Stopping Open DNS - FireBrick 105
In a factory state the Filters on a FireBrick 105 will not allow DNS to the FireBrick from the WAN - the default state is to block incoming traffic, but to allow outgoing traffic. However, in some cases, customers disable the firewall by adding a rule that allows all traffic in. In this case, a new rule is needed to block DNS to the FireBrick.
Create a Firewall filter to block port 53, from the WAN to the FireBrick, and make sure it's before any other rule that may allow this traffic in:
Name: BlockOpenDNS Source: WAN Target: FireBrick (The name of your FireBrick) Action: Drop Target ports: 53 Protocol: UDP
- Then re-test from the Control Pages: https://clueless.aa.net.uk/dnsresolvers.cgi