Packets can be partially corrupted by lights. Look at how the packet goes the first time. Move the light out of the way just a little bit and it should work fine. Packet Corruption2 1024 1024 100 False 0 7 163 full net_switch0 100 112 109,397 net_switch False False 192.168.1.1 255.255.255.0 0.0.0.0 gw lo lo0 112 113 net_switch0 lo0 lo 113 False lo0 127.0.0.1 255.0.0.0 0.0.0.0 ip management_interface management_interface0 112 114 net_switch0 management_interface0 management_interface 114 False management_interface0 192.168.1.4 255.255.255.0 0.0.0.0 ip port port1 112 115 net_switch0 port1 port 115 False port1 0.0.0.0 0.0.0.0 0.0.0.0 ip port port2 112 116 net_switch0 port2 port 116 False port2 0.0.0.0 0.0.0.0 0.0.0.0 ip port port3 112 117 net_switch0 port3 port 117 False port3 0.0.0.0 0.0.0.0 0.0.0.0 ip port port4 112 118 net_switch0 port4 port 118 False port4 0.0.0.0 0.0.0.0 0.0.0.0 ip port port5 112 119 net_switch0 port5 port 119 False port5 0.0.0.0 0.0.0.0 0.0.0.0 ip port port6 112 120 net_switch0 port6 port 120 False port6 0.0.0.0 0.0.0.0 0.0.0.0 ip port port7 112 121 net_switch0 port7 port 121 False port7 0.0.0.0 0.0.0.0 0.0.0.0 ip net_switch1 100 122 736,397 net_switch False False 192.168.2.1 255.255.255.0 0.0.0.0 gw lo lo0 122 123 net_switch1 lo0 lo 123 False lo0 127.0.0.1 255.0.0.0 0.0.0.0 ip management_interface management_interface0 122 124 net_switch1 management_interface0 management_interface 124 False management_interface0 192.168.2.4 255.255.255.0 0.0.0.0 ip port port1 122 125 net_switch1 port1 port 125 False port1 0.0.0.0 0.0.0.0 0.0.0.0 ip port port2 122 126 net_switch1 port2 port 126 False port2 0.0.0.0 0.0.0.0 0.0.0.0 ip port port3 122 127 net_switch1 port3 port 127 False port3 0.0.0.0 0.0.0.0 0.0.0.0 ip port port4 122 128 net_switch1 port4 port 128 False port4 0.0.0.0 0.0.0.0 0.0.0.0 ip port port5 122 129 net_switch1 port5 port 129 False port5 0.0.0.0 0.0.0.0 0.0.0.0 ip port port6 122 130 net_switch1 port6 port 130 False port6 0.0.0.0 0.0.0.0 0.0.0.0 ip port port7 122 131 net_switch1 port7 port 131 False port7 0.0.0.0 0.0.0.0 0.0.0.0 ip pc0 100 106 103,530 pc False False 192.168.1.1 255.255.255.0 0.0.0.0 gw lo lo0 106 107 pc0 lo0 lo 107 False lo0 127.0.0.1 255.0.0.0 0.0.0.0 ip eth eth0 106 108 pc0 eth0 eth 108 True eth0 192.168.1.5 255.255.255.0 192.168.1.1 route pc1 100 109 610,513 pc False False 192.168.2.1 255.255.255.0 0.0.0.0 gw lo lo0 109 110 pc1 lo0 lo 110 False lo0 127.0.0.1 255.0.0.0 0.0.0.0 ip eth eth0 109 111 pc1 eth0 eth 111 False eth0 192.168.2.3 255.255.255.0 0.0.0.0 ip pc2 100 152 212,530 pc False False 192.168.1.1 0.0.0.0 0.0.0.0 gw lo lo0 152 153 pc2 lo0 lo 153 False lo0 127.0.0.1 255.0.0.0 0.0.0.0 ip eth eth0 152 154 pc2 eth0 eth 154 False eth0 192.168.1.3 255.255.255.0 0.0.0.0 ip pc3 100 155 733,516 pc False False 0.0.0.0 0.0.0.0 0.0.0.0 gw lo lo0 155 156 pc3 lo0 lo 156 False lo0 127.0.0.1 255.0.0.0 0.0.0.0 ip eth eth0 155 157 pc3 eth0 eth 157 True eth0 192.168.2.5 255.255.255.0 192.168.2.1 route router0 100 132 112,260 router False False 192.168.3.2 255.255.255.0 192.168.4.2 gw lo lo0 132 133 router0 lo0 lo 133 False lo0 127.0.0.1 255.0.0.0 0.0.0.0 ip eth eth0 132 134 router0 eth0 eth 134 False eth0 192.168.1.1 255.255.255.0 0.0.0.0 ip eth eth1 132 135 router0 eth1 eth 135 False eth1 192.168.3.1 255.255.255.0 0.0.0.0 ip 192.168.2.1 255.255.255.0 192.168.3.2 route 192.168.2.1 255.255.255.0 192.168.3.2 route router1 100 136 736,257 router False False 192.168.4.2 255.255.255.0 192.168.4.2 gw lo lo0 136 137 router1 lo0 lo 137 False lo0 127.0.0.1 255.0.0.0 0.0.0.0 ip eth eth0 136 138 router1 eth0 eth 138 False eth0 192.168.4.1 255.255.255.0 0.0.0.0 ip eth eth1 136 139 router1 eth1 eth 139 False eth1 192.168.2.1 255.255.255.0 0.0.0.0 ip 192.168.1.0 255.255.255.0 192.168.4.2 route 192.168.1.0 255.255.255.0 192.168.4.2 route router2 100 140 403,110 router False False 0.0.0.0 0.0.0.0 0.0.0.0 gw lo lo0 140 141 router2 lo0 lo 141 False lo0 127.0.0.1 255.0.0.0 0.0.0.0 ip eth eth0 140 142 router2 eth0 eth 142 False eth0 192.168.3.2 255.255.255.0 0.0.0.0 ip eth eth1 140 143 router2 eth1 eth 143 False eth1 192.168.4.2 255.255.255.0 0.0.0.0 ip 192.168.1.0 255.255.255.0 192.168.3.1 route 192.168.2.0 255.255.255.0 192.168.4.1 route 192.168.1.0 255.255.255.0 192.168.3.1 route 192.168.2.0 255.255.255.0 192.168.4.1 route server0 100 100 8,520 server True True 192.168.1.1 255.255.255.0 0.0.0.0 gw lo lo0 100 101 server0 lo0 lo 101 False lo0 127.0.0.1 255.0.0.0 0.0.0.0 ip eth eth0 100 102 server0 eth0 eth 102 False eth0 192.168.1.2 255.255.255.0 0.0.0.0 ip 127.0.0.1 0.0.0.0 0.0.0.0 route 192.168.1.2 192.168.1.5 192.168.1.7 route server1 100 103 862,520 server False True 192.168.2.1 255.255.255.0 0.0.0.0 gw lo lo0 103 104 server1 lo0 lo 104 False lo0 127.0.0.1 255.0.0.0 0.0.0.0 ip eth eth0 103 105 server1 eth0 eth 105 False eth0 192.168.2.2 255.255.255.0 0.0.0.0 ip 127.0.0.1 0.0.0.0 0.0.0.0 route 192.168.2.2 192.168.2.5 192.168.2.10 route fluorescent0 100 160 600,90 fluorescent False False 0.0.0.0 0.0.0.0 0.0.0.0 gw lo lo0 160 161 fluorescent0 lo0 lo 161 False lo0 127.0.0.1 255.0.0.0 0.0.0.0 ip eth eth0 160 162 fluorescent0 eth0 eth 162 False eth0 0.0.0.0 0.0.0.0 0.0.0.0 ip 100 102 server0 eth0 112 115 net_switch0 port1 normal 144 140 143 router2 eth1 136 138 router1 eth0 normal 148 109 111 pc1 eth0 122 127 net_switch1 port3 normal 151 103 105 server1 eth0 122 126 net_switch1 port2 normal 150 136 139 router1 eth1 122 125 net_switch1 port1 normal 149 152 154 pc2 eth0 112 118 net_switch0 port4 normal 159 132 135 router0 eth1 140 142 router2 eth0 normal 147 112 117 net_switch0 port3 132 134 router0 eth0 normal 146 106 108 pc0 eth0 112 116 net_switch0 port2 normal 145 155 157 pc3 eth0 122 128 net_switch1 port4 normal 158 pc2 pc1 SuccessfullyPings PacketCorruption