The IPv4 Total Length field defines the length of the IP header, valid data and data link padding.
ICMP is used as a messaging system for errors, alerts, and general notifications on an IP network.
Wireshark can import CSV (comma separated value) format files for further analysis.
Wireshark can be used to capture, reassemble and playback encrypted VoIP conversations.
The capture filter port 67 would capture all DHCP traffic seen by Wireshark.