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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).

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What's the best way to prevent IPv6 from leaking when using Wireguard? (lemmy.world)

submitted 1 year ago by Molecular0079@lemmy.world to c/linux@lemmy.ml

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cross-posted from: https://lemmy.world/post/3754933

While experimenting with ProtonVPN's Wireguard configs, I realized that my real IPv6 address was leaking while IPv4 was correctly going through the tunnel. How do I prevent this from happening?

I've already tried adding ::/0 to the AllowedIPs option and IPv6 is listed as disabled in the NetworkManager profile.

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[–] dack@lemmy.world 2 points 1 year ago (1 children)

In this case, disabling IPv6 is actually the right move. If the VPN provider doesn't support IPv6, then there's no way to allow to allow IPv6 Internet traffic without causing a leak/VPN bypass. If you block IPv6 via firewall or routing it to a dead-end, it will add delays as things try IPv6, timeout, and fall back to IPv4. If you just remove the IPv6 address from the Internet interface, you have to also make sure it doesn't get re-added by SLAAC/DHCPv6 or other interface changes (switching wifi networks, etc). As dumb as it seems, disabling IPv6 or switching to a provider that supports it are probably the best options.

[–] p1mrx@sh.itjust.works 5 points 1 year ago* (last edited 1 year ago) (1 children)

In this case, disabling IPv6 is actually the right move. If the VPN provider doesn’t support IPv6, then there’s no way to allow to allow IPv6 Internet traffic without causing a leak/VPN bypass.

The right move for the VPN provider is to support IPv6. The right move for the user is to take their business to a provider that does.

[–] dack@lemmy.world 1 points 1 year ago

Yes, I agree - using a VPN that supports IPv6 is preferred. If they don't want to/can't change providers, then disabling IPv6 is the best way to prevent IPv6 leaks without negatively affecting network performance.