tcpdump Use reference card to identify fields IP Version 4 Header Length (Nr * 4B) 20:20:55.778140 IP dhcp-19-211.engr.scu.edu > Bobadilla.scu.edu: icmp 108: echo request seq 4864 4500 0080 0231 0000 8001 0d0f 81d2 13d3 81d2 13c6 0800 d5ee 0200 1300 6162 6364 6566 6768 696a 6b6c 6d6e 6f70 7172 7374 7576 7761 6263 6465 6667 6869 6a6b 6c6d 6e6f 7071 7273 7475 7677 6162 6364 6566 6768