A tunnel is the medium that provide tunnelling, also known as "port forwarding".

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11answers
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What's a good SSH tunneling client for OS X?

I've using SSH Tunnel manager to easily set up and stop port tunneling over SSH to various servers at my company. That saved me the pain of opening up a new terminal window which will hang out there ...
10
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2answers
5k views

How to ensure that all traffic goes through VPN connection once it has been started?

I connect to the internet through a VPN provider along with other precautions in order to ensure privacy (against traffic analysis by agencies of a repressive government). I currently use Tunnelblick ...
5
votes
1answer
2k views

How does Back To My Mac work without UPnP or NAT-PMP?

Back To My Mac (BTMM) used to require UPnP or NAT-PMP on your router to work, but at some point this changed and it can work (albeit slowly) without those. BTMM (usually?) works by setting up an ...