ipv6.google.com
Google is reachable via IPv6 : http://ipv6.google.com/
So far, it's only their search engine, not any of their apps. And none of their nameservers are reachable via IPv6 yet. But it's a start.
I keep hearing that IPv6 will only be "successful" when the major web sites (google, yahoo, facebook, ebay, paypal, etc) start using it. This is a big step in the right direction.
I should point out that latency over IPv6 is terrible (from AS3999): 20.6 ms over IPv4 -vs- 251.3 ms over IPv6. It looks like the Internet2 → Global Crossing → Google routing is still very sub-optimal:
$ traceroute6 -n ipv6.google.com
traceroute6 to ipv6.l.google.com (2001:4860:0:1001::68) from 2610:8:6800:1::408, 30 hops max, 12 byte packets
1 2610:8:6800:1::1 39.817 ms 10.278 ms 10.136 ms
2 2001:5e8::fffe:0:1:4:102 10.058 ms 10.055 ms 10.049 ms
3 2001:5e8::fffe:0:1:4:101 10.048 ms 10.045 ms 9.395 ms
4 2001:5e8:0:1::1:fd 10.704 ms * 6.579 ms
5 2001:5e8::fffd:0:2:2:2 14.951 ms 18.307 ms 12.993 ms
6 2001:468:ff:109::1 30.25 ms 26.884 ms 36.155 ms
7 2001:468:ff:103::1 48.942 ms 51.061 ms 48.879 ms
8 2001:468:ff:304::2 81.231 ms 85.703 ms 87.645 ms
9 3ffe:80a::c 98.942 ms 90.235 ms 98.992 ms
10 2001:450:2001:1000::670:1708:179 335.792 ms 168.063 ms 174.705 ms
11 2001:7f8:1::a501:5169:1 251.204 ms 248.744 ms 250.161 ms
12 * * *
13 2001:4860:0:1001::68 246.633 ms 249.771 ms 248.692 ms
(As an aside, why is there a 6bone address (3ffe:80a::c) in there? The 6bone address space was deprecated years ago.)traceroute6 to ipv6.l.google.com (2001:4860:0:1001::68) from 2610:8:6800:1::408, 30 hops max, 12 byte packets
1 2610:8:6800:1::1 39.817 ms 10.278 ms 10.136 ms
2 2001:5e8::fffe:0:1:4:102 10.058 ms 10.055 ms 10.049 ms
3 2001:5e8::fffe:0:1:4:101 10.048 ms 10.045 ms 9.395 ms
4 2001:5e8:0:1::1:fd 10.704 ms * 6.579 ms
5 2001:5e8::fffd:0:2:2:2 14.951 ms 18.307 ms 12.993 ms
6 2001:468:ff:109::1 30.25 ms 26.884 ms 36.155 ms
7 2001:468:ff:103::1 48.942 ms 51.061 ms 48.879 ms
8 2001:468:ff:304::2 81.231 ms 85.703 ms 87.645 ms
9 3ffe:80a::c 98.942 ms 90.235 ms 98.992 ms
10 2001:450:2001:1000::670:1708:179 335.792 ms 168.063 ms 174.705 ms
11 2001:7f8:1::a501:5169:1 251.204 ms 248.744 ms 250.161 ms
12 * * *
13 2001:4860:0:1001::68 246.633 ms 249.771 ms 248.692 ms
If I had to guess, I'd say that the IPv6 servers are in Europe, since 2001:7f8:1::/48 is assigned to the AMS-IX Exchange Point.
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From my server in Nuremberg (Germany) IPv4 pings in 14ms and IPv6 pings in 118ms, with 12 hops.
On the other hand, from my home in Milan (Italy), the roundtrip is similar*: around 72ms both on IPv4 and IPv6 (it's an interleaved ADSL, so 50ms are lost in the first hop).
* I have that time only for the 2001:4860:0:1001::68 address, while 2001:4860:0:2001::68 pings in 150ms; both routes are 6 hops long and all the "extra" time is lost in the last hop.
It would appear that Cisco.com is also accessible over IPv6 at http://www.ipv6.cisco.com/
I can barely connect to http://www.ipv6.cisco.com/. The connection has extremely high latency for me.
Note that you can access most of the Google Apps by pointing their hostname to the same IPv6 address in /ect/hosts. Like:
2001:4860:0:1001::68 gmail.com mail.google.com
Now you've got GMail over IPv6!
Today I noticed that new IPv6 servers are used (at least for me) by google. The 'cache-link' contains an IPv6 address: http://[2001:4860:0:1001::28]/search?q=cache:YqLrl1H-aFgJ:nl.wikipedia.org/wiki/Internet_Protocol_Version_6+ipv6&hl=nl&ct=clnk&cd=1&gl=nl
Cool! I see it too.
Google now offers it's services via IPv6 to ISPs:
http://www.google.com/intl/en/ipv6/faq.html
I couldn't connect with IPv6. How to connect my network to IPv6?
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Franklyn,
If your ISP does not offer native IPv6, you can setup a tunnel from a tunnelbroker. Hurricane Electric has a good tunnel broker service.