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I have a Linksys and have been all through this same excercise. I traditionally simply forwarded Ports 21 and 20. Usually no problems, but sometimes people had trouble connecting. Recently I wanted to serve to some BetaOne members, so to assure easy connection I set DMZ. BUT, started getting adds on the screen from scanners.
So, going back to port forwarding and use a unique port number--not 21.
I read an faq once that said if you do this you should also open a series of ports in some high range not used by other internet services. Does this ring a bell to anyone?
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