Can't share dialup via ethernet

Unfortionatly I had to switch back to dial-up and thought I could share the dialup internet from my router. My dad's emac has a dialup modem, but my pc and future mac-pro will not have modems, and I am moving out in a couple months so I don't want to drop $100 on modems.

Tried to set up emac:
Manual IP's (and tried DCHP)
Filesharing and windows sharing is on
No firewalls, hardware or software for troubleshooting
Setup internet sharing to share from modem to ethernet
Plugged emacs ethernet cable into router uplink, and tried port 4
All other computers are on 1,2,3, ports

Clients:
Set manual IP, and tried DCHP
can ping and connect to each other and router, can only ping and connect to emac when emac is pluged into port 4 not uplink.

Won't work on Mac to pc or even Mac to Mac via ethernet.

I have shared internet from my MBP to my pc via firewire....didn't think this would be so hard.

What can I do

 

Oh forgot to add in the sharing preferances under windows sharing it has this:

And for File sharing has this...

Not sure what it is or why it replaced my old IP address??? cant find any setting linked to that. Could this be a problem?

And the emac is on 10.3 if that helps

 

Any Idea's I've been banging my head against the wall to try and get this thing working

 

Nope, i'll try that.....man this dialup speed is KILLING ME!!!!...cant wait for an appartment with broadband

 

I finally got it working

I had to disable the dhcp on the router and then give the mac a static IP with DCHP and then set the mac mini / XP machines to DCHP and then everything just worked. Not really sure why though, it gave it 192.168.2.x while my emac was 192.168.1.x , then another time it assigned it something like 236.xxx.x.x , something off the wall and that worked as well....not sure why though???

I know one thing if you set them to like 192.168.1.x and set the last digit to anything it will not take it.

anyway I guess the good thing is that its working....however osx is handling it