IPv6

IPv6 is the newer version of the internet addressing system, designed to replace IPv4 with vastly more addresses and improved network behavior. Many ISPs and networks now support IPv6 by default, and devices may prefer it when available. For VPN users, IPv6 matters because an improperly configured VPN can protect IPv4 traffic while allowing IPv6 to bypass the tunnel, creating an “IPv6 leak.” Modern VPN clients handle this by tunneling IPv6 properly or disabling it safely to prevent bypass. Each approach has tradeoffs: tunneling preserves full IPv6 functionality, while disabling can be simpler but may reduce performance or break certain networks. Users should test IPv6 behavior while connected to ensure the visible IPv6 address belongs to the VPN exit rather than the ISP. IPv6 also interacts with DNS and WebRTC; the overall leak protection strategy must consider all layers. In DVPN designs, IPv6 tunneling can be more complex because exits may vary in IPv6 support; reputable clients should make these behaviors explicit. If you’re unsure, choose a VPN with a clear IPv6 policy and run leak tests periodically. IPv6 is not “bad”; it just requires correct VPN engineering.

Related DVPN Resources

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