Install a IPv6 tunnel (such as Sixxs) on your Raspberry Pi. You’ll now have a permanent static IPv6 address that will come online whenever your Pi is online. Make sure you secure your Pi as it’s connected to the world now.
If your B is connected to an IPv6 network, then connect directly to the Pi. If B is not connected to an IPv6 network, use C as a jump server, where you connect over IPv4 to C and then ssh over IPv6 from C to your Pi.
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