Pinging issue

I have 5 computers at my disposal and multiple switches.
I take 2 computers and connect to 1 switch.  Nothing else.  No Internet, etc.

2 computers cannot ping one another.

Same subnet of 255.255.255.0 and IP's of 192.168.0.1 and 192.168.0.2.  I also introduced two other computers as 192.168.0.3 and 192.168.0.4.

No computer can ping the other.

W7 Pro.  Why am I doing this?  All of a sudden the media center fell off of the network.

I've tried this scenario with 2 other known working switches.
Sheldon LivingstonConsultantAsked:
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frankhelkCommented:
Have you tried to set the switch back to factory defaults ?
If the switches are segmented, you surely couldn't ping.
Another test that could rule out the switch: Have you tried to link two of the machines with a crossover cable ?
extremely simple: Does the switch have an uplink port ? Don't use that one ... it's a crossed version of the port beneath, and sticking anything into the crossed port won't work. If the uplink is used, the port nearby is useless and would interfere with the crossed one.
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mitch harperDir. of I.T.Commented:
First make sure each system can ping 127.0.0.1, simple internal network test.  Since this is a closed network and we are only trying to verify connectivity, disable the firewall on the systems completely.  The Windows firewall will not allow a system to respond to the ping.  Try pinging now.  The next step has to do with the switch.  Simple workgroup switches should 'just work', if it is a higher end unit it might have VLANs configured for the ports (this is usually for switches with 24 or more ports).  If the ports are not on the same VLAN you will not get any traffic between them.  If you want, get a crossover cable, or make one, and connect two systems with it.  With the firewall disabled ping should work.
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JohnBusiness Consultant (Owner)Commented:
connect to 1 switch.  Nothing else  <-- So no DHCP server?  You must have static IP addresses. Did you set up a Gateway address?
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Sheldon LivingstonConsultantAuthor Commented:
I set up no gateway.  Then I tried setting the gateway of each to each other.  Still cannot ping.

I have rotated out multiple computers, switches and cables.

The goal is just to get to computers to ping each other that are only connected to a switch.
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JohnBusiness Consultant (Owner)Commented:
Find yourself a small, inexpensive router, allow it to be DHCP server, dispense with the switch and hook it up this way. That should work.
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mitch harperDir. of I.T.Commented:
Gateway isn't needed unless you are trying to get out of the current network.  You stated IP address that each system is assigned with the same subnet mask so that means they are all static assigned.  Your issue sounds like a firewall is blocking traffic.  Windows or whatever antivirus/malware software you have installed could block you.
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CompProbSolvCommented:
Just seconding mitch's comments: your IP addresses and netmasks are correct and don't require a gateway address for your ping test.  If you have a basic switch (that is known to be working correctly) then there aren't any settings there to affect you.  It is almost certainly some sort of firewall issue.

Try booting both computer in Safe Mode with Networking and repeat the Ping test.  I'm betting that it will work.

Have you confirmed that both computers are turning their respective LED on at the switch?  Similarly, if the computer's NIC has LEDs (most do), is the Link LED on?
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UnHeardOfCommented:
is the windows firewall or firewall app turned on?

does the switch use vlans? make sure they are all on the same vlan.
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Sheldon LivingstonConsultantAuthor Commented:
I am going to try CompProbSolv's thought of trying Safe Mode...
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Kamran ArshadIT AssociateCommented:
Hi,

Turn OFF your windows firewall and any other Anti-virus for time being. If not then you have faulty switch or faulty NIC/ drivers missing
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Sheldon LivingstonConsultantAuthor Commented:
Safe mode with networking allowed the computers to ping each other...
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CompProbSolvCommented:
This points to a firewall or similar issue.  Look at them specifically (preferred method) or disable everything from startup (all Startup items, all non-Microsoft services) with Msconfig and reboot.  If pinging works, start putting things back into startup and see which one is the culprit.
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Sheldon LivingstonConsultantAuthor Commented:
At the end of the day I just want to test the connectivity of the switch.  I've got all 9 computers pinging each other which tells me that the connectivity issue that I am having (not mentioned in this question) is not with my switch... it is probably with my fiber connection.
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Sheldon LivingstonConsultantAuthor Commented:
Not sure how to award points... CompProbSolv's suggestion on April 22 did what I wanted.
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frankhelkCommented:
See this help page for details on accepting answers and awarding points.
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Sheldon LivingstonConsultantAuthor Commented:
The answer of using Safe Mode ultimately lead to me resolving both the listed immediate issue as well as my overall issue.
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