In message <4F3C76D5.9040603@necom830.hpcl.titech.ac.jp>, Masataka Ohta writes:
Mark Andrews wrote:
This doesn't prove that IPv6 is not operational. All it proves is people can misconfigure things.
How do operators configure their equipments to treat ICMP packet too big generated against multicast and unicast?
Well you need to go out of your way to get a ICMP PTB for IPv6 multicast as the default is to fragment multicast packets at the source at network minimum mtu (RFC3542 - May 2003). That's not to say it won't happen. As for generation of PTB you rate limit them the way you do for IPv4.
Note that, even if they do not enable inter-subnet multicast in their domains, the ICMP packets may still transit over or implode within their domains.
Note also that some network processors can't efficiently distinguish ICMP packets generated against multicast and unicast.
And why do you need to distingish them? You look at the inner packet not the ICMP source if you want to rate limit return traffic.
Masataka Ohta
-- Mark Andrews, ISC 1 Seymour St., Dundas Valley, NSW 2117, Australia PHONE: +61 2 9871 4742 INTERNET: marka@isc.org