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can ping router but no internet

on a 7/8 pc network, all ethernet and no wireless clients, d-link router/gateway. problem is with 2 of the clients they cannot connect to the internet or to the network application. all other clients are fine. from the 2 problematic pc's i can ping the router, i can connect to/log onto the router, but i cant ping www.google.com or connect to network application. i have tried disabling firewall and anti-virus with no joy.
Network OperationsNetworking Hardware-OtherWindows Networking

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Rob Williams
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Agree possibly DNS. Try browsing to Google or pining by IP 
Make sure the client machines pint only to your internal DNS server (assuming you have servers) and not the ISP even as an alternate.

Another thought is many commercial routers have # of connection limits with 10 being the entry level. If an outsider with a laptop connects it will remember that MAC address. Restarting the router resets the counter. However this would not affect internal connections.
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I've always thought that forcing (i.e. entering manually for the NIC) the DNS addresses in the IP configuration is a good idea for just this reason.  But, if the network is large then I can surely see why not!

The short-term reasoning is if you can't reach a remote name server then you don't have connectivity anyway.  If you don't have connectivity then connecting is already out of the question.

The long-term reasoning to counter that is: if the remote name servers IP addresses change then your system will be "incorrectly configured".  I find this rarely happens....  but, others may have other experience.  Surely not for large networks.
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Try clearing your winsock settings:

In command prompt type- netsh winsock reset
Windows Networking
Windows Networking

The Windows operating systems have distinct methodologies for designing and implementing networks, and have specific systems to accomplish various networking processes, such as Exchange for email, Sharepoint for shared files and programs, and IIS for delivery of web pages. Microsoft also produces server technologies for networked database use, security and virtualization.

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