Linux Administration Cookbook

ss

The ss is great for local port checking, as I might have made obvious for the number of times we've used it throughout this book so far:

1. If you have a web server on your machine, and you know for a fact it should be running on port 80, you might find yourself using the fish arguments first, regardless:

$ ss -tunaNetid State Recv-Q Send-Q Local Address:Port Peer Address:Port udp UNCONN 0 0 *:733 *:* udp UNCONN 0 0 127.0.0.1:323 *:* udp UNCONN 0 0 *:68 *:* udp UNCONN 0 0 *:111 *:* udp UNCONN 0 0 :::733 :::* udp UNCONN 0 0 ::1:323 :::* udp UNCONN 0 0 :::111 :::* tcp LISTEN 0 128 *:111 *:* tcp LISTEN 0 128 *:22 *:* tcp LISTEN 0 100 127.0.0.1:25 *:* tcp ESTAB 0 0 10.0.2.15:22 10.0.2.2:51224 tcp LISTEN 0 128 :::111 :::* tcp LISTEN 0 128 :::22 ...