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Using the J-Web Ping Host Tool

You can ping a host to verify that the host can be reached over the network. The output is useful for diagnosing host and network connectivity problems. The J Series device sends a series of ICMP echo (ping) requests to a specified host and receives ICMP echo responses.

Alternatively, you can use the CLI ping command. (See the Junos OS System Basics and Services Command Reference.)

To use the ping host tool:

  1. Select Troubleshoot>Ping Host from the task bar.
  2. Next to Advanced options, click the expand icon.
  3. Enter information into the Ping Host page, as described in Table 271.

    The Remote Host field is the only required field.

  4. Click Start.

    The results of the ping operation are displayed in the main pane. 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

    Table 272 summarizes the output fields of the display.

  5. To stop the ping operation before it is complete, click OK.

Table 271: J-Web Ping Host Field Summary

Field

Function

Your Action

Remote Host

Identifies the host to ping.

Type the hostname or IP address of the host to ping.

Advanced Options

Don't Resolve Addresses

Determines whether to display hostnames of the hops along the path.

  • To suppress the display of the hop hostnames, select the check box.
  • To display the hop hostnames, clear the check box.

Interface

Specifies the interface on which the ping requests are sent.

From the list, select the interface on which ping requests are sent. If you select any, the ping requests are sent on all interfaces.

Count

Specifies the number of ping requests to send.

From the list, select the number of ping requests to send.

Don't Fragment

Specifies the Don't Fragment (DF) bit in the IP header of the ping request packet.

  • To set the DF bit, select the check box.
  • To clear the DF bit, clear the check box.

Record Route

Sets the record route option in the IP header of the ping request packet. The path of the ping request packet is recorded within the packet and displayed in the main pane.

  • To record and display the path of the packet, select the check box.
  • To suppress the recording and display of the path of the packet, clear the check box.

Type-of-Service

Specifies the type-of-service (TOS) value in the IP header of the ping request packet.

From the list, select the decimal value of the TOS field.

Routing Instance

Name of the routing instance for the ping attempt.

From the list, select the routing instance name.

Interval

Specifies the interval, in seconds, between the transmission of each ping request.

From the list, select the interval.

Packet Size

Specifies the size of the ping request packet.

Type the size, in bytes, of the packet. The size can be from 0 through 65468. The device adds 8 bytes of ICMP header to the size.

Source Address

Specifies the source address of the ping request packet.

Type the source IP address.

Time-to-Live

Specifies the time-to-live (TTL) hop count for the ping request packet.

From the list, select the TTL.

Bypass Routing

Determines whether ping requests are routed by means of the routing table.

If the routing table is not used, ping requests are sent only to hosts on the interface specified in the Interface box. If the host is not on that interface, ping responses are not sent.

  • To bypass the routing table and send the ping requests to hosts on the specified interface only, select the check box.
  • To route the ping requests using the routing table, clear the check box.

For more information about the J-Web Diagnose task, see Diagnose Tasks.


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