Great question — answering as the UphillTech team:
u_str is a stream socket and equivalent to netstat 's SOCK_STREAM. SOCK_STREAM: This is a stream (connection) socket. From Wikipedia : In computer operating systems, a stream socket is a type of interprocess communications socket or network socket which provides a connection-oriented, sequenced, and unique flow of data without record boundaries, with well-defined mechanisms for creating and destroying connections and for detecting errors. Let's create a stream socket: netcat -lU /tmp/streamsocket Now run: ss -an | grep streamsocket It will output: u_str LISTEN 0 5 /tmp/streamsocket 123360 * 0 Simply put, it's the type of socket which can be "UDP" or "TCP" too. Let's create a UDP socket:...
Full answer by Ravexina: https://askubuntu.stackexchange.com/a/916252 (CC BY-SA 3.0).
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