tcpdump allows you to dump the traffic on a network. It can be used to print out the headers and/or contents of packets on a network interface that matches a given expression. You can use this tool to track down network problems, to detect many attacks, or to monitor the network activities.
0232231bb2f29d6bf2426e70a08a7e0c63a0d59a9b44863b7f5e2357a6e49fea