Nortel 703t, Техническое обслуживание и диагностика

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January 2007 Using Windows online diagnostic tools
703t Server Maintenance and Diagnostics 55
To run the ping command from Windows
1 Click Start
➝
Programs
➝
Accessories
➝
Command Prompt.
Result: The Command Prompt window appears.
2 At the Command prompt, 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 window 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 one before forwarding it, so the TTL is effectively a hop
count.
„
When the TTL on a packet reaches zero, 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 one, and incrementing the TTL by one on 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.