This step is optional, and you can skip it if necessary. I think it’s a good idea to disable IPv6 entirely unless you’re positive your provider supports it. Many VPN providers still don’t have adequate IPv6 support, which can cause data leaks and other issues. Once the commands have finished executing, you’re ready to get started setting up a VPN kill switch with UFW. Use the following commands to update your operating system and installed software: sudo apt update sudo apt upgrade -y As long as you’re using a Debian-based Linux operating system, the steps will be identical. I’ll be using Ubuntu 18 LTS for this guide. Before you beginīefore you get started, it’s a good idea to make sure your system is up to date. If you’ve ever struggled with Linux networking but still need a secure and user friendly firewall, I recommend UFW. UFW makes it much simpler to build a useful ruleset, especially if you’re not a Linux power user who knows iptables by heart. iptables is a powerful tool, but it’s not very easy to use. UFW is a set of scripts that act as a wrapper to the Linux iptables firewall. If you’ve ever kicked yourself for browsing while your VPN was down without even noticing, creating a VPN kill switch with UFW is a pretty easy fix. They’re completely automated, with the kill switch only kicking in when there’s a problem with your secure connection. A VPN kill switch is a set of firewall rules that will stop all internet traffic when your VPN isn’t connected.
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