Pletes si WAN a LAN (za NATem). Ve WAN takhle:

IP address assigned by your ISP: 172.1.1.254
Subnet Mask : 255.255.0.0
Service Provider Gateway Address : 172.1.1.1
Nutno zadat DNS

Pro LAN nastav IP routeru napr. 192.168.1.1, SM 255.255.255.0 a The Gateway acts as DHCP Server (nebo podobne) na "Disabled".

Na vsech PC pak vypni DHCP a nastav: GW 192.168.1.1, SM 255.255.255.0, IP 192.168.1.x (x jako dalsi "ciselko" v poradi za routerem) a DNS (ktere jsi neuvedl).