Table of Contents
Was this article helpful?

4  out of  6 found this helpful

Try Vultr Today with

$50 Free on Us!

Want to contribute?

You could earn up to $600 by adding new articles.

Vultr Firewall Quickstart Guide

Author: David Finster

Last Updated: Wed, Apr 7, 2021
Quickstart Guides Security System Admin

Vultr Firewall has features comparable to many server operating system firewalls, with several key differences.

  • Packet filtering takes place at a higher level on the network, reducing resource usage of your server.

  • The firewall is managed through the Vultr control panel.

  • Updating the firewall policy for multiple servers is quick and convenient because Vultr Firewall groups can be applied to multiple servers.

Server instances can use the Vultr firewall or OS firewall, or both simultaneously. The diagram below illustrates the interaction between the Vultr firewall and the OS firewall. The three servers shown are linked to a single Vultr firewall, and each have their own respective OS firewalls.

As an internet user attempts to connect:

  • HTTP traffic in connection attempt 1 succeeds. Both the Vultr Firewall and the OS firewall are configured to pass HTTP.

  • SSH traffic in connection attempt 2 fails. The traffic passes successfully through the Vultr firewall, but is blocked by the OS firewall.

  • MySQL traffic in connection attempt 3 fails. The OS firewall is configured to pass MySQL traffic, but the traffic is blocked by the Vultr firewall which only allows HTTP and SSH.

Firewall connection example

Manage Firewall Rules

  • Click Firewall on your Vultr control panel.

  • Click the pencil icon to edit the firewall group.

Vultr dashboard example 1


Selecting the Cloudflare source will allow traffic from this list of Cloudflare IP addresses.

Screenshot of Firewall Rules highlighting Cloudflare

  • Click Linked Instances to view the linked servers.

  • Click the Unlink Instance icon to remove the server from the firewall group.

Vultr dashboard example 2

A Vultr cloud server can belong to one firewall group at a time.

Server Firewall Assignment

View a server's Vultr firewall assignment.

  • Select the server from your Vultr control panel.

  • Click Firewall on the left menu.

  • Click the Firewall dropdown to modify the server firewall group assignment.

Vultr dashboard example 3

API Access

The Vultr API offers several endpoints to manage the Vultr Firewall.

Firewall groups

Firewall rules

  • Get a firewall rule.

  • Create a rule for a firewall group.

  • Delete a firewall rule.

More Information

See the Vultr Firewall documentation for full details.

Want to contribute?

You could earn up to $600 by adding new articles.