Capture traffic on interface

bash

sudo tcpdump -i eth0

Explanation

Start broad, then add host, port, or protocol filters.

Learn the surrounding workflow

Compare similar commands or jump into common fixes when this command is part of a bigger troubleshooting path.

Same sheet · prioritizing Traffic Capture and Firewall Inspection

Limit packet capture to a host and service port.

Open In sheetbashsame section

Inspect IPv4 firewall rules.

Open In sheetbashsame section

Inspect modern nftables configuration.

Open In sheetbashsame section

Inspect uncomplicated firewall state.

Open In sheetbashsame section

Inspect zones and allowed services.

Open In sheetbashsame section

List interfaces with addresses concisely.

Open In sheetbash1 tag match