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ICMP
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Errors detected may be reported via the Internet Control Message
Protocol (ICMP) [3] which is implemented in the internet protocol
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... +--------------------------+----+
| Internet Protocol & ICMP |
+--------------------------+----+
|
...
... +-------------------------------+
| Internet Protocol & ICMP & GGP|
+-------------------------------+
| |
...
... original datagram is
considered to be in error and is discarded. In either case an
ICMP parameter problem message may be sent to the source
host ...
... original datagram is considered to be in error and is discarded.
In either case an ICMP parameter problem message may be sent to
the source host ...
... network field means this network. This is
only used in certain ICMP messages. The extended addressing mode
is undefined. Both of these features are reserved for future use.
...
... case, the user addressed is notified of a pending datagram. If the
user addressed does not exist, an ICMP error message is returned to
the sender, and the data is discarded.
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... ICMP ...
... Internet Control Message Protocol, implemented in the internet
module, the ICMP is used from gateways to hosts and between
hosts ...