Wireshark

Amazing tool that captures packets and disassembles them. Allows you to click an interactive tree that represents Ethernet, TCP/IP and application layer like HTTP.

Start capture immediately from CLI, capture packets to/from 192.168.1.102:

sudo wireshark -f 'host 192.168.1.102' -k

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Computer network software
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 Incoming links (3)

ICMP runs on top of IP
tcpdump
Tshark