Rigging Plan For Optimist Dinghy Tips On Rigging Up An Old Computer To Serve As A Firewall?

Tips on rigging up an old computer to serve as a firewall? - rigging plan for optimist dinghy

Well, I plan to connect 2 computers together and leads all the files on my slow computer with an impressive security system on my computer to quickly navigate through a single port instead of 65000 ports.

Any tips on how to achieve this goal? I've never done before, but I have a thorough knowledge of the material.