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It sounds like the main computer is set up to connect directly to the internet
through the modem.
This means it is assigning IP's to the other computers through DHCP.
The problem you are probably running into is that DHCP is enabled on
the router and is also trying to assign IP's to the computers.
You will need to go into the setup for the router and disable DHCP
and set all the computers to attain IP's automatically.
This way they will get the IP's from the main computer only.
Do not change settings on the main computer,it should be fine.
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