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Cake day: June 30th, 2023

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  • is kludging NAT for IPv6 not a better solution versus ULA addresses?

    There are very few hosts that allow only ipv6 (though there are many who only do ipv4). Ipv6 would improve internet stability and long-term communication when you’re not using a nat but that isn’t what you’re trying to build. Seeing as you’re not getting any advantage anyway I recommend ULA because it won’t get in the way of possible future migration to GUA ipv6 (globally unicast address) and still run over the ipv6 network while also avoiding Nat.

    Or is the clear answer just use IPv6 as intended and let the devices handle their privacy with IPv6 privacy extensions?

    It’s my clear answer at least.

    If you don’t want that you can use ULA addresses for now and later add GUA ipv6 addresses. ULAs are meant to be used when you only have a dynamic ipv6 prefix so that internal devices can have ipv6 internet (GUA) while also having a static ipv6 address(ULA).


  • Use ULA addresses for hosts inside your LAN, they are static, cannot be used to reach outside your LAN and use IPv6. Then give your server/VPN endpoint a real ipv6, that’s your VPN endpoint. This doesn’t require any nat and can be easily changed to GUA when you want to.

    CGnat is a “solution” for running out of ipv4 addresses, it has the same problems as any other nat but the problems are even more noticeable because the out-facing ipv4 address changes more often than the typical home nat configuration and tricks like FTP- and other helpers don’t work as well.

    Ipv6 would not only avoid the issues of cgnat, it would avoid cgnat entirely because you don’t need to Nat when you have enough ips.