Configure UFW on Ubuntu

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Installation of UFW

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UFW is already installed on Ubuntu 18.04. You can verify it from here

which ufw

Output:

root@vps:~# which ufw /usr/sbin/ufw

Enable/Disable/Reload UFW

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Enable UFW

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ufw enable

Disable UFW

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ufw disable

Reload UFW

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ufw reload

If you don’t receive output, you need to install UFW. Please refer the following commands.

sudo apt-get install ufw

Allow/Deny port

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Allow port

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ufw allow 80/tcp

Change the port which you want to open.

Deny port

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ufw deny 80

Change the port which you want to deny

Check Status of UFW

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ufw status

Listing Rules

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To list the rules which we have in UFW, run the following command.

ufw status numbered

Output:

root@vps:~# ufw status numbered Status: active

To Action From

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[ 1] 80/tcp ALLOW IN Anywhere [ 2] 80 DENY IN Anywhere [ 3] 80/tcp (v6) ALLOW IN Anywhere (v6) [ 4] 80 (v6) DENY IN Anywhere (v6)

Removing rules

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First, check the status of UFW using the following command.

ufw status numbered

Output:

root@vps:~# ufw status numbered Status: active

To Action From

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[ 1] 80/tcp ALLOW IN Anywhere [ 2] 80 DENY IN Anywhere [ 3] 80/tcp (v6) ALLOW IN Anywhere (v6) [ 4] 80 (v6) DENY IN Anywhere (v6)

This command will show the rules with numbers

Now remove the rule using the following command(Replace the 1 with the rule number which you want to remove)

ufw delete 1

Output:

root@vps:~# ufw delete 1 Deleting: allow 80/tcp Proceed with operation (y|n)? y Rule deleted root@vps:~#