this post was submitted on 24 Aug 2023
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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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[–] [email protected] 2 points 1 year ago

Just disable IPv6, if you don't wanna, try a configuration tool like PiVPN, which can setup wireguard automatically

[–] [email protected] 1 points 1 year ago (1 children)

I just disable ipv6 on my router to simply my firewall and such.... Won't use it until necessary

[–] [email protected] -1 points 1 year ago (1 children)

This is a real backwards approach to this.

[–] [email protected] 1 points 1 year ago (1 children)

Why? I don't miss anything

[–] [email protected] -2 points 1 year ago

You're missing a chance to help cool tech moving forward :)

[–] [email protected] 1 points 1 year ago

Wireguard easily supports dual stack configuration on a single interface, but the VPN server must also have IPv6 enabled. I use AirVPN and I get both IPv6 and IPv4 with a single wireguard tunnel. In addition to the ::/0 route you also need a static IPv6 address for the wireguard interface. This address must be provided to you by ProtonVPN.

If that's not possible, the only solution is to entirely disable IPv6.

[–] [email protected] 0 points 1 year ago (2 children)

The bad practise would be to entirely disable IPv6. #ShittySysAdmin

[–] [email protected] 0 points 1 year ago* (last edited 1 year ago)

Broke: disabling ipv6 because it's causing security holes with software not originally built for it

Woke: disabling ipv6 because hex ip strings are too hard to type

[–] [email protected] -1 points 1 year ago* (last edited 1 year ago)

IPv6 is broken by design /s.

[–] [email protected] 0 points 1 year ago* (last edited 1 year ago) (1 children)

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.

[–] [email protected] 1 points 1 year ago

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.

[–] [email protected] 0 points 1 year ago (1 children)

My ISP doesn't even support IPv6

[–] [email protected] -1 points 1 year ago

Time to get a better ISP

[–] [email protected] 0 points 1 year ago (1 children)

I use a magisk module to disable ipv6

[–] [email protected] -1 points 1 year ago (1 children)

decreasing security for a... privacy(?) increase 🤔

[–] [email protected] 1 points 1 year ago (1 children)

We're not talking about privacy in that context here

We're trying to patch a leaking ipv6 which I gave my solution to.

Don't use it if you don't like it lmao

[–] [email protected] -1 points 1 year ago (1 children)

I suppose but my point was that rooting your device decreases security immensely via crippling the android security model.

[–] [email protected] 2 points 1 year ago

That is true... but it's always about your threat model

Here, the ipv6 leaks are the priority