I believe the problem Yahoo is talking about in regards to "broken" IPv6 networks. It really comes down to your network would break for 0.078% of the people trying to reach their site via IPv6. Broken in this case means; ...."the user has a broken home gateway, or a broken firewall or his Web browser has a timeout that's between 21 and 186 seconds, which we consider to be broken. That's a lot of breakage, and that is a very big barrier for content providers to support IPv6." http://www.pcworld.idg.com.au/article/341178/yahoo_proposes_really_ugly_hack... On 5/9/2011 12:25 PM, Valdis.Kletnieks@vt.edu wrote:
On Mon, 09 May 2011 18:16:20 +0300, Arie Vayner said:
Actually, I have just noticed a slightly more disturbing thing on the Yahoo IPv6 help page...
I have IPv6 connectivity through a HE tunnel, and I can reach IPv6 services (the only issue is that my ISP's DNS is not IPv6 enabled), but I tried to run the "Start IPv6 Test" tool at http://help.yahoo.com/l/us/yahoo/ipv6/ and it says: "We detected an issue with your IPv6 configuration. On World IPv6 Day, you will have issues reaching Yahoo!, as well as your other favorite web sites. The *really* depressing part is that it says the same thing for me, on a *known* working IPv6 network.
And then when I retry it a few minutes later, with a tcpdump running, it works.
And then another try says it failed, though tcpdump shows it seems to work.
For what it's worth, the attempted download file is:
% wget http://v6test.yahoo.com/eng/test/eye-test.png --2011-05-09 11:44:39-- http://v6test.yahoo.com/eng/test/eye-test.png Resolving v6test.yahoo.com... 2001:4998:f00d:1fe::2000, 2001:4998:f00d:1fe::2002, 2001:4998:f00d:1fe::2003, ... Connecting to v6test.yahoo.com|2001:4998:f00d:1fe::2000|:80... connected. HTTP request sent, awaiting response... 200 OK Length: unspecified [image/png] Saving to: `eye-test.png.1'
[<=> ] 2,086 --.-K/s in 0s
2011-05-09 11:44:39 (154 MB/s) - `eye-test.png.1' saved [2086]
Looking at the Javascript that drives the test, it appears the *real* problem is that they set a 3 second timeout on the download - which basically means that if you have to retransmit either the DNS query or the TCP SYN, you're dead as far as the test is concerned.
-- Scott Helms Vice President of Technology ISP Alliance, Inc. DBA ZCorum (678) 507-5000 -------------------------------- http://twitter.com/kscotthelms --------------------------------