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I already have a Windows 7 PC connected to my NETGEAR WGR614v10 router and I am able to use internet in that computer.

Now I need to connect one of my old computer to the router to share the internet. It's also running Windows 7. I already connected it to the router via a CAT-5 cable but I am not able to use internet.

The first computer was set up by a technician. Its IP address is 192.168.1.3, and the default gateway is 192.168.1.1. On the second PC, I changed the IPv4 to 192.168.1.4 and default gateway and preferred DNS to 192.168.1.1, but it's not working.

What can I do?

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And, does it work? Basically, you'll just have to copy the settings of the first machine and choose a slightly different IP address (i.e. where the last number is different and not the same as the gateway). –  slhck Nov 4 '12 at 15:58
    
No it is not working :(, do I have to access the router by typing 192.168.1.1 in a browser? –  Call Me Dummy Nov 4 '12 at 15:59
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You should, yes. I edited your question with what we know so far and removed a few comments. Maybe you can make screenshots of your connection Details of both machines and paste the links to them in your question. I'm out of ideas now, though. –  slhck Nov 4 '12 at 16:07
    
See if you can ping the gateway, if not ping the local loopback of 127.0.0.1. If loopback works but gateway doesnt check your cable (might be a crossover) and port. –  iivel Nov 4 '12 at 16:12
    
Copy most of the Internet Protocol (TCP/IP) properties for the Local Area Connection from the working computer to the old one -- i.e. Subnet mask, Default gateway, DNS server addresses (or Obtain DNS server address automatically). –  martineau Nov 4 '12 at 16:15
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