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ICMP Echo Request - Definition and Overview |
| Related Words: Application, Ask, Beg, Call, Crave, Demand, Desire, Indent, Instance, Motion, Order |
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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:
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| Type = 8 |
Code = 0 |
Header Checksum |
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Identifier |
<p align="center">Sequence Number |
</table>
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Data ::: |
</table>
- 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:
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