July 2002
Beginner
360 pages
11h 19m
English
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Processing Rules
There are several rules that govern processing of ICMP packets. They can be found in RFC 2463 and are summarized as follows:
If a node receives an ICMPv6 error message of unknown type, it must pass it to the upper layer.
If a node receives an ICMPv6 informational message of unknown type, it must be silently discarded.
As in ICMPv4, as much as possible of the packet that caused the ICMP error message will be included in the ICMP message body. The ICMP packet should not exceed the minimum IPv6 MTU.
If the error message has to be passed to the upper-layer protocol, the protocol type is determined by extracting it from the original packet (present in the body of the ICMPv6 error message). In case the protocol type cannot be found in the body of the ICMPv6 message (because there were too many extension headers present in the original packet and the part of the header that contained the upper-layer protocol type was truncated), the ICMPv6 message is silently discarded.
An ICMPv6 message must not be sent in the following cases:
As a result of an ICMPv6 error message.
As a result of an ICMPv6 redirect message.
As a result of a packet sent to an IPv6 multicast address. There are two exceptions to this rule: the Packet Too Big message that is used for Path MTU discovery and the Parameter Problem with the code value 2 for an unrecognized IPv6 option.
As a result of a packet sent as a link-layer multicast (same exceptions as above apply).
As a result of a packet sent as a ...
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