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== Why using IPv4 & IPv6 with OpenVPN for this setup is discouraged. == Enabling both IPv4 and IPv6 may be the way to go for enterprise class connections. If you’re reading this, you might be stuck on horrible residential broadband & unable to pick a better ISP. In these environments, the 1% benefit IPv6 enables # '''NAT64/DNS64 Compatibility Issues''': Mobile networks often use NAT64/DNS64 for IPv6-only networks. This can clash with your VPN’s IPv6 routing, causing random failures. # '''Path MTU Discovery (PMTUD) Quirks''': IPv6 relies heavily on PMTUD. If there are issues along the path, you can have connectivity problems that are hard to diagnose. # '''ISP IPv6 Implementation''': Some ISPs (spectrum) can have less-than-great IPv6 implementations. This can lead to unstable connections when you’re trying to use both IPv4 and IPv6. # '''Dual-Stack Timeout Issues''': When both protocols are available, your devices might try connections on both. If IPv6 is unstable, you’ll experience timeouts and apparent connection failures. '''THIS MAKES UP FOR ANY & ALL POTENTIAL BENEFITS OF IPv6, WHICH YOU WILL NEVER NOTICE IN EVERYDAY USAGE.''' # '''Carrier-Grade NAT (CGN) Interactions''': The interplay between CGN for IPv4 and IPv6 routing through your VPN can lead to connection state inconsistencies. <span id="the-practical-solution"></span>
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