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3Com Switch 7750 Series
Command Reference Guide – System Maintenance & Debugging
Chapter 2 Network Connectivity Test
Commands
2-2
-r: Specifies to record the routes. By default, the system does not record any route.
-s packetize: Specifies the size (in bytes) of each ECHO-REQUEST packet (excluding
the IP and ICMP headers). The packetize argument ranges from 20 to 32,000 and
defaults to 56 bytes.
-t timeout: Sets the timeout time (in ms) waiting for an ECHO-RESPONSE packet after
an ECHO-REQUEST packet is sent. The timeout argument ranges defaults to 2,000
ms.
-tos tos: Sets the ToS value of the echo request packets in the range of 0 to 255. By
default, this value is 0.
-v: Specifies to display other ICMP packets received (that is, non-ECHO-RESPONSE
packets). By default, except for the ECHO-RESPONSE packets, other ICMP packets
are not displayed.
ip: Chooses IP ICMP packet.
host-ip: Domain name or IP address of the destination host, 1 to 30 characters long.
ipx: Chooses IPX packet.
ipx-address: IPX address of the destination host.
clns: Chooses CLNS ECHO packets.
nsap-address: NSAP address of the destination host.
Description
Use the ping command to check the connectivity of IP network or IPX network, and the
reachability of a host.
The process of executing of the ping command in the IP network: First, the source host
sends an ICMP ECHO-REQUEST packet to the destination host. If the connection to
the destination network is normal, the destination host receives this packet and
responds with an ICMP ECHO-REPLY packet.
You can use the ping command to check the network connectivity and the quality of a
network line. This command can output the following information:
z Response status of the destination to each ICMP ECHO-REQUEST packet. If no
response packet is received within the timeout time, including the number of bytes,
packet sequence number, TTL and response time of the response packet. If no
response packet is received within the timeout time, the message "Request time
out" is displayed instead.
z Final statistics, including the numbers of sent packets and received response
packets, the irresponsive packet percentage, and the minimum, average and
maximum values of response time.
You can set a relatively long timeout time waiting for response packet if the network
transmission is slow.
Related command: tracert.