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Troubleshooting Ping Host
Description: 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.
To use the ping host tool:
- Select Troubleshoot>Ping Host in the J-Web
user interface if you are using SRX5400, SRX5600, or SRX5800 platform.
Select Administration>Ping Host in the J-Web user interface.
- Click the expand icon next to Advanced options.
- Enter the information specified in Table 277 to troubleshoot the issue.
The Remote Host field is the only required field.
- 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
- Click OK to stop the ping operation before it is complete.
Table 277: Ping Host Troubleshooting Options
Identifies the host to ping.
Type the hostname or IP address of the host to ping.
Don't Resolve Addresses
Determines whether or not to display hostnames of the hops along the path.
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.
Specifies the number of ping requests to send.
From the list, select the number of ping requests to send.
Specifies the don't fragment (DF) bit in the IP header of the ping request packet.
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.
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.
Specifies the name of the routing instance for the ping attempt.
From the list, select the routing instance name.
Specifies the interval, in seconds, between the transmission of each ping request.
From the list, select the interval.
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 to the size of the ICMP header.
Specifies the source address of the ping request packet.
Type the source IP address.
Specifies the time-to-live (TTL) hop count for the ping request packet.
From the list, select the TTL.
Determines whether or not 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.
|Ping Host Results and Output Summary|
bytes bytes from ip-address
number—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.