Florian Weimer wrote:
The joke is in RFC 4294 (sections 4.5.4 and 8 in particular).
My favorite joke of IPv6 is in RFC4443: (e) An ICMPv6 error message MUST NOT be originated as a result of receiving the following: (e.3) A packet destined to an IPv6 multicast address. (There are two exceptions to this rule: (1) the Packet Too Big Message (Section 3.2) to allow Path MTU discovery to work for IPv6 multicast, and (2) the Parameter Problem Message, Code 2 You can send a 1500B packet with a forged source address of DDoS target to a multicast group with huge number of receivers using PPPoE at their last hops. As for feedback, I warned IPv6 WG about the problem, twice. Some sane people will completely disable and filter out "Packet Too Big Message"s including those against unicast packets. And there should be other jokes not all of which is recognized by operators. Masataka Ohta