452 CHAPTER 12: USING SYSTEM MANAGEMENT COMMANDS
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Parameter
-a
source-IP
: Configure the source IP address used by tracert command.
-f: Configure to verify the -f switch,
first-TTL
specifies an initial TTL, ranging
from 0 to the maximum TTL.
-m: Configure to verify the -m switch,
max-TTL
specifies a maximum TTL larger
than the initial TTL.
-p: Configure to verify the -p switch,
port
is an integer host port number.
Generally, user need not modify this option.
-q: Configure to verify the -q switch,
nqueries
is an integer specifying the
number of query packets sent, larger than 0.
-w: Configure to verify the -w switch,
timeout
is an integer specifying IP packet
timeout in seconds, larger than 0.
string
: IP address of the destination host or the hostname of the remote system.
Description
Use the tracert command to check the reachability of network connection and
troubleshoot the network. User can test gateways passed by the packets
transmitted from the host to the destination.
By default, when the parameters are not specified,
first-TTL
is 1,
max-TTL
is 30,
port
is 33434,
nqueries
is 3 and
timeout
is 5s.
The tracert command sends a packet with TTL 1, and the first hop will send an
ICMP error message back to indicate this packet cannot be transmitted (because
of TTL timeout). Then this packet will be sent again with TTL 2, and the second
hop will indicate a TTL timeout error. Perform this operation repeatedly till
reaching the destination. These processes are operated to record the source
address of each ICMP TTL timeout so as to provide a path to the destination for an
IP packet.
After the ping command finds some error on the network, perform tracert to
locate the error.
The output of the tracert command includes IP address of all the gateways to
the destination. If a certain gateway times out, output "***".
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