### Section 4

Even if the text is better in -02, the operational considerations / backward 
compatibility are still vague.

As I said in my review, on this point I think that Section 7 of RFC 4884 
applies: In particular the text:

   Having received an ICMP message
   with extensions, application software MAY process selected objects
   while ignoring others.  The presence of an unrecognized object does
   not imply that an ICMP message is malformed.

I interpret it as "unrecognized objects" are ignored by implementations that 
respect 4884.

My 2cts

Ciao

L.
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