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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

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