Problem with TP-Link Routers

Hello. I'm facing some problems with my wireless router and 3desktop computers. The router is configured in my dad's computer. And I connected my computer with it using a cable in one of the router's lan ports. It works in my computer and I didn't use any IP address or DNS or anything in my computer. The internet works as soon as I connected it. But I did the same thing to my brother's computer connecting it with another cable but it doesn't work. It says that the connection is limited or something. I want to use the internet this way. So does my brother. I mean 2computers connected to another one. Could you please tell me what to do with it now? How can I make it work? Please tell me the step by step methods of doing it. It will be very much appreciated.


Thanks & Best Regards.

Zaker