[ipv6hackers] Need some URLs for detecting a valid IPv6 connection

[Doug Barton]

I'm trying to help advise someone working on an open source project who
would like to know a reliable way to determine if a client system has a
valid IPv6 connection (not necessarily by asking the OS, which as we all
know may lie). Essentially a happy eyeballs lite. Can anyone recommend a
good reference for that? The project runs on Linux, BSD, OS X, and
Windows, but even a general reference that discusses the concepts would
be a good start.

TIA,

Doug

[Mark ZZZ Smith]

I was under the impression that Network Connectivity Status Indicator was an IPv6 only check, used on Windows boot since Vista, however it seems it is available over both an IPv4 and IPv6. Limiting a connection attempt to IPv6 only would of course be an IPv6 only check.

"Appendix K: Network Connectivity Status Indicator and Resulting Internet Communication in Windows Vista"
https://technet.microsoft.com/en-us/library/cc766017(v=ws.10).aspx

Google have this IPv6 only test site:


http://ipv6test.google.com/

which according to the date on this non-Google blog has been around since 2011.

http://googlesystem.blogspot.com.au/2011/06/googles-ipv6-test.html


It is still listed in Google's IPv6 FAQ, so it'll probably stay around:

https://www.google.com/intl/en/ipv6/faq.html









----- Original Message -----
From: Doug Barton <***@dougbarton.email>
To: ***@lists.si6networks.com
Cc:
Sent: Thursday, 19 February 2015, 3:37
Subject: [ipv6hackers] Need some URLs for detecting a valid IPv6 connection

I'm trying to help advise someone working on an open source project who
would like to know a reliable way to determine if a client system has a
valid IPv6 connection (not necessarily by asking the OS, which as we all
know may lie). Essentially a happy eyeballs lite. Can anyone recommend a
good reference for that? The project runs on Linux, BSD, OS X, and
Windows, but even a general reference that discusses the concepts would
be a good start.

TIA,

Doug

[Torbjörn Eklöv]

Or this - http://test-ipv6.se/ , original is at http://test-ipv6.com/ but I have so few visitors at my .se mirror. :)

Great site with some explanation and error detection.

/Tobbe

Post by Mark ZZZ Smith
I was under the impression that Network Connectivity Status Indicator was an IPv6 only check, used on Windows boot since Vista, however it seems it is available over both an IPv4 and IPv6. Limiting a connection attempt to IPv6 only would of course be an IPv6 only check.
"Appendix K: Network Connectivity Status Indicator and Resulting Internet Communication in Windows Vista"
https://technet.microsoft.com/en-us/library/cc766017(v=ws.10).aspx
http://ipv6test.google.com/
which according to the date on this non-Google blog has been around since 2011.
http://googlesystem.blogspot.com.au/2011/06/googles-ipv6-test.html
https://www.google.com/intl/en/ipv6/faq.html
----- Original Message -----
Sent: Thursday, 19 February 2015, 3:37
Subject: [ipv6hackers] Need some URLs for detecting a valid IPv6 connection
I'm trying to help advise someone working on an open source project who
would like to know a reliable way to determine if a client system has a
valid IPv6 connection (not necessarily by asking the OS, which as we all
know may lie). Essentially a happy eyeballs lite. Can anyone recommend a
good reference for that? The project runs on Linux, BSD, OS X, and
Windows, but even a general reference that discusses the concepts would
be a good start.
TIA,
Doug
_______________________________________________
Ipv6hackers mailing list
http://lists.si6networks.com/listinfo/ipv6hackers
_______________________________________________
Ipv6hackers mailing list
http://lists.si6networks.com/listinfo/ipv6hackers

Torbjörn Eklöv | Interlan Gefle AB
Norra Kungsgatan 5, 803 20 Gävle
Växel: 026-18 50 00 | Direkt: 070-683 51 75
http://www.dnssecandipv6.se
http://ipv6only.se
http://test-ipv6.se

[Marco Davids (SIDN)]

Or this:

http://ipv6-test.com/

(I like the ICMP test, that some of the others are lacking)

--
Marco

Post by Torbjörn Eklöv
Or this - http://test-ipv6.se/ , original is at http://test-ipv6.com/ but I have so few visitors at my .se mirror. :)
Great site with some explanation and error detection.
/Tobbe

Post by Mark ZZZ Smith
I was under the impression that Network Connectivity Status Indicator was an IPv6 only check, used on Windows boot since Vista, however it seems it is available over both an IPv4 and IPv6. Limiting a connection attempt to IPv6 only would of course be an IPv6 only check.
"Appendix K: Network Connectivity Status Indicator and Resulting Internet Communication in Windows Vista"
https://technet.microsoft.com/en-us/library/cc766017(v=ws.10).aspx
http://ipv6test.google.com/
which according to the date on this non-Google blog has been around since 2011.
http://googlesystem.blogspot.com.au/2011/06/googles-ipv6-test.html
https://www.google.com/intl/en/ipv6/faq.html
----- Original Message -----
Sent: Thursday, 19 February 2015, 3:37
Subject: [ipv6hackers] Need some URLs for detecting a valid IPv6 connection
I'm trying to help advise someone working on an open source project who
would like to know a reliable way to determine if a client system has a
valid IPv6 connection (not necessarily by asking the OS, which as we all
know may lie). Essentially a happy eyeballs lite. Can anyone recommend a
good reference for that? The project runs on Linux, BSD, OS X, and
Windows, but even a general reference that discusses the concepts would
be a good start.
TIA,
Doug
_______________________________________________
Ipv6hackers mailing list
http://lists.si6networks.com/listinfo/ipv6hackers
_______________________________________________
Ipv6hackers mailing list
http://lists.si6networks.com/listinfo/ipv6hackers

Torbjörn Eklöv | Interlan Gefle AB
Norra Kungsgatan 5, 803 20 Gävle
Växel: 026-18 50 00 | Direkt: 070-683 51 75
http://www.dnssecandipv6.se
http://ipv6only.se
http://test-ipv6.se

[randy]

http://ipv6.cns.vt.edu/

-randy

Post by Marco Davids (SIDN)
http://ipv6-test.com/
(I like the ICMP test, that some of the others are lacking)
--
Marco

Post by Torbjörn Eklöv
Or this - http://test-ipv6.se/ , original is at http://test-ipv6.com/

but I have so few visitors at my .se mirror. :)

Post by Torbjörn Eklöv
Great site with some explanation and error detection.
/Tobbe

Post by Mark ZZZ Smith
I was under the impression that Network Connectivity Status Indicator

was an IPv6 only check, used on Windows boot since Vista, however it seems
it is available over both an IPv4 and IPv6. Limiting a connection attempt
to IPv6 only would of course be an IPv6 only check.

Post by Torbjörn Eklöv

Post by Mark ZZZ Smith
"Appendix K: Network Connectivity Status Indicator and Resulting

Internet Communication in Windows Vista"

Post by Torbjörn Eklöv

Post by Mark ZZZ Smith
https://technet.microsoft.com/en-us/library/cc766017(v=ws.10).aspx
http://ipv6test.google.com/
which according to the date on this non-Google blog has been around

since 2011.

Post by Torbjörn Eklöv

Post by Mark ZZZ Smith
http://googlesystem.blogspot.com.au/2011/06/googles-ipv6-test.html
https://www.google.com/intl/en/ipv6/faq.html
----- Original Message -----
Sent: Thursday, 19 February 2015, 3:37
Subject: [ipv6hackers] Need some URLs for detecting a valid IPv6

connection

Post by Torbjörn Eklöv

Post by Mark ZZZ Smith
I'm trying to help advise someone working on an open source project who
would like to know a reliable way to determine if a client system has a
valid IPv6 connection (not necessarily by asking the OS, which as we all
know may lie). Essentially a happy eyeballs lite. Can anyone recommend a
good reference for that? The project runs on Linux, BSD, OS X, and
Windows, but even a general reference that discusses the concepts would
be a good start.
TIA,
Doug
_______________________________________________
Ipv6hackers mailing list
http://lists.si6networks.com/listinfo/ipv6hackers
_______________________________________________
Ipv6hackers mailing list
http://lists.si6networks.com/listinfo/ipv6hackers

Torbjörn Eklöv | Interlan Gefle AB
Norra Kungsgatan 5, 803 20 Gävle
Växel: 026-18 50 00 | Direkt: 070-683 51 75
http://www.dnssecandipv6.se
http://ipv6only.se
http://test-ipv6.se

_______________________________________________
Ipv6hackers mailing list
http://lists.si6networks.com/listinfo/ipv6hackers

[Greg Troxel]

Post by Doug Barton
I'm trying to help advise someone working on an open source project
who would like to know a reliable way to determine if a client system
has a valid IPv6 connection (not necessarily by asking the OS, which
as we all know may lie). Essentially a happy eyeballs lite. Can anyone
recommend a good reference for that? The project runs on Linux, BSD,
OS X, and Windows, but even a general reference that discusses the
concepts would be a good start.

I suspect this isn't really about IPv6, and the same issue would arise
in systems where all real work was done over v6 and v4 in theory should
work but sometimes doesn't.

"valid IPv6 connection" is a complicated notion. I think what is really
meant is "if I send IPv6 packets to some arbitrary public address that
is in good working order, will it work", which is about not just my
local behavior but about routing. Plus, it has the difficulty of
presuming the other end is in good shape. It's only when the world is
99% working that one can talk about a node working or not working.
Otherwise there's a more complicated notion of what fraction of the
other nodes can be reached.

Another problem is that ping results do not always predict the use of
other ports/protocols in the presence of firewalls. I have specifically
seen the mac happy eyeballs code choose IPv4 for ssh (ping was slightly
faster on v4 than v6) but lose because v4 and not v6 was firewalled.

Definitely something to avoid is sending a probe to some well-known
place, as your program then has a phones-home bug.

I think what's needed is a library to scoreboard results from trying to
connect to various places (that the user of the program has asked to
connect to, otherwise it's a privacy leak) over various protocols, that
can then suggest which to try first. So it really is the happy eyeballs
approach.

It would probably help if you explain the reason the OP is asking.