Firewall

Structure

1. connection type: established, related, invalid, ...
2. protocol: udp, port: 53, ALLOW not from WAN
3. protocol: icmp, interface: WAN, ALLOW
4. port: winbox (8291), ALLOW from...
5. jump: internal input, internal forward, external input, external forward
6. chains: input, forward, DROP ALL (test rule, because all DROP rules should be in additional chains)
7. chains: internal input, internal forward, external input, external forward