Stopping Open DNS - ZyXEL P660R-D1

The factory setting for this router is for DNS to be open on the WAN. This will be changed when configured by AAISP, but if it is configured from new, or reset, then WAN side DNS will need to be disabled. This can be done from the web interface, go to:

Advanced - Remote MGMT - DNS - LAN Only

Or from the CLI (telnet):

sys server load 
sys server access dns 2 
sys save

This also applies to the P-660HW-T1 v2 Router