ufw Command in Linux

Syntax of ufw Command in Linux

The basic syntax of the ufw command in Linux is as follows:

Where:

• options: These are optional arguments that modify the behavior of the ufw command. Examples include --dry-run, --verbose, etc.
• command: This is the action you want ufw to execute. Examples include enable, disable, status, allow, deny, etc.

Options in ufw Command in Linux

1. --dry-run: Displays what rules would be added or removed, but does not make any changes.

   For example -

   Output:

   This shows what would happen if the ufw was enabled but does not actually make any changes.

2. --verbose: Displays more information.

   For example -

   Output:

   This provides a more detailed status of the ufw.

3. --force: Force enable or disable of ufw, without asking for confirmation.

   For example -

   Output:

   This forcefully disables the ufw without any confirmation prompt.

Example Usages

• Enabling the ufw:

  Output:

  Explanation: This command enables the ufw on your system.

• Blocking an IP address:

  Output:

  Explanation: This command blocks all incoming traffic from the specified IP address.

Advanced Use Cases of ufw Command in Linux

• Allowing access to a specific port:

  Output:

  Explanation: This command allows all incoming traffic to port 22, commonly used for SSH.

• Limiting rate of incoming connections:

  Output:

  Explanation: This command limits the rate of incoming connections to the SSH port (usually port 22) to help prevent brute-force attacks.

• Allowing access from a specific network to a specific port:

  Output:

  Explanation: This command allows all incoming traffic to port 22 from the specified network.