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ufw

ufw stands for Uncomplicated Firewall. It's like a wrapper for iptables, making the interaction easier.

Rules​

  • allow: allow traffic
  • deny: silently discard traffic
  • reject: reject traffic and send back an error packet to the sender
  • limit: limit connections from a specific IP address that has attempted to initiate 6 or more connections in the last 30 seconds

Syntax​

ufw [rule] [target]
ufw [rule] in [target]
ufw [rule] out [target]


Sample Commands​

ufw status
ufw enable

ufw status numbered
ufw delete 4  # delete rule based on rule index

ufw allow ssh
ufw allow 2222
ufw delete allow 2222

ufw allow 4422/tcp

ufw deny from 192.168.100.20


ufw reset

ufw default allow incoming
ufw default deny outgoing

ufw app list
ufw allow [App name]
ufw allow in OpenSSH
ufw limit OpenSSH

# Target Network Interface
ufw allow in on eth0 from 192.168.100.255

Reference​