Firewall filtering rules in OpenWrt include:
1. Input Filtering Rules: Determine which packets can enter the home network through the router’s network interface, and which packets need to be blocked or discarded.
2. Output Filtering Rules: Determine which packets can leave the home network through the router’s network interface, and which packets need to be blocked or discarded.
3. Forwarding Filtering Rules: Determine whether packets can be forwarded from one network interface to another, and which packets need to be blocked or discarded.
4. NAT Rules: Convert private IP addresses in the internal network to public addresses.
5. QoS Rules: Define the priority and bandwidth limits for each host or application.
6. DHCP Rules: Limit the IP addresses of devices based on their MAC addresses.
7. IP Black/White Lists: Set restrictions or allow access through a specific IP address or range of addresses.
8. DNS Rules: Set DNS servers or local DNS caching, and intercept or filter specific DNS queries.
9. VPN Rules: Configure the router to use VPN services as a client or server.
10. DDoS Protection Rules: Use various protection tools to prevent distributed denial-of-service (DDoS) attacks on the network.