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I must be missing something - if the tunnel is only on the PC, and outwards it's just ipv4, how does the router know to route it back without some fkrwrding configuration?

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The other end of the tunnel knows how to reach your desktop, via the IPv4 address it has when the link was negotiated.

Just trust me, it works like magic :)

Oh man. "Any sufficiently advanced technology is indistinguishable from magic". I must understand this technology! Indeed sounds magical.

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