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Troubleshoot Ping Host
About Ping Host Page
You are here: Device Administration > Tools > Ping Host.
The ping diagnostic tool sends a series of ICMP "echo request" packets to the specified remote host.
The receipt of such packets will usually result in the remote host replying with an ICMP "echo response." Note that some hosts are configured not to respond to ICMP "echo requests," so a lack of responses does not necessarily represent a connectivity problem. Also, some firewalls block the ICMP packet types that ping uses, so you may find that you are not able to ping outside your local network.
You can ping a host to verify that the host can be reached over the network or not.
To use the ping host tool:
- Enter the information specified in Table 1 to troubleshoot
The Remote Host field is the only required field.
- Click the expand icon next to Advanced options.
- Click Start.
The results of the ping operation are displayed in Table 2. If no options are specified, each ping response is in the following format:
bytes bytes from ip-address: icmp_seq=number ttl=number time=time
- Click OK to stop the ping operation before it is complete.
Table 1: Ping Host Troubleshooting Options
Type the hostname or IP address of the host to ping.
Don't Resolve Addresses
From the list, select the interface on which ping requests are sent. If you select any, the ping requests are sent on all interfaces.
From the list, select the number of ping requests to send.
From the list, select the decimal value of the ToS in the IP header of the ping request packet.
From the list, select the routing instance name for the ping attempt.
From the list, select the interval in seconds, between the transmission of each ping request.
Type the size, in bytes, of the packet. The size can be from 0 through 65468. The device adds 8 bytes to the size of the ICMP header.
Type the source IP address of the ping request packet.
From the list, select the TTL hop count for the ping request packet.
Table 2: Ping Host Results and Output Summary
bytes bytes from ip-address
time—Sequence Number field of the ping response packet. You can use this value to match the ping response to the corresponding ping request.
number—TTL hop-count value of the ping response packet.
time—Total time between the sending of the ping request packet and the receiving of the ping response packet, in milliseconds. This value is also called round-trip time.
number packets transmitted
number—Number of ping requests (probes) sent to host.
number packets received
number—Number of ping responses received from host.
percentage packet loss
percentage—Number of ping responses divided by the number of ping requests, specified as a percentage.
round-trip min/avg/max/stddev = min-time/avg-time/max-time/std-dev ms
Output = Packet loss of 100 percent
If the device does not receive ping responses from the destination host (the output shows a packet loss of 100 percent), one of the following explanations might apply:
For more information about ICMP, see RFC 792, Internet Control Message Protocol.