ICMPv4 Parameter Problem Messages
The previous sections in this chapter describe four specific ICMPv4 message types that allow a device to report various error conditions to the original sender of a datagram. However, other error situations may arise that don't correspond to any of these four specific message types. Typically, the problem results when a device attempts to process the header fields of an IP datagram and finds something in it that doesn't make sense.
If a device finds a problem with any of the parameters in an IP datagram header that is serious enough that it cannot complete processing the header, it must discard the datagram. As in other cases where a datagram must be tossed out, this is serious enough to warrant communication of ...
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