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 System Basics and Services Command Reference.)
To use the ping host tool:
The Remote Host field is the only required field.
The results of the ping operation are displayed in the main pane (see Figure 56). 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 259 summarizes the output fields of the display.
Figure 55: Ping Host Page
Table 258: 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. |
|
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. |
|
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. |
|
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. |
|
Figure 56: Ping Host Results Page
For more information about the J-Web Diagnose task, see Diagnose Tasks.