Yahoo and IPv6

Voll, Toivo toivo at
Tue May 31 21:31:52 UTC 2011

Going to and hitting "Start IPv6 Test" I get:
"Your system will continue to work for you on World IPv6 day. However, we found that your server only supports IPv4 at this time. You'll simply continue to use IPv4 to reach your favorite web sites."

Netalyzr ( finds no issues with my IPv6 status, but alerts me to the fact (since confirmed by switching to IE) that Google Chrome defaults to IPv4 rather than IPv6, and consequently a lot of the testing tools claim that my IPv6 is broken. 

Toivo Voll
Network Administrator
Information Technology Communications
University of South Florida

-----Original Message-----
From: Brandon Ross [mailto:bross at] 
Sent: Monday, May 09, 2011 12:25
To: Arie Vayner
Cc: nanog at
Subject: Re: Yahoo and IPv6

Even more disturbing than that is that when I run a test from here it says 
that I have broken v6.  But I don't have broken v6 and proves 
it with a 10/10.  This Yahoo tool doesn't seem to even give a hint as to 
what it thinks is broken.

Can anyone from Yahoo shed some light on what this tool is doing and how 
to get it to tell us what it thinks is broken?

Brandon Ross                                              AIM:  BrandonNRoss
                                                                ICQ:  2269442
                                    Skype:  brandonross  Yahoo:  BrandonNRoss

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