this post was submitted on 24 Aug 2023
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Linux
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Linux is a family of open source Unix-like operating systems based on the Linux kernel, an operating system kernel first released on September 17, 1991 by Linus Torvalds. Linux is typically packaged in a Linux distribution (or distro for short).
Distributions include the Linux kernel and supporting system software and libraries, many of which are provided by the GNU Project. Many Linux distributions use the word "Linux" in their name, but the Free Software Foundation uses the name GNU/Linux to emphasize the importance of GNU software, causing some controversy.
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IPv4 and IPv6 are two different network stacks. Your IPv4 stack is hidden behind wireguard, but not the IPv6 one.
The correct way to fix your issue is to setup a second witeguard tunnel for IPv6, and route IPv6 traffic through it.
Edit: many comments advise to block outbound IPv6 traffic. Don't do that! It will add latency to all your requests as you will have to wait for them to timeout.
Unfortunately I can't change the tunnel as it is provided by ProtonVPN.
Apparently they advise to disable IPv6. I'm a bit disappointed 😞
If you disable IPv6 at the kernel level there's no extra latency as nothing even tries to connect to an IPv6 address. It's a shame to have to do it, but does fix the issue.
Disabling it is fine indeed, but I saw many comments advising to block outbound traffic, so I warned against that.