This puzzle shows the issues with "Line of Sight." Wireless signals need to have a clear path to follow. Trees and a number of things will block the signal. You can go through some obstacles, but it is best to have a clear line of sight. To see the problem, try to ping google and the server from pc1. Then, move the wireless access-points to the window, where there is a clear line of sight beween the buildings. Line Of Sight 1024 1024 60 host 5 7.5 345 hints True False firewall0 60 175 670,200 firewall False False 192.168.5.1 0.0.0.0 0.0.0.0 gw lo lo0 175 176 firewall0 lo0 lo 176 False lo0 127.0.0.1 255.0.0.0 0.0.0.0 ip Untagged wan wan0 175 179 firewall0 wan0 wan 179 False wan0 192.168.5.2 255.255.255.0 0.0.0.0 ip Untagged eth eth0 175 177 firewall0 eth0 eth 177 False eth0 192.168.1.1 255.255.255.0 0.0.0.0 ip Untagged eth eth1 175 178 firewall0 eth1 eth 178 False eth1 0.0.0.0 0.0.0.0 0.0.0.0 ip Untagged google.com 60 190 330,50 server False False 8.8.8.1 0.0.0.0 0.0.0.0 gw lo lo0 190 191 server0 lo0 lo 191 False lo0 127.0.0.1 255.0.0.0 0.0.0.0 ip Untagged eth eth0 190 192 server0 eth0 eth 192 False eth0 8.8.8.8 255.255.255.0 0.0.0.0 ip Untagged net_switch0 60 132 110,690 net_switch False False 192.168.1.1 0.0.0.0 0.0.0.0 gw lo lo0 132 133 net_switch0 lo0 lo 133 False lo0 127.0.0.1 255.0.0.0 0.0.0.0 ip Untagged management_interface management_interface0 132 134 net_switch0 management_interface0 management_interface 134 False management_interface0 192.168.1.5 255.255.255.0 0.0.0.0 ip Untagged port port1 132 135 net_switch0 port1 port 135 False port1 0.0.0.0 0.0.0.0 0.0.0.0 ip Untagged port port2 132 136 net_switch0 port2 port 136 False port2 0.0.0.0 0.0.0.0 0.0.0.0 ip Untagged port port3 132 137 net_switch0 port3 port 137 False port3 0.0.0.0 0.0.0.0 0.0.0.0 ip Untagged port port4 132 138 net_switch0 port4 port 138 False port4 0.0.0.0 0.0.0.0 0.0.0.0 ip Untagged port port5 132 139 net_switch0 port5 port 139 False port5 0.0.0.0 0.0.0.0 0.0.0.0 ip Untagged port port6 132 140 net_switch0 port6 port 140 False port6 0.0.0.0 0.0.0.0 0.0.0.0 ip Untagged port port7 132 141 net_switch0 port7 port 141 False port7 0.0.0.0 0.0.0.0 0.0.0.0 ip Untagged net_switch1 60 142 736,649 net_switch False False 192.168.1.1 0.0.0.0 0.0.0.0 gw lo lo0 142 143 net_switch1 lo0 lo 143 False lo0 127.0.0.1 255.0.0.0 0.0.0.0 ip Untagged management_interface management_interface0 142 144 net_switch1 management_interface0 management_interface 144 False management_interface0 192.168.1.4 255.255.255.0 0.0.0.0 ip Untagged port port1 142 145 net_switch1 port1 port 145 False port1 0.0.0.0 0.0.0.0 0.0.0.0 ip Untagged port port2 142 146 net_switch1 port2 port 146 False port2 0.0.0.0 0.0.0.0 0.0.0.0 ip Untagged port port3 142 147 net_switch1 port3 port 147 False port3 0.0.0.0 0.0.0.0 0.0.0.0 ip Untagged port port4 142 148 net_switch1 port4 port 148 False port4 0.0.0.0 0.0.0.0 0.0.0.0 ip Untagged port port5 142 149 net_switch1 port5 port 149 False port5 0.0.0.0 0.0.0.0 0.0.0.0 ip Untagged port port6 142 150 net_switch1 port6 port 150 False port6 0.0.0.0 0.0.0.0 0.0.0.0 ip Untagged port port7 142 151 net_switch1 port7 port 151 False port7 0.0.0.0 0.0.0.0 0.0.0.0 ip Untagged net_switch2 60 283 736,279 net_switch False False 192.168.1.1 0.0.0.0 0.0.0.0 gw lo lo0 283 284 net_switch2 lo0 lo 284 False lo0 127.0.0.1 255.0.0.0 0.0.0.0 ip Untagged management_interface management_interface0 283 285 net_switch2 management_interface0 management_interface 285 False management_interface0 192.168.1.6 255.255.255.0 0.0.0.0 ip Untagged port port1 283 286 net_switch2 port1 port 286 False port1 0.0.0.0 0.0.0.0 0.0.0.0 ip Untagged port port2 283 287 net_switch2 port2 port 287 False port2 0.0.0.0 0.0.0.0 0.0.0.0 ip Untagged port port3 283 288 net_switch2 port3 port 288 False port3 0.0.0.0 0.0.0.0 0.0.0.0 ip Untagged port port4 283 289 net_switch2 port4 port 289 False port4 0.0.0.0 0.0.0.0 0.0.0.0 ip Untagged port port5 283 290 net_switch2 port5 port 290 False port5 0.0.0.0 0.0.0.0 0.0.0.0 ip Untagged port port6 283 291 net_switch2 port6 port 291 False port6 0.0.0.0 0.0.0.0 0.0.0.0 ip Untagged port port7 283 292 net_switch2 port7 port 292 False port7 0.0.0.0 0.0.0.0 0.0.0.0 ip Untagged pc0 60 109 40,630 pc False False 192.168.1.1 0.0.0.0 0.0.0.0 gw lo lo0 109 110 pc0 lo0 lo 110 False lo0 127.0.0.1 255.0.0.0 0.0.0.0 ip Untagged eth eth0 109 111 pc0 eth0 eth 111 False eth0 192.168.1.12 255.255.255.0 0.0.0.0 ip Untagged pc1 60 112 40,770 pc False False 192.168.1.1 0.0.0.0 0.0.0.0 gw lo lo0 112 113 pc1 lo0 lo 113 False lo0 127.0.0.1 255.0.0.0 0.0.0.0 ip Untagged eth eth0 112 114 pc1 eth0 eth 114 False eth0 192.168.1.13 255.255.255.0 0.0.0.0 ip Untagged pc2 60 115 826,549 pc False False 192.168.1.1 0.0.0.0 0.0.0.0 gw lo lo0 115 116 pc2 lo0 lo 116 False lo0 127.0.0.1 255.0.0.0 0.0.0.0 ip Untagged eth eth0 115 117 pc2 eth0 eth 117 False eth0 192.168.1.10 255.255.255.0 0.0.0.0 ip Untagged pc3 60 118 816,749 pc False False 192.168.1.1 0.0.0.0 0.0.0.0 gw lo lo0 118 119 pc3 lo0 lo 119 False lo0 127.0.0.1 255.0.0.0 0.0.0.0 ip Untagged eth eth0 118 120 pc3 eth0 eth 120 False eth0 192.168.1.11 255.255.255.0 0.0.0.0 ip Untagged router0 60 182 670,50 router False False 192.168.7.1 0.0.0.0 0.0.0.0 gw lo lo0 182 183 router0 lo0 lo 183 False lo0 127.0.0.1 255.0.0.0 0.0.0.0 ip Untagged eth eth0 182 184 router0 eth0 eth 184 False eth0 192.168.5.1 255.255.255.0 0.0.0.0 ip Untagged eth eth1 182 185 router0 eth1 eth 185 False eth1 192.168.7.2 255.255.255.0 0.0.0.0 ip Untagged router1 60 186 510,50 router False False 0.0.0.0 0.0.0.0 0.0.0.0 gw lo lo0 186 187 router1 lo0 lo 187 False lo0 127.0.0.1 255.0.0.0 0.0.0.0 ip Untagged eth eth0 186 188 router1 eth0 eth 188 False eth0 8.8.8.1 255.255.255.0 0.0.0.0 ip Untagged eth eth1 186 189 router1 eth1 eth 189 False eth1 192.168.7.1 255.255.255.0 0.0.0.0 ip Untagged 192.168.5.0 255.255.255.0 192.168.7.2 route server0 60 302 826,209 server False False 192.168.1.1 0.0.0.0 0.0.0.0 gw lo lo0 302 303 server0 lo0 lo 303 False lo0 127.0.0.1 255.0.0.0 0.0.0.0 ip Untagged eth eth0 302 304 server0 eth0 eth 304 False eth0 192.168.1.2 255.255.255.0 0.0.0.0 ip Untagged tree0 60 100 350,760 tree False False 0.0.0.0 0.0.0.0 0.0.0.0 gw lo lo0 100 101 tree0 lo0 lo 101 False lo0 127.0.0.1 255.0.0.0 0.0.0.0 ip Untagged eth eth0 100 102 tree0 eth0 eth 102 False eth0 0.0.0.0 0.0.0.0 0.0.0.0 ip Untagged tree1 60 103 390,610 tree False False 0.0.0.0 0.0.0.0 0.0.0.0 gw lo lo0 103 104 tree1 lo0 lo 104 False lo0 127.0.0.1 255.0.0.0 0.0.0.0 ip Untagged eth eth0 103 105 tree1 eth0 eth 105 False eth0 0.0.0.0 0.0.0.0 0.0.0.0 ip Untagged tree2 60 106 470,720 tree False False 0.0.0.0 0.0.0.0 0.0.0.0 gw lo lo0 106 107 tree2 lo0 lo 107 False lo0 127.0.0.1 255.0.0.0 0.0.0.0 ip Untagged eth eth0 106 108 tree2 eth0 eth 108 False eth0 0.0.0.0 0.0.0.0 0.0.0.0 ip Untagged tree3 60 225 320,660 tree False False 0.0.0.0 0.0.0.0 0.0.0.0 gw lo lo0 225 226 tree3 lo0 lo 226 False lo0 127.0.0.1 255.0.0.0 0.0.0.0 ip Untagged eth eth0 225 227 tree3 eth0 eth 227 False eth0 0.0.0.0 0.0.0.0 0.0.0.0 ip Untagged tree4 60 228 510,650 tree False False 0.0.0.0 0.0.0.0 0.0.0.0 gw lo lo0 228 229 tree4 lo0 lo 229 False lo0 127.0.0.1 255.0.0.0 0.0.0.0 ip Untagged eth eth0 228 230 tree4 eth0 eth 230 False eth0 0.0.0.0 0.0.0.0 0.0.0.0 ip Untagged wap0 60 121 650,650 wap False False 192.168.1.1 0.0.0.0 0.0.0.0 gw lo lo0 121 124 wap0 lo0 lo 124 False lo0 127.0.0.1 255.0.0.0 0.0.0.0 ip Untagged eth eth1 121 125 wap0 eth1 eth 125 False eth1 192.168.1.3 255.255.255.0 0.0.0.0 ip Untagged wport wport2 121 126 wap0 wport2 wport 126 False OfficeKey OfficeNet wport2 0.0.0.0 0.0.0.0 0.0.0.0 ip Untagged wport wport3 121 127 wap0 wport3 wport 127 False OfficeKey OfficeNet wport3 0.0.0.0 0.0.0.0 0.0.0.0 ip Untagged wport wport4 121 128 wap0 wport4 wport 128 False OfficeKey OfficeNet wport4 0.0.0.0 0.0.0.0 0.0.0.0 ip Untagged wport wport5 121 129 wap0 wport5 wport 129 False OfficeKey OfficeNet wport5 0.0.0.0 0.0.0.0 0.0.0.0 ip Untagged wport wport6 121 130 wap0 wport6 wport 130 False OfficeKey OfficeNet wport6 0.0.0.0 0.0.0.0 0.0.0.0 ip Untagged wport wport7 121 131 wap0 wport7 wport 131 False OfficeKey OfficeNet wport7 0.0.0.0 0.0.0.0 0.0.0.0 ip Untagged wbridge0 60 152 180,650 wbridge False False 192.168.1.1 0.0.0.0 0.0.0.0 gw lo lo0 152 155 wbridge0 lo0 lo 155 False lo0 127.0.0.1 255.0.0.0 0.0.0.0 ip Untagged wlan wlan1 152 156 wbridge0 wlan1 wlan 156 False OfficeKey OfficeNet wlan1 192.168.1.6 255.255.255.0 0.0.0.0 ip Untagged port port2 152 157 wbridge0 port2 port 157 False port2 0.0.0.0 0.0.0.0 0.0.0.0 ip Untagged port port3 152 158 wbridge0 port3 port 158 False port3 0.0.0.0 0.0.0.0 0.0.0.0 ip Untagged port port4 152 159 wbridge0 port4 port 159 False port4 0.0.0.0 0.0.0.0 0.0.0.0 ip Untagged port port5 152 160 wbridge0 port5 port 160 False port5 0.0.0.0 0.0.0.0 0.0.0.0 ip Untagged tree5 60 314 360,300 tree False False 0.0.0.0 0.0.0.0 0.0.0.0 gw lo lo0 314 315 tree5 lo0 lo 315 False lo0 127.0.0.1 255.0.0.0 0.0.0.0 ip Untagged eth eth0 314 316 tree5 eth0 eth 316 False eth0 0.0.0.0 0.0.0.0 0.0.0.0 ip Untagged tree6 60 317 470,290 tree False False 0.0.0.0 0.0.0.0 0.0.0.0 gw lo lo0 317 318 tree6 lo0 lo 318 False lo0 127.0.0.1 255.0.0.0 0.0.0.0 ip Untagged eth eth0 317 319 tree6 eth0 eth 319 False eth0 0.0.0.0 0.0.0.0 0.0.0.0 ip Untagged tree7 60 320 370,430 tree False False 0.0.0.0 0.0.0.0 0.0.0.0 gw lo lo0 320 321 tree7 lo0 lo 321 False lo0 127.0.0.1 255.0.0.0 0.0.0.0 ip Untagged eth eth0 320 322 tree7 eth0 eth 322 False eth0 0.0.0.0 0.0.0.0 0.0.0.0 ip Untagged tree8 60 323 450,410 tree False False 0.0.0.0 0.0.0.0 0.0.0.0 gw lo lo0 323 324 tree8 lo0 lo 324 False lo0 127.0.0.1 255.0.0.0 0.0.0.0 ip Untagged eth eth0 323 325 tree8 eth0 eth 325 False eth0 0.0.0.0 0.0.0.0 0.0.0.0 ip Untagged 142 150 net_switch1 port6 283 292 net_switch2 port7 net_switch1_link_net_switch2 normal 294 283 286 net_switch2 port1 175 177 firewall0 eth0 net_switch2_link_firewall0 normal 296 175 179 firewall0 wan0 182 184 router0 eth0 firewall0_link_router0 normal 247 190 192 server0 eth0 186 188 router1 eth0 google.com_link_router1 normal 193 132 135 net_switch0 port1 152 160 wbridge0 port5 net_switch0_link_wbridge0 normal 169 109 111 pc0 eth0 132 136 net_switch0 port2 pc0_link_net_switch0 normal 171 112 114 pc1 eth0 132 137 net_switch0 port3 pc1_link_net_switch0 normal 173 115 117 pc2 eth0 142 145 net_switch1 port1 pc2_link_net_switch1 normal 163 118 120 pc3 eth0 142 146 net_switch1 port2 pc3_link_net_switch1 normal 165 182 185 router0 eth1 186 189 router1 eth1 router0_link_router1 normal 249 121 125 wap0 eth1 142 151 net_switch1 port7 wap0_link_net_switch1 normal 167 283 287 net_switch2 port2 302 304 server0 eth0 net_switch2_link_server0 normal 306 152 156 wbridge0 wlan1 121 126 wap0 wport2 wireless 344 pc1 google.com SuccessfullyPings pc1 server0 SuccessfullyPings WirelessRepeater Grass rectangle 3, 7, 1013, 1004 Green Green LeftBldg rectangle 20, 170, 250, 700 SaddleBrown SaddleBrown RightBldg rectangle 650, 170, 250, 700 SaddleBrown SaddleBrown LB_RWall rectangle 255, 170, 15, 700 Gray Gray RB_RWall rectangle 650, 170, 15, 700 Gray Gray LB_TWall rectangle 20, 170, 15, 700 Gray Gray RB_TWall rectangle 885, 170, 15, 700 Gray Gray LB_BWall rectangle 20, 870, 250, 15 Gray Gray RB_BWall rectangle 650, 870, 250, 15 Gray Gray LB_LWall rectangle 20, 170, 250, 15 Gray Gray RB_LWall rectangle 650, 170, 250, 15 Gray Gray CenterCement rectangle 326, 200, 262, 377 Gray Gray CenterPark rectangle 359, 270, 188, 247 Green Green LWindow rectangle 260, 500, 5, 100 Blue Blue R_Window rectangle 655, 500, 5, 100 Blue Blue LSidewalk rectangle 255, 300, 100, 80 Gray Gray RSidewalk rectangle 550, 300, 100, 80 Gray Gray LDoor rectangle 255, 300, 10, 80 SaddleBrown SaddleBrown RDoor rectangle 655, 300, 10, 80 SaddleBrown SaddleBrown Default