Connecting 2 macs through the internet.

I have an imac in my home and a powermac in my girl's home, i want to be able to control the imac and vice versa. how can i achieve this? i have a speedtouch modem router in my home with the imac and a dlink in the other. i use 10.5.4. thanks in advance!

The security implications of this do need to be thought through. By advertising availability on common screen access ports (like 5900), you will be inviting a lot of additional "hack" traffic to your router.
You need to ensure that the screen sharing data is encrypted. There is a setting for this in the Screen Sharing preferences, although I am not entirely clear on what level of encryption that it uses when you enable it. Another approach is to use "ssh tunnelling" for the connection (This has the additional benefit of only requiring port 22 to be open on the firewall).
To keep the service running over time, you need to ensure that the port forwarding for each router is to a static ip address. Otherwise, when you disconnect and reconnect to the network, it is possible that your screen sharing setup will stop working.
A lot of this setup and effort can be avoided with a service like logmein (it takes care of the encryption, and avoids any need to reconfigure your router).
Cheers,
Rodney

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