User Manual
U-SYS IAD108 Integrated Access Device
Chapter 7 Maintaining System
7-63
Parameter Meaning
of
parameter
-q
Sets the number of detection packets
-w
Sets time-out time
The procedure of executing
tracert
is: first send a data packet
with TTL as 1. Therefore, an ICMP error message is returned for the
first hop to indicate that the data packet cannot be sent (since TTL is
time out), after that, the data packet is resent, with TTL as 2. Similarly,
TTL timeout is returned for the second hop. The procedure is carried
on constantly until reaching the destination. The purpose of carrying
out these procedures is to record the source address of each ICMP
TTL timeout message, so as to provide the path through which an IP
data packet reaches the destination.
7.8.3 Example for Command Ping
I.
Networking
As shown in the following diagram, IAD108 maintenance port is
connected to the maintenance terminals 1 and 2 through Local Area
Network (LAN). The IP addresses of the three parties respectively
are: 172.21.100.16, 172.21.50.51, and 172.21.50.84.
