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Internet Control Message Protocol (ICMP)

Internet Control Message Protocol (ICMP). ICMP. Internet Control Message Protocol IP is the delivery standard at the TCP/IP internet layer ICMP is the standard for supervisory messages IP and ICMP are designed to work together; Even have adjacent RFC (standard) numbers

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Internet Control Message Protocol (ICMP)

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  1. Internet Control Message Protocol (ICMP)

  2. ICMP • Internet Control Message Protocol • IP is the delivery standard at the TCP/IP internet layer • ICMP is the standard for supervisory messages • IP and ICMP are designed to work together; Even have adjacent RFC (standard) numbers • ICMP message is carried in the information field of an IP packet

  3. ICMP • Several ICMP Message Types • Error messages warn of problems • Not error correction, because there is no transmission of lost or damaged packets Error Message

  4. ICMP • Several ICMP Message Types • ICMP query request message asks host if it is active • Queried host sends back a query response message • Also called “Echo” and “Ping” Echo Request Echo Response

  5. ICMP • Several ICMP Message Types • Flow control: Source quench ICMP message asks other side to slow down Source Quench

  6. Source Quench • Weak form of flow control • When host sending packets gets source quench, it slows down • If another source quench message arrives, slows down even more • If source quench messages stop, slowly increases speed

  7. ICMP • ICMP Implements Other Supervisory Messages • We have only given a few important examples

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