3com 4210 PWR 9-Port 3CR17341-91-ME User Manual

You can use the ping command to check the network connectivity and the 
reachability of a host.

This command can output the following results:

■

Response status for each ping packet. If no response packet is received within 
the timeout time, the message "Request time out" is displayed. Otherwise, the 
number of data bytes, packet serial number, TTL (time to live) and response 
time of the response packet are displayed.

■

Final statistics, including the numbers of sent packets and received response 
packets, the irresponsive packet percentage, and the minimum, average and 
maximum values of response time.

You can use the tracert command to trace the gateways that a packet passes 
from the source to the destination. This command is mainly used to check the 
network connectivity. It can also be used to help locate the network faults.

The executing procedure of the tracert command is as follows: First, the source 
host sends a data packet with the TTL of 1, and the first hop device returns an 
ICMP error message indicating that it cannot forward this packet because of TTL 
timeout. Then, the source host resends the packet with the TTL of 2, and the 
second hop device also returns an ICMP TTL timeout message. This procedure 
goes on and on until the packet gets to the destination. During the procedure, the 
system records the source address of each ICMP TTL timeout message in order to 
offer the path that the packet passed through to the destination.

Table 359   The ping command

Check the IP network 
connectivity and the 
reachability of a host 

ping [ -a ip-address ] [-c count 
] [ -d ] [ -f ] [ -h ttl ] [ -i 
interface-type 
interface-number ] [ ip ] [ -n ] [ 
- p pattern ] [ -q ] [ -s 
packetsize ] [ -t timeout ] [ 
-tos tos ] [ -v ] host 

You can execute this 
command in any view.