Nortel Networks Server 1005r Manuel d'utilisateur Page 51

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June 2007 Using Windows online diagnostic tools
1005r Server Maintenance and Diagnostics 51
To run the ping command from Windows
1 Click Start > Programs > Accessories > Command Prompt.
Result: The Command Prompt dialog box appears.
2 Type ping <destination IP address> (for example, ping
200.286.32.0) or ping <computer name>.
3 Press Enter.
Result: The system displays the ping results.
4 Type Exit to exit the Command Prompt dialog box and return to
Windows.
The tracert command
This utility determines the route taken to a destination.
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.
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