[edit] Crap, I had a somewhat decent answer here (at least I thought so) and then re-read the orignal post and saw the dial-up portion of it, sorry... no help from here as I have no idea how to get a dial-up shared connection to work with the router.

As a thought, the router may be the problem and you might just want to be using a ethernet switch or the common side of the router (if it has a built in switch). The machine that is doing the dial-up is the connection point and the router will just get in the way of things.

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