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Using Windows online diagnostic tools
How tracert works
The tracert utility follows several steps to complete its task:
• Tracert sends Internet Control Message Protocol (ICMP) echo packets with varying Time-
To-Live (TTL) values to the destination.
• Each router along the path must decrement the TTL on a packet by at least 1 before
forwarding it, so the TTL is effectively a hop count.
• When the TTL on a packet reaches 0, the router sends back an ICMP Time Exceeded
message to the source system.
• Tracert determines the route by sending the first echo packet with a TTL of 1, and
incrementing the TTL by 1 each subsequent transmission until the target responds or the
maximum TTL is reached.
• Tracert then examines the ICMP Time Exceeded messages sent back by intermediate
routers.
Tracert syntax
The tracert command uses the following syntax:
tracert [-d] [-h maximum_hops] [-j host_list] [-w timeout]
[target_name]
Tracert parameters
The following table shows the tracert parameters.
Table 7: Tracert parameters
-d
-h maximum_hops
-j host-list
-w timeout
34
Avaya CallPilot® 1005r Server Maintenance and Diagnostics
Parameter
Description
Specifies not to resolve addresses to host names.
Specifies the maximum number of hops to search for
the target.
Specifies a loose source route along the host list.
Waits the number of milliseconds specified by the
timeout for each reply.
December 2010
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