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In Linux, netstat and ss are two commands used to display network connections, routing tables, interface statistics and other related information.

1.netstat command

Display network connections, routing tables, and statistics interfaces

netstat

-a: All active connections and listening ports

-t: TCP port

-u: UDP port

-l: Listening status socket

-n: Display port number

-r: Display routing table

Example: #netstat -tunp

2.ss command

ss

-a: All active connections and listening ports

-t: TCP port

-u: UDP port

-l: Listening status socket

-n: World display port number

-r: Display routing table

-o: Display timer information

-p: Display process information

Summarize:

ss provides features that netstat does not have, with more concise output and better performance