3com 3.01.01 Manuale Utente

You can perform the following operations in all views.

The descriptions of testing tools for a network connection are found in the 
following:

■

■

The ping command can be used to check the network connection and to verify 
whether the host can be reached. 

Perform the following operation in user view. 

The output of the ping command includes:

■

The response to each ping message. If no response packet is received when 
time is out,”Request time out” information appears. Otherwise, the data bytes, 
the packet sequence number, TTL, and the round-trip time of the response 
packet will be displayed.

■

The final statistics, which include the: 

■

number of the packets the switch sent out and received

■

packet loss ratio

■

round-trip time in its minimum value, mean value and maximum value

Tracert is used for testing the gateways from the source host to the destination. It 
is used for checking if the network is connected and analyzing where faults occur 
in the network.

The following list provides the tracert execution process: 

1 Tracert sends a packet with TTL value of 1. 

2 The first hop sends back an ICMP error message indicating that the packet cannot 

be sent, for the TTL is timeout. 

3 Re-send the packet with TTL value of 2.

4 The second hop returns the TTL timeout message. 

Table 33   Displaying Diagnostic Information

Display diagnostic information

Table 34   The Ping Command

Support IP ping

ping [ -a ip-address ] [-c count ] [ -d ] [ -i 
{interface-type interface-num | interface-name 
} ][ ip ] [ -n ] [ - p pattern ] [ -q ] [ -r ][ -s 
packetsize ] [ -t timeout ] [ -v ] host