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Ping from Fabric Cloud Router

What is the Ping Tool?​

The Ping tool helps you quickly test if your Fabric Cloud Router (FCR) can reach a specific IP address. It’s a fast and easy way to:

  • Check if a destination is reachable
  • Measure network latency
  • Identify potential connectivity or MTU issues

This tool is especially useful for validating routing, troubleshooting network paths, and monitoring performance.

How to Use the Ping Tool​

  1. Go to the FCR Details page.
  2. Click the Network Tools tab.
  3. Select Ping from the left-hand menu.

Configure Your Ping Test​

  • Connection: Choose the connection you want to use as the source for the Ping test.

    note

    IP-WAN connections are not supported as a source.

  • Source IP Address: Select the IP address (IPv4 or IPv6) configured in the routing protocol for the chosen connection.

  • Destination IP Address: Enter the IP address you want to test. Make sure it matches the IP version (IPv4 or IPv6) of the selected source.

  • Packet Size (Optional):
    The default is 64 bytes. You can enter a value between 0 and 8992 bytes.

    tip

    Larger packet sizes (especially over 1500 bytes) can help test for MTU issues. The Ping tool sets the “Do Not Fragment” (DF) flag to detect the maximum MTU supported along the path.

  1. Click the Ping button to start the test.

Example Ping Result​

Ping Initiated  
From FCR-XYZ-Primary to 192.168.101.1 destination  
June 9, 2025 18:10 UTC

PING 192.168.101.1 (192.168.101.1): 64 data bytes  
64 bytes from 192.168.101.1: icmp_seq=0 ttl=64 time=0.089 ms  
64 bytes from 192.168.101.1: icmp_seq=1 ttl=64 time=0.050 ms  
64 bytes from 192.168.101.1: icmp_seq=2 ttl=64 time=0.130 ms  
64 bytes from 192.168.101.1: icmp_seq=3 ttl=64 time=0.054 ms  
64 bytes from 192.168.101.1: icmp_seq=4 ttl=64 time=0.072 ms

--- 192.168.101.1 ping statistics ---  
5 packets transmitted, 5 packets received, 0.0% packet loss  
round-trip min/avg/max/stddev = 0.050/0.079/0.130/0.029 ms

Understanding Ping Results​

Each test sends 5 ICMP echo requests at 1-second intervals. The results include:

  • ICMP Sequence Number
  • TTL (Time to Live)
  • Response Time (ms)

Summary Statistics:

  • Packets Sent / Received
  • Packet Loss (%)
  • Round-Trip Times (Min / Avg / Max / Std Dev)

You can also:

  • Copy Results using the Actions menu
  • View Ping History (last 50 attempts, each with a unique ID)

What If the Ping Fails?​

ResultWhat It Means
No route to hostThe FCR doesn’t have a valid route to the destination. Check routing settings.
100% packet lossAll attempts failed. The destination might be unreachable or blocked.
Request timed outNo response received. Could be due to latency, drops, or firewall rules.
TTL expiredPacket exceeded hop limit. May indicate a routing loop or unreachable path.
tip

If you're using a large packet size and see failures, try reducing the size to check for MTU issues.

When to Use the Ping Tool​

Diagnose Network Issues

  • Check if a destination IP is reachable from a specific FCR connection
  • Identify MTU-related issues using large packet sizes with the DF flag

Validate Routing and Connectivity

  • Confirm that routing protocols are correctly advertising and receiving routes
  • Ensure the correct source IP is being used for outbound traffic

Monitor Network Health

  • Measure latency and packet loss to detect performance issues
  • Use Ping History to track intermittent connectivity problems