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What’s the use case?
The container connects to the VPN and only the VPN, now you can route whatever docker containers you want through that container as a network. Now that one VPN connection can serve any container you want.
That’s pretty cool. I might have to set it up this weekend.
There’s already a pretty recent post about this on the threadiverse. I recommend checking the discussion there as lots of us are not likely to repeat our comments.