<div>
Are the network cables and connections good?<br />
<br />
On one problem computer reset TCP/IP, restart and test<br />
<br />
Open cmd.exe with Run as Administrator<br />
Then &nbsp;netsh int ip reset c:\resetlog.txt<br />
Restart the computer<br />
Remake wireless profiles as needed<br />
<br />
Also, ipconfig /flushdns followed by net stop dnscache followed by net start dnscache
</div>


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

<div>
I forgot to mention all computers that lost network, lost it at the same time. Could it be the router .<br />
<br />
Maybe 5 of 12 computers lost access .
</div>


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 .

<div>
It could be the router or the switch. Try resetting both by turning off and turning back on after waiting 30 seconds.
</div>


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

<div>
I have reserved specific IPs for each computer on the router.
</div>


I have reserved specific IPs for each computer on the router.

<div>
You would be better off with DHCP, I think. I stopped using workstation static IP a couple of decades ago. <br />
<br />
The router could have gotten mixed up and therein your issue. Make one computer DHCP and see.
</div>


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.

<div>
As I suggested earlier, use DHCP and work through the computers one at a time.<br />
I did not anticipate that you had set up reserved IP addresses on the router DHCP.<br />
While that's fine, I would strongly suggest you forego that nicety while troubleshooting this issue.
</div>


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.

<div>
With A PC directly connected to the router, I ger<br />
<br />
PING: transmit failed. General failure.
</div>


With A PC directly connected to the router, I ger

PING: transmit failed. General failure.

<div>
What is the result of ipconfig when it's connected that way?<br />
This sounds more like an issue on the PC.
</div>


What is the result of ipconfig when it's connected that way?
This sounds more like an issue on the PC.

<div>
I'm not sure why so many problem computers if it is a PC problem. It could be a virus outbreak.
</div>


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

<div>
@APD_Toronto &nbsp;- Thank you for the update and I was happy to help.
</div>


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

<div>
<div class="content wysiwyg-content">
Hi Experts,<br />
<br />
I have a simple network topology: router which goes to a switch with multiple computers.<br />
<br />
Some computers have network access, some dont. Even the computer that is directly connected to the router does not have network access.<br />
<br />
What could it be?
</div>
</div>


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?

Limited Network

A router is a networking device that forwards data packets between computer networks. Routers perform the "traffic directing" functions on the Internet. The most familiar type of routers are home and small office cable or DSL routers that simply pass data, such as web pages, email, IM, and videos between computers and the Internet. More sophisticated routers, such as enterprise routers, connect large business or ISP networks up to the powerful core routers that forward data at high speed along the optical fiber lines of the Internet backbone. Though routers are typically dedicated hardware devices, use of software-based routers has grown increasingly common.

Routers

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.

Windows Networking

Networking hardware includes the physical devices facilitating the use of a computer network. Typically, networking hardware includes gateways, routers, network bridges, modems, wireless access points, networking cables, line drivers, switches, hubs, and repeaters. But it also includes hybrid network devices such as multilayer switches, protocol converters, bridge routers, proxy servers, firewalls, network address translators, multiplexers, network interface controllers, wireless network interface controllers, ISDN terminal adapters and other related hardware.