Ping; Tracert; Figure 5-1 Principle Of The Ping Operation; Figure 5-2 Format Of Icmp Echo Request And Echo Reply Messages - Huawei Quidway S9300 Configuration Manual - Network Management

5 Ping and Tracert

5.1 Ping

The ping command is used to check network connectivity and host reachability. The word "ping"
is derived from the sonar operation, indicating a pulse of sound.
Figure 5-1
Message Protocol (ICMP) Echo Request message is sent to the destination. The destination then
returns an ICMP Echo Reply message immediately when receiving the ICMP Echo Request
message.

Figure 5-1 Principle of the ping operation

Source
Ping tests IP reachability and status of the link between the source and the destination by checking
whether the destination sends back an ICMP Echo Reply message and measuring the interval
between sending the ICMP Echo Request message and receiving the ICMP Echo Reply message.

Figure 5-2 Format of ICMP Echo Request and Echo Reply messages

0
Figure 5-2
the Data field is a variable. You can specify the length of the Data field in the ping command.

5.2 Tracert

Tracert, also called Trace Route, is used to check the IP addresses and the number of gateways
between the source and the destination. Tracert is helpful in testing network reachability and
locating the fault on the network.
5-2
shows the ping process.After you run the ping command, an Internet Control
ICMP Echo Request message
ICMP Echo Reply message
7
Type Code
Identifier
shows the format of ICMP Echo Request and Echo Reply messages. The length of
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Quidway S9300 Terabit Routing Switch
Configuration Guide - Network Management
Destination
15 23
Checksum
Sequence number
Data
31
Issue 03 (2010-09-20)