Update VPN Countries and IPv6 support

[kimg45]

Changes proposed in this PR:

• updated protonvpn countries
• added ipv6 support to ivpn with a disclaimer that you can't connect to it from an ipv6 address

closes #2448

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[jonaharagon]

Thanks for submitting!

However... I don't think #2448 is accurate, and therefore this isn't either. Mullvad is the only one which allows you to connect from an IPv6 network, which is what the section refers to. The behavior IVPN has is the opposite (allows IPv4 users to connect to IPv6 sites), so we're talking about two different things here.

[kimg45]

Removed the IPv6 part so it's just updating the server count now.

[dngray]

Mullvad is the only one which allows you to connect from an IPv6 network, which is what the section refers to.

Yes. This is correct. It is something you might want if you're on a provider that say only gives you a single IPv6 address which is something some cellular providers do with 464XLAT. Which means you avoid all this nonsense:

The client uses a SIIT translator to convert packets from IPv4 to IPv6. These are then sent to a NAT64 translator which translates them from IPv6 back into IPv4 and on to an IPv4-only server. The client translator may be implemented on the client itself or on an intermediate device and is known as the CLAT (Customer-side transLATor). The NAT64 translator, or PLAT (Provider-side transLATor), must be able to reach both the server and the client (through the CLAT). The use of NAT64 limits connections to a client-server model using UDP, TCP, and ICMP.

[privacyguides-bot]

This pull request has been mentioned on Privacy Guides. There might be relevant details there:

https://discuss.privacyguides.net/t/2024-04-08/17760/1