Want to protect your cyber security and still get fast solutions? Ask a secure question today.Go Premium

x
?
Solved

Computers can't ping eachother

Posted on 2010-09-20
6
Medium Priority
?
791 Views
Last Modified: 2012-05-10
I have a very strange problem.
Computers can't ping each other on the same network.

In the labs at the College we use LanSchool and the teacher was unable to check students computers. When I check I did a simple ping from the teacher computer to a student computer and was unable to ping it.

I tested several other computers on the same lab and no computer can ping the other.

They are all using DHCP and connected to an AP (Cisco Aironet 1250). They all use a wireless card.

I check the firewall setting on our server and ICMP is allowing ech request and nothing is blocking that so I really don't understand what should be the next step to check what is going on.

I even tried Wireshark and I can't seem to ping to any other external IP exept the servers.

Internet connection is working ok tough.

Any ideas?
0
Comment
Question by:SamKira
6 Comments
 
LVL 1

Expert Comment

by:teksamurai
ID: 33719730
Check if you have the Windows Firewall turned on for each of the PCs. They are on by default.

0
 
LVL 4

Expert Comment

by:1oo4
ID: 33719733
Try pinging both from the router. Could be a locally installed firewall.
0
 
LVL 72

Expert Comment

by:Qlemo
ID: 33720672
Definitely a local firewall on each PC. The servers are not involved in a ICMP between PCs. Remember, Windows Firewall default settings are to block all incoming connections, and allow all outbound traffic.
0
Industry Leaders: We Want Your Opinion!

We value your feedback.

Take our survey and automatically be enter to win anyone of the following:
Yeti Cooler, Amazon eGift Card, and Movie eGift Card!

 
LVL 17

Expert Comment

by:pergr
ID: 33723539
It is possible that the Cisco Aironet 1250 is set to not allow traffic between wireless clients.
0
 
LVL 1

Author Comment

by:SamKira
ID: 33724339
First reaction was to disable firewall on local machines. Microsoft firewall is off and there is no other firewall installed.

It is possible that the Cisco Aironet 1250 is set to not allow traffic between wireless clients.?
I don't think so, if it is would have to be the default since I've restarted the AP several times.
0
 
LVL 1

Accepted Solution

by:
teksamurai earned 2000 total points
ID: 33734269
Your server or router may have a configuration to segment each PC as a separate user. This would typically be put in to keep one student from accessing another student's PC in the lab.

Check the IP, subnet mask, and gateway on at least 2 computers. The subnet mask should include all PC's in the lab.

You may also want to check with your sys admin. There maybe a third party package that is keeping them from communicating with each other. Some of these will hide their agent's installation to prevent student uninstall.
0

Featured Post

Get your problem seen by more experts

Be seen. Boost your question’s priority for more expert views and faster solutions

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

WARNING:   If you follow the instructions here, you will wipe out your VTP and VLAN configurations.  Make sure you have backed up your switch!!! I recently had some issues with a few low-end Cisco routers (RV325) and I opened a case with Cisco TA…
This program is used to assist in finding and resolving common problems with wireless connections.
After creating this article (http://www.experts-exchange.com/articles/23699/Setup-Mikrotik-routers-with-OSPF.html), I decided to make a video (no audio) to show you how to configure the routers and run some trace routes and pings between the 7 sites…
After creating this article (http://www.experts-exchange.com/articles/23699/Setup-Mikrotik-routers-with-OSPF.html), I decided to make a video (no audio) to show you how to configure the routers and run some trace routes and pings between the 7 sites…

581 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question