Blending Innovation and Expertise in Computing – From Network Security to Software Development and 3D Printing https://laswitchtech.com/ 2026-04-04T22:58:26+00:00 https://laswitchtech.com/ https://laswitchtech.com/_media/wiki/logo.svg text/html 2025-09-18T00:33:34+00:00 Anonymous (anonymous@undisclosed.example.com) https://laswitchtech.com/en/projects/router-pi5/documentation/ipv4-rules?rev=1758155614&do=diff IPv4 Rules *filter :INPUT DROP [0:0] :FORWARD DROP [0:0] :OUTPUT ACCEPT [0:0] # Always allow loopback -A INPUT -i lo -j ACCEPT # Allow established/related to talk back in -A INPUT -m conntrack --ctstate ESTABLISHED,RELATED -j ACCEPT -A FORWARD -m conntrack --ctstate ESTABLISHED,RELATED -j ACCEPT # ICMP (ping) from LAN/DMZ (adjust to taste) -A INPUT -i br2 -p icmp -j ACCEPT -A INPUT -i br3 -p icmp -j ACCEPT -A INPUT -i br4 -p icmp -j ACCEPT # SSH to the router from LAN only (adjust/lock dow…