tcpdump Usage $ tcpdump Listens on default interface, dumps everything ping localhost ping remote machine $ tcpdump -i eth0 Listen on a specific interface $ tcpdump -vi eth0 Verbose mode $ tcpdump -vvi eth0 More verbose 19:54:09.884696 darkstar.digitalhermit.com > ns1.digitalhermit.com: icmp: echo request (DF) 19:54:09.884845 ns1.digitalhermit.com > darkstar.digitalhermit.com: icmp: echo reply T..