Using Ping Host

Use the Ping Host page to verify that the host can be reached over the network. The output is useful for diagnosing host and network connectivity problems. The Services Router sends a series of ICMP echo (ping) requests to a specified host to determine:

• Whether a remote host is active or inactive
• The round-trip delay in communicating with the host
• Packet loss

Entering a hostname or address in the Ping Host page creates a periodic ping task that runs until cancelled or until it times out as specified. When you use the ping host tool, the routing platform first sends an echo request packet to an address, then waits for a reply. The ping is successful if it has the following results:

• The echo request gets to the destination host.
• The destination host is able to get an echo reply back to the source within a predetermined time called the round-trip time.

Alternatively, you can enter the ping command at the J-Web CLI terminal. For more information, see Using the CLI Terminal. For more information about the ping command, see the JUNOS System Basics and Services Command Reference.

Because some hosts are configured not to respond to ICMP echo requests, a lack of responses does not necessarily represent a connectivity problem. Also, some firewalls block the ICMP packet types that ping uses, so you might find that you are not able to ping outside your local network.

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