3com 4500 PWR 26-PORT User Manual

C

HAPTER

 12: U

SING

 S

YSTEM

 M

ANAGEMENT

 C

OMMANDS

: Configure not to display any other detailed information except statistics.

 Record route.

 Specify the length of ECHO-REQUEST (excluding IP and ICMP 

packet header) in bytes.

 Maximum waiting time after sending the ECHO-REQUEST (measured 

in ms).

 Specify TOS value for echo requests to be sent, range from 0 to 255.

: Show other received ICMP packets (non ECHO-RESPONSE).

 Destination host domain name or IP address.

Use the 

 command to check the IP network connection and the reachability 

of the host.

By default, when the parameters are not specified:

■

the ECHO-REQUEST message will be sent for 5 times,

■

socket is not in DEBUGGING mode,

■

the TTL value for echo requests is 255,.

■

host will be treated as IP address first. If it is not an IP address, perform domain 
name resolution,

■

the default padding operation starts from 0x01 and ends on 0x09 
(progressively), then performs again,

■

show all the information including statistics,

■

routes are not recorded,

■

send ECHO-REQUEST according to route selection,

■

default length of ECHO-REQUEST is 56 bytes.,

■

default timeout of ECHO-RESPONSE is 2000ms,

■

do not display other ICMP packets (non ECHO-RESPONSE),

■

the TOS value of echo requests is 0.

The 

 command sends ICMP ECHO-REQUEST message to the destination. If 

the network to the destination works well, then the destination host will send 
ICMP ECHO-REPLY to the source host after receiving ICMP ECHO-REQUEST.

Perform the 

 command to troubleshoot the network connection and line 

quality. The output information includes:

■

Responses to each of the ECHO-REQUEST messages. If the response message is 
not received until timeout, output "Request time out". Or display response 
message bytes, packet sequence number, TTL and response time.