R3166-R3206-HP High-End Firewalls System Management and Maintenance Command Reference-6PW101

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extend it to 8 bits. For example, if pad is configured as 0x2f, then the packets will be padded with
0x0000002f repeatedly to make the total length of the packet meet the requirements of the device. By
default, the padded value starts from 0x01 up to 0xff, where another round starts again if necessary, like
0x010203…feff01….
-q: Presence of this keyword indicates that only statistics are displayed. Absence of this keyword
indicates that all information is displayed.
-r: Records routing information. If this keyword is not provided, routes are not recorded.
-s packet-size: Specifies length (in bytes) of an ICMP echo request, in the range 20 to 8100. The default
value is 56.
-t timeout: Specifies the timeout value (in milliseconds) of an ICMP echo reply (ECHO-REPLY). If the
source does not receive an ICMP echo reply within the timeout, it considers the ICMP echo reply timed
out. The value ranges from 0 to 65535 and defaults to 2000.
-tos tos: Specifies type of service (ToS) of an echo request, in the range 0 to 255. The default value is 0.
-v: Displays non ICMP echo reply received. If this keyword is not provided, the system does not display
non ICMP echo reply.
-vpn-instance vpn-instance-name: Specifies the name of an VPN instance, which is a case sensitive string
of 1 to 31 characters. If a VPN instance is configured on both source and destination, when you execute
the ping command, this keyword must be provided; otherwise, the ping operation fails. If you want to
check whether there is an available route between two nodes in a VPN, you need to use this keyword to
specify the VPN instance to which the two nodes belong.
host: IP address or host name (a string of 1 to 255 characters) of the destination.
Description
Use the ping command to verify whether the destination in an IP network is reachable, and to display the
related statistics.
After you execute the ping command, the source will send an ICMP echo request to the destination:
• If the destination name is unrecognizable, the system outputs “Error: Ping: Unknown host
host-name”.
• If the source receives an ICMP echo reply from the destination within the timeout, the system outputs
the related information of the reply.
• If the source does not receive an ICMP echo reply from the destination within the timeout, the system
outputs “Request time out”.
Note that:
• To use the name of the destination host to perform the ping operation, you must configure Domain
Name System (DNS) on the device first; otherwise, the ping operation fails. For more information
about DNS, see Network Management Configuration Guide. In addition, you must use the
command in the form of ping ip ip instead of ping ip if the destination name is a key word, such as
ip.
• Only the directly connected segment address can be pinged if the outbound interface is specified
with the -i argument.
During the execution of the command, you can press Ctrl+C to abort the ping operation.
Examples
# Check whether the device with an IP address of 1.1.2.2 is reachable.
<Sysname> ping 1.1.2.2