Icmp Echo Request

The Echo Request is an ICMP message which sends a packet of data to the host and expects that data to be sent in return in a Echo Reply. The host must respond to all Echo Requests with an Echo Reply containing the exact data received in the request message. Message Format:
       
00 01 02 03 04 05 06 07 08 09 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31
Type = 8 Code = 0 Header Checksum

Identifier

Sequence Number

   

Data :::

  • Type must be set to 8.
  • Code must be set to 0.
  • The Identifier and Sequence Number can be used by the client to match the reply with the request that caused the reply.
  • The data received by the Echo Request must be entirely included in the Echo Reply.
See also: * ping

 

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