On Jul 27, 2011, at 11:12 PM, Michel Py wrote: > > According to this: > http://www.pam2010.ethz.ch/papers/full-length/15.pdf > Slightly less than 50% of IPv6 traffic comes from a MacOS client (fig > 3); about 90% MacOS hits is 6to4, which possibly means (to me) that this > piece of 6to4 MacOS software of yours represents a third of global IPv6 > traffic. > > Would you care to comment on the numbers? p1. Those numbers are badly outdated. p2. Hits originating from Mac OS X hosts with their 6to4 tunnels disabled probably account for much of that traffic when it was measured. At that time, Apple's operating systems were the most commonly deployed implementations with IPv6 stacks enabled and running in the stock install. That isn't true any more. p3. Recent measurements of hits originating from Mac OS X hosts on 6to4 prefixed networks are dramatically smaller than when those measurements were taken, because Apple has updated Mac OS X 10.6 and 10.7 with significantly different behavior that will avoid using broken or underperforming 6to4 links. p4. Yes, older gear remains in the field, and some of it doesn't even have a software upgrade path. That gear, no doubt, accounts for a substantial portion of admittedly not very large flows through public 6to4 relays at present. I think the measurements we've all seen at the technical plenary show that 6to4 is a small percentage of the total world IPv6 traffic now, which again is an embarrassingly small fraction of global Internet traffic. p5. We should all be mindful that we're talking about a very small, and as far as I can tell, a not very critical segment of anybody's user base. Which, nevertheless, is still somehow to blame for holding up the global roll-out of IPv6 content. (I'm not sure even the legendary Gnomes of Zürich could do that.) What else is there to say? Oh, I remember now. Those of you 6to4-haters with Lion installed now. Please open a Terminal.app window and type this command: $ sudo sysctl -w net.inet6.icmp6.nd6_accept_6to4=0 That will make the IPv6 stack treat all Prefix Information Options with 2002::/16 prefixed addresses in them as if the A bit is always zero. The system will not auto-configure any 6to4 addresses on any interfaces, even a stf interface. Oh, you want that all the time? Add a line to /etc/sysctl.conf. Done. No more 6to4 for you. Anywhere. Let me know if that changes anything noticeably to the better for you. (On the plus side, it should spare you from suffering any indignity at the hands of a 6to4-PMT service.) -- james woodyatt <jhw@xxxxxxxxx> member of technical staff, core os networking _______________________________________________ Ietf mailing list Ietf@xxxxxxxx https://www.ietf.org/mailman/listinfo/ietf