connect to the CLI with ssh using an IP address of any of the IP Interfaces, such as the default of 192.168.1.254. Alternatively you may use HyperTerm to connect directly to the serial console with the settings of 115200-8-N-1.
HyperTerm Serial port settings:
Once logged into the CLI then enter the configuration terminal.
Type "config terminal".
Disable External DNS which by default is receiving DNS settings from the ISP.
Type "dns use-external-dns disable".
Manually enter the IP Addresses of the servers OpenDNS provides.
Type “dns server x.x.x.x x.x.x.x x.x.x.x”.
DNS changes take effect instantly. You can type “show conf dns” to confirm your settings are correct.