Limited Network

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?
APD TorontoSoftware DeveloperAsked:
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JohnBusiness Consultant (Owner)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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MattCommented:
Check what IP does the client receive? Can you ping default gateway (in your case IP of the VLAN - internal IP of the router interface)?

DNS settings?

Try this:

ping 8.8.8.8

nslookup www.cisco.com 8.8.8.8
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Fred MarshallPrincipalCommented:
Start with one computer.
Assure that its network interface is set to get an IP address automatically (i.e. via DHCP).
Plug it into a router LAN port.
It should get an IP address.  Check using "ipconfig".  The address should *NOT* start with "169".
If it does get a good address, then the router DHCP function is turned on and working.
If it doesn't, then check that the router DHCP function is ENABLED.
Try again until you get this to work.
If all else fails, try a different computer - but I would not rush to this step.

Now do the same thing but add in the switch.
Everything should still work.
If it does, then the switch (and the cables) are OK.
If not, then the switch or the added cable is suspect.

Do the same for each computer one at a time.
If any of the computers THEN don't work on the switch, the switch *ports* and the added cables are suspect.
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APD TorontoSoftware DeveloperAuthor 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 .
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JohnBusiness Consultant (Owner)Commented:
It could be the router or the switch. Try resetting both by turning off and turning back on after waiting 30 seconds.
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APD TorontoSoftware DeveloperAuthor Commented:
I have reserved specific IPs for each computer on the router.
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JohnBusiness Consultant (Owner)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.
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Fred MarshallPrincipalCommented:
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.
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APD TorontoSoftware DeveloperAuthor Commented:
With A PC directly connected to the router, I ger

PING: transmit failed. General failure.
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JohnBusiness Consultant (Owner)Commented:
Either replace the router or try a hard reset back to factory settings.
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Fred MarshallPrincipalCommented:
What is the result of ipconfig when it's connected that way?
This sounds more like an issue on the PC.
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JohnBusiness Consultant (Owner)Commented:
I'm not sure why so many problem computers if it is a PC problem. It could be a virus outbreak.
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APD TorontoSoftware DeveloperAuthor Commented:
It was the router
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JohnBusiness Consultant (Owner)Commented:
@APD_Toronto  - Thank you for the update and I was happy to help.
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