Macosxhints: Use Apple Remote Desktop with Macs behind firewalls

This hint describes how to use Apple Remote Desktop (ARD) to connect to a Mac that is behind a residential gateway, or more generally, behind any device that is performing NAT or dropping the necessary TCP ports. The short version of this hint is this:
Have the target user ssh to you, with a remote port forward that connects an arbitrary TCP port (e.g. 5800) on your machine to port 5900 on their machine. Email them the command line entry to the user, since they probably aren’t ssh-savvy if you’re trying to ARD to them in the first place.

À essayer sur ma maman la prochaine fois qu’on essaye de faire des backups à 6000Km de distance.