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10.5: How to use ssh using 'Back to My Mac'
Authored by: sabi on May 01, '08 01:53:48AM
It's using a combination of IPsec (for the tunnel) and IPv6 (for routing), with UPnP or NAT-PMP to open a port if you're behind NAT. The IPsec connection is typically made over UDP port 4500 though if that port is in use, it will use another port.

The concept is really elegant and while the implementation was a bit flaky for a while, since 10.5.2 it's been basically reliable for me and it's so nice to no longer need to set up a VPN just to talk to my own machine at home.

You can see the IPsec configuration established by looking at the files in /etc/racoon/remote (you'll need to be root/use sudo to see them, since they contain a shared secret). You'll also find this shared secret in the System Keychain as "Back to My Mac key".

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