I have a small network I help admin at a camp. I have OpenDNS set up for filtering purposes on a Windows Server 2008 SBS box. The camp uses a Sonicwall TZ200 firewall.
It has come to my attention that by changing the DNS settings on a device, OpenDNS can be bypassed, and the filtering neutralized.
Do I need to set up a rule in the Sonicwall to force OpenDNS or is there something I'm overlooking in Server 2008 in the DNS setup?