Port Blocking - DD-WRT Wiki
https://wiki.dd-wrt.com/wiki/index.php/Port_BlockingPort Blocking - Block a RANGE of users to port 21 (not available in most embedded builds): iptables -I FORWARD -s 192.168.1.1-192.168.1.101 -p tcp --dport 21 -j DROP Port Blocking - Block a RANGE of users to port 21 based upon a SUBNET: iptables -I FORWARD 1 -s 192.168.1.0/24 -p tcp --dport 21 -j DROP List iptables - List the rules in a chain ...