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TCP/IP Guide by Charles M. Kozierok

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ICMPv4 Source Quench Messages

When a source device sends out a datagram, it will travel across the internetwork and eventually arrive at its intended destination (at least, that's what we hope will happen). At that point, it is up to the destination device to process the datagram by examining it and determining which higher-layer software process to hand the datagram.

If a destination device is receiving datagrams at a relatively slow rate, it may be able to process each datagram on the fly as it is received. However, datagram receipt in a typical internetwork can tend to be uneven or bursty, with alternating higher and lower rates of traffic. To allow for times when datagrams are arriving faster than they can be processed, each device has a

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