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ICMP messages are encapsulated into
datagrams in the same way any other data is delivered using IP. Figure
 displays
the encapsulation of ICMP data within an IP datagram.Since ICMP messages are transmitted in
the same way as any other data, they are subject to the same delivery
failures. This creates a scenario where error reports could generate
more error reports, causing increased congestion on an already ailing
network. For this reason, errors created by ICMP messages do not
generate their own ICMP messages. It is thus possible to have a
datagram delivery error that is never reported back to the sender of
the data.
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