3Com NBX 100 Administrator's Manual page 431

To check a connection:
1 Access the DOS command prompt from the DOS shell in Windows.
2 Enter on the command line:
ping
ping <192.168.1.190>
3 Interpret ping results:
a
Request timed out
Ping reached the network but couldn't connect to the host
(No such address; or the device is down.)
Initial request timed-out
(It is normal for a first ping to fail and subsequent pings to
succeed.)
Subsequent requests timed-out
(Indicates some packet loss. Rerun using the "-n 100" option. The
"request timed out" number represents the percentage of lost
packets. These packets could have been lost in either direction.)
b Destination host not reachable
Ping couldn't negotiate a path to the specified address
PC is not plugged into LAN, incorrect gateway address in route,
(
or a firewall blocked the ping.)
c
Approximate round-trip times in milliseconds
Ping time greater than
(Ping times can differ because the network often routes individual
packets along different internal routes depending on congestion.)
4 Use on the command line:
tracert
tracert <192.168.1.190>
5 Interpret trace results:
The command lists every IP gateway it encounters as it tries to
tracert
reach the specified destination. It also includes the number of times (3)
required to reach each intermediate gateway. If a network connection
failure occurred in route, this command indicates where it occurred.
Because the
tracert
across a network, it can be useful for comparing the performance of
alternative internet service providers.
(sample IP address)
(all four times)
but preferably less than 300 ms.
10 ms
(example IP address)
command reveals the chain of logical connections
Checking Connections 431