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Friday, February 26, 2010

Can't ping across a Catalyst 2960


We have a Catalyst 2960. From default configuration, all we have done is assign a VLAN with an IP address of 192.10.200.1 and a subnet mask of 255.255.255.0. We am not setting a default gateway because there is no gateway - that field just stays at the default value.

This switch will not be connected to any other networks; it will only have a few computers on it that will be sending broadcast UDP packets to each other. We are able to send the broadcast UDP packets just fine, but we can't ping from any computer to any other computer. It would be nice to be able to do this for simple troubleshooting.

Diagnostic Steps
  1. Make sure that they are in the same subnet. Because the 2960 is a L2 switch it doesn't matter what you configure the vlan interface on the switch as in terms of vlan or IP address.
  2. Confirm that the computers in the same vlan ie. the ports they are connected into are in the same vlan. Should be as UDP broadcasts are working
  3. Make sure there is no personal firewall on the computers blocking the incoming ICMP requests
A 2960 is just a layer 2 switch. As long as the devices you are trying to ping belong to the same subnet, they should be able to ping each other. If they're on different VLANs or subnets, you'll need a separate router.

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