This document introduces how to set up Firewall Filter Rules to block most of the LAN clients from the Internet, and allow only some IP to pass. To do this, it requires two Firewall FilterRules: one to block all the LAN client from the Internet, another to pass some IP for Internet access. (TIPS: Also use Bind-IP-to-MAC feature to give DHCP client a static IP)
1. Go Firewall >> Filter Setup >> Set 2 (Default Data Filter), click on an available index number to add new Filter Rules
2. Create a Firewall Rule that blocks all the LAN clients from the Internet:
3. Create a Firewall Rule that allows the specific IP address to the Internet:
Now we have two Filter Rules. Most of the packets will be blocked by Filter Rule 2 because they don't match the filtering conditions in Filter Rule3, and Filter Rule 3 will filter out the packets sourced from the specific IP range and pass to the Internet
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