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Last Modified: 2014-12-12
Hi Experts,

I have a simple network topology: router which goes to a switch with multiple computers.

Some computers have network access, some dont. Even the computer that is directly connected to the router does not have network access.

What could it be?
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JohnBusiness Consultant (Owner)
Most Valuable Expert 2012
Expert of the Year 2018

Commented:
Are the network cables and connections good?

On one problem computer reset TCP/IP, restart and test

Open cmd.exe with Run as Administrator
Then  netsh int ip reset c:\resetlog.txt
Restart the computer
Remake wireless profiles as needed

Also, ipconfig /flushdns followed by net stop dnscache followed by net start dnscache
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Fred MarshallPrincipal
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APD TorontoSoftware Developer

Author

Commented:
I forgot to mention all computers that lost network, lost it at the same time. Could it be the router .

Maybe 5 of 12 computers lost access .
JohnBusiness Consultant (Owner)
Most Valuable Expert 2012
Expert of the Year 2018

Commented:
It could be the router or the switch. Try resetting both by turning off and turning back on after waiting 30 seconds.
APD TorontoSoftware Developer

Author

Commented:
I have reserved specific IPs for each computer on the router.
JohnBusiness Consultant (Owner)
Most Valuable Expert 2012
Expert of the Year 2018

Commented:
You would be better off with DHCP, I think. I stopped using workstation static IP a couple of decades ago.

The router could have gotten mixed up and therein your issue. Make one computer DHCP and see.
Fred MarshallPrincipal
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Commented:
As I suggested earlier, use DHCP and work through the computers one at a time.
I did not anticipate that you had set up reserved IP addresses on the router DHCP.
While that's fine, I would strongly suggest you forego that nicety while troubleshooting this issue.
APD TorontoSoftware Developer

Author

Commented:
With A PC directly connected to the router, I ger

PING: transmit failed. General failure.
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Fred MarshallPrincipal
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Commented:
What is the result of ipconfig when it's connected that way?
This sounds more like an issue on the PC.
JohnBusiness Consultant (Owner)
Most Valuable Expert 2012
Expert of the Year 2018

Commented:
I'm not sure why so many problem computers if it is a PC problem. It could be a virus outbreak.
APD TorontoSoftware Developer

Author

Commented:
It was the router
JohnBusiness Consultant (Owner)
Most Valuable Expert 2012
Expert of the Year 2018

Commented:
@APD_Toronto  - Thank you for the update and I was happy to help.
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