For the record, RFC 2804 doesn't say "we won't do wiretap, wiretap isn't allowed on the net". It says "we will not modify unrelated protocols in order to support wiretap" and gives a set of reasons. That in no sense precludes having a properly designed feature for intercepting IP datagrams, perhaps with clues contributed from other protocols as to what might be relevant to a set of filters.
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For the record, RFC 2804 doesn't say "we won't do wiretap, wiretap isn't allowed on the net". It says "we will not modify unrelated protocols in order to support wiretap" and gives a set of reasons. That in no sense precludes having a properly designed feature for intercepting IP datagrams, perhaps with clues contributed from other protocols as to what might be relevant to a set of filters.