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IPv4 is legacy technology and needs to be treated as such. I just wanted to VPN into my home network (headscale subnet router) when travelling and ended up with a subnet collision under IPv4. Obviously my IPv6 ULA has a very low chance of colliding and worked perfectly.

I wouldn't need a ULA if my ISP would just give me ipv6 addresses anyways but even with ULAs it's just very nice having them random so the collision chances are very low.

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