linux-sockets-tools.md

Types of Sockets

• Stream sockets - TCP
• Datagram sockets - UDP
• Unix Domain sockets (UDS) - local, can be stream or datagram

Inspecting Sockets

Use the ss tool. Options:

ss -4 -tln

Options:

• 4 - IPv4 only
• t - tcp only
• l - listening only
• n - display port number

Connecting to Sockets

Use the nc tool:

nc -4 -vz 127.0.0.1 8080

Options:

• 4 - IPv4
• v - verbose
• z - connect only, don't send data