ICMP Extension Structure
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... Unreachable, Time Exceeded, and Parameter Problem messages.
An ICMP Extension Structure MAY be appended to ICMPv6 Destination
...
... original datagram" field.
When the ICMP Extension Structure is appended to an ICMP message
and that ICMP message ...
... original datagram" field MUST contain at least 128 octets.
When the ICMP Extension Structure is appended to an ICMPv4 message
and that ICMPv4 ...
... 32-bit boundary.
When the ICMP Extension Structure is appended to an ICMPv6 message
and that ICMPv6 ...
... - Time Exceeded (type = 3)
The length attribute MUST be specified when the ICMP Extension
Structure is appended to the above mentioned ICMP messages.
...
...
In order to achieve backwards compatibility, when the ICMP Extension
Structure is appended to an ICMP message and that ICMP message
...
...
The ICMP Extension Structure MAY be appended to messages of the
following types:
...
... ICMPv6 Time Exceeded
The ICMP Extension Structure MUST NOT be appended to any of the other
ICMP messages mentioned in Section 4. Extensions were not defined
...
... ICMP extensions
described in this memo. Specifically, these implementations may
append the ICMP Extension Structure to the Time Exceeded and
Destination Unreachable messages. When they do this, they send
...
... The ICMP Extension Structure ...
...
This memo proposes an optional ICMP Extension Structure that can be
appended to the ICMP messages referenced in Section 4.6 of this
...