pc0 needs an IP that is local to the other two computers. Double-click PC0, double-click the IP-Address (0.0.0.0) and put a good IP address there. IP Puzzle 1024 1024 100 True 0 3 122 full net_switch0 100 100 426,306 net_switch False False 0.0.0.0 0.0.0.0 0.0.0.0 gw lo lo0 100 101 net_switch0 lo0 lo 101 False lo0 127.0.0.1 255.0.0.0 0.0.0.0 ip management_interface management_interface0 100 102 net_switch0 management_interface0 management_interface 102 False management_interface0 192.168.1.6 255.255.255.0 0.0.0.0 ip port port1 100 103 net_switch0 port1 port 103 False port1 0.0.0.0 0.0.0.0 0.0.0.0 ip port port2 100 104 net_switch0 port2 port 104 False port2 0.0.0.0 0.0.0.0 0.0.0.0 ip port port3 100 105 net_switch0 port3 port 105 False port3 0.0.0.0 0.0.0.0 0.0.0.0 ip port port4 100 106 net_switch0 port4 port 106 False port4 0.0.0.0 0.0.0.0 0.0.0.0 ip port port5 100 107 net_switch0 port5 port 107 False port5 0.0.0.0 0.0.0.0 0.0.0.0 ip port port6 100 108 net_switch0 port6 port 108 False port6 0.0.0.0 0.0.0.0 0.0.0.0 ip port port7 100 109 net_switch0 port7 port 109 False port7 0.0.0.0 0.0.0.0 0.0.0.0 ip pc0 100 110 110,306 pc False False 0.0.0.0 0.0.0.0 0.0.0.0 gw lo lo0 110 111 pc0 lo0 lo 111 False lo0 127.0.0.1 255.0.0.0 0.0.0.0 ip eth eth0 110 112 pc0 eth0 eth 112 False eth0 0.0.0.0 0.0.0.0 0.0.0.0 ip pc1 100 113 750,542 pc False False 0.0.0.0 0.0.0.0 0.0.0.0 gw lo lo0 113 114 pc1 lo0 lo 114 False lo0 127.0.0.1 255.0.0.0 0.0.0.0 ip eth eth0 113 115 pc1 eth0 eth 115 False eth0 192.168.1.3 255.255.255.0 0.0.0.0 ip pc2 100 116 762,97 pc False False 0.0.0.0 0.0.0.0 0.0.0.0 gw lo lo0 116 117 pc2 lo0 lo 117 False lo0 127.0.0.1 255.0.0.0 0.0.0.0 ip eth eth0 116 118 pc2 eth0 eth 118 False eth0 192.168.1.4 255.255.255.0 0.0.0.0 ip 100 103 net_switch0 port1 116 118 pc2 eth0 normal 119 100 104 net_switch0 port2 113 115 pc1 eth0 normal 120 110 112 pc0 eth0 100 105 net_switch0 port3 normal 121 pc0 pc1 NeedsLocalIPTo pc0 pc2 NeedsLocalIPTo IPAddress