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Cisco Meraki

Using the Ping Live Tool

Overview

When troubleshooting a network, ping can be a useful tool for verifying client/network reachability. All Cisco Meraki devices provide a ping live tool, however the behavior of that tool varies by platform. This article will identify those differences.

Ping Tool Location by Platform

  • MX - Security & SD-WAN > Appliance Status > Tools
  • MS - Switch > Switches > (Select a switch) > Tools
  • MR - Wireless > Access points > (Select an AP) > Tools
  • MG - Cellular Gateway > Cellular Gateways > (Select an MG) > Tools
  • MV - Cameras > Cameras > (Select a Camera) > Network

 

Pinging from Live Tools

To perform a ping from a specific device, navigate to the status page for that device and find Ping under Tools.

pingTool_generalLocation.png

 

Enter a destination value, such as an IP address or DNS hostname, then click Ping to begin the test. The section that appears will include information on the percentage of packets lost, average latency, and provide a graph of the latency to the device while the test is running.

pingTool_dns_and_ip_response1.png

 

If the ping tool shows 100% loss, the outgoing request either wasn't able to reach the destination or the reply wasn't received by the Meraki device.

pingTool_ip_noResponse.png

 


MX Ping Tool

The MX ping tool will accept the following values

  • IP address
  • DNS hostname
  • Client MAC address

Note: Entering a Client MAC address does not trigger the MX to perform an ARPing. When a MAC address is entered, the MX will attempt to map the client MAC address to a known IP address using its ARP table, then will initiate an IP ping.

Behavior - Firmware MX 15.11 or Lower

For MXs running firmware MX15.11 or below, the source IP that MX uses while pinging a destination is the MX IP of highest VLAN ID. If the destination is across a VPN, the MX uses the MX IP of highest VLAN ID participating in VPN.

 

pingTool_mx15.11-_ping.png

Behavior - Firmware MX 15.12 or Higher

For MXs running firmware MX 15.12+, additional ping options have been added to the live tool. The ping tool now has a drop down to select the source IP address for pinging destinations from the MX.

pingTool_mx15.12+_ping.png

Source IP Address Options:

Default. The MX uses the route table to dynamically choose the ping source IP address closest to the destination IP entered.

  • LAN example: If you input a destination IP that is in VLAN A, the MX will source the ping from its VLAN A interface IP
  • Site-to-site VPN example: If you input a destination IP that resides across a site-to-site VPN, the MX will source the ping from the highest MX VLAN interface IP that is participating in the VPN
  • Internet example: If you input a destination IP that resides on the WAN/internet, the MX will source the ping from the configured MX primary uplink (as configured on SD-WAN and traffic shaping)

Internet #. The source IP address will be the WAN IP address selected. The ping will continue to follow the same routing as clients connected on the LAN of the MX.

VLAN #. The source IP address will be the VLAN IP address selected. The ping will continue to follow the same routing as clients connected on the LAN of the MX.

Note:

If a VLAN source interface is selected for the ping tool, the ping traffic will not be able to traverse through the MX NAT.

  • Example: If a VLAN source interface is selected, pings to destination IPs on the WAN, such as 8.8.8.8 or google.com, will always show 100% loss

If VLANs are disabled on the MX while in-routed, the LAN source interface will be named "VLAN 0"

Behavior - MX in Passthrough Mode

If the MX is operating in passthrough mode (e.g. one-armed VPN concentrator), the source IP will generally be the MX WAN interface IP.


MS Ping Tool

The MS switches ping tool will accept the following values

  • IP address
  • DNS hostname

 

MS switches will source pings from either the management interface or the configured layer 3 interface.

  • If the MS switch/stack is only configured for layer 2 switching, pings will be sourced from the MS management interface
  • If the MS switch/stack has a layer 3 routing configuration, pings will be sourced from the layer 3 interface specified in the drop-down menu

 


MR, MV Ping Tool

The MR and MV ping tool will accept the following values:

  • IP address
  • DNS hostname

On MR access points and MV cameras, the ping tool will source the ping from the device's management interface.

Note: For MR access points, If you ping a client that is wirelessly connected to the same AP you are sourcing the pings from, the pings will go directly between the AP and the wireless client. This holds true regardless of the VLAN configured for the SSID.