Linux networking · Packet capture and firewall
Allow a port (ufw)
Allow incoming SSH. Allow SSH before enabling the firewall.
sudo ufw allow 22/tcp
Caution: Enabling a firewall without allowing SSH can lock you out of a remote server.
Official Linux networking documentation
More packet capture and firewall commands
- Capture traffic on an interface
- Capture traffic for a port
- Save a capture for Wireshark
- Show the firewall rules (ufw)
- Turn the firewall on (ufw)
- List nftables rules
All packet capture and firewall commands · Linux networking cheatsheet