Can't ping across a Catalyst 2960

Answered Question
Feb 18th, 2010
User Badges:

Hello.


I have a Catalyst 2960. From default configuration, all I have done is assign a VLAN with an IP address of 192.10.200.1 and a subnet mask of 255.255.255.0. I 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. I am able to send the broadcast UDP packets just fine, but I can't ping from any computer to any other computer. It would be nice to be able to do this for simple troubleshooting.


I will provide more information if that would help.


Please grace me with your abundant wisdom, O' Great Internets.

Correct Answer by Jon Marshall about 7 years 2 months ago

douglas.ctr.williams wrote:


Jon, thank you for the blazing fast response.


The connected computers have the following IP addresses and subnet masks:


192.10.200.11     255.255.255.0

192.10.200.12     255.255.255.0


They are configured as static with no default gateway.


Douglas


Okay then they are in the same subnet. By the way 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.


Couple of other things to check -


1) can you 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


2) can you make sure there is no personal firewall on the computers blocking the incoming ICMP requests


Jon

  • 1
  • 2
  • 3
  • 4
  • 5
Overall Rating: 3.3 (3 ratings)
Loading.
Jon Marshall Thu, 02/18/2010 - 14:11
User Badges:
  • Super Blue, 32500 points or more
  • Hall of Fame,

    Founding Member

  • Cisco Designated VIP,

    2017 LAN, WAN

douglas.ctr.williams wrote:


Hello.


I have a Catalyst 2960. From default configuration, all I have done is assign a VLAN with an IP address of 192.10.200.1 and a subnet mask of 255.255.255.0. I 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. I am able to send the broadcast UDP packets just fine, but I can't ping from any computer to any other computer. It would be nice to be able to do this for simple troubleshooting.


I will provide more information if that would help.


Please grace me with your abundant wisdom, O' Great Internets.


Douglas


Do the devices all have an IP address out of the same subnet and have the same subnet mask configured ?


Jon

douglas.ctr.williams Thu, 02/18/2010 - 14:17
User Badges:

Jon, thank you for the blazing fast response.


The connected computers have the following IP addresses and subnet masks:


192.10.200.11     255.255.255.0

192.10.200.12     255.255.255.0


They are configured as static with no default gateway.

Correct Answer
Jon Marshall Thu, 02/18/2010 - 14:21
User Badges:
  • Super Blue, 32500 points or more
  • Hall of Fame,

    Founding Member

  • Cisco Designated VIP,

    2017 LAN, WAN

douglas.ctr.williams wrote:


Jon, thank you for the blazing fast response.


The connected computers have the following IP addresses and subnet masks:


192.10.200.11     255.255.255.0

192.10.200.12     255.255.255.0


They are configured as static with no default gateway.


Douglas


Okay then they are in the same subnet. By the way 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.


Couple of other things to check -


1) can you 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


2) can you make sure there is no personal firewall on the computers blocking the incoming ICMP requests


Jon

nelson.garcia Thu, 02/18/2010 - 14:19
User Badges:

Douglas, 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.

glen.grant Thu, 02/18/2010 - 16:19
User Badges:
  • Purple, 4500 points or more

  I put my bet on  personal FW's on the clients blocking pings.

douglas.ctr.williams Tue, 02/23/2010 - 11:16
User Badges:

Thank you Jon and Glen.


It was indeed Windows Firewall that was blocking the ICMP requests.


Jon, your blazing fast responses are very much appreciated.

Actions

This Discussion