FYI.  Here's a follow up.

RHEL 6 can serve NFS over IPv6.  An RHEL6 client can mount a file system exported by an RHEL6 server and you can see that IPv6 is used by looking at netstat.

Also, vmWare v4 can mount NFS over IPv6.  I created a VMkernel port with just an IPv6 address, and added a datastore.  Netstat shows that vmWare is getting the datastore through IPv6 from my RHEL 6.1 server.

Really cool!

Is there a free linux (Ubuntu and/or RHEL) vncserver which works with IPv6?  From what I can see, the normal VNC RPMs contain the Free Edition of RealVNC which does not have IPv6 support.  The Enterprise Edition looks like it supports IPv6, but that costs $50 a server.  RealVNC is also the only program that I could find which supported IPv6 as a Windows client, and that's also $50.00, unfortunately, I can't afford both client and server, especially since I have multiple IPv6 servers that I want to interact with.

There was a TightVNC port with IPv6 (http://jungla.dit.upm.es/~acosta/paginas/vncIPv6.html), but that web page is dead.

That depends on your OS.  In FreeBSD, Telnet listens on both IPv6 and IPv4

I was speaking in terms of the nfs port.  Telnet to port 2049 (nfsd) over IPv4 connects, telnet to port 2049, IPv6, does not.  That's a simple test I use to see if a program allows connections over TCP/IP.

$ telnet localhost 2049
Trying 127.0.0.1...
Connected to localhost.localdomain (127.0.0.1).
Escape character is '^]'.
^]
telnet> quit
Connection closed.
$ telnet localhost6 2049
telnet: connect to address ::1: Connection refused
telnet: Unable to connect to remote host: Connection refused
$

Is there any OS support out there for NFS over IPv6?  I've checked SusE Linux, RHEL, Ubuntu and Windows and none of them do, from what I can tell.  My test is to start the NFS server and run "netstat -a".  I see a process listening for the nfs service over TCP and UDP on IPv4, but not in IPv6.  I also have tested via telnet.  Telnet will connect over an IPv4 address but not IPv6.

VMWare ESX supports IPv6 addresses for its VMK interfaces so, presumably, it could mount IPv6 NFS data stores -- if I could find anyone to serve them.

Does anyone have comments about printers that support IPv6?  I want to purchase a new network all-in-one printer for my home office and I want to go with IPv6.

Brother has several printers which advertise IPv6 and their manuals include a few pages of IPv6 settings.  The MFC-6940CW looks nice.

Canon might have some IPv6 support.  They don't list it in their web pages, that I could find, but the PIXMA MP560 and MP990 Network Troubleshooting manuals have an IPv6 button in a picture.  No text.  So, the impression I get is that IPv6 is a little premature there.

I went through the HP printer selection wizard and couldn't find anything below $1K.  I think they have a good history of IPv6 support in their commercial printers.

So, Brother seems to be the best in advertising and documenting.  How are they in implementation?

Sorry, what would $_SERVER[REMOTE_ADDR] be useful for?
I think HE already includes an HTTP over IPv6 connectivity test.   This was recently mentioned in another topic.

Another thing that would be cool is to make a VoIP call into HE.  Or have us accept one from HE over IPv6.  Even more fun would be for HE to make a call to me and require that it be done over IPSec.

Yes, it would be easier to get a file, then to put one.  The file could be as simple as a one line text file with a URL in it.  The test would be to retrieve the file (using IPv6 and the appropriate protocol), cut-and-paste the contained URL into a browser and navigate.  The URL would cause your certification record to be updated.  A daily cron job could update the URL with a random code-of-the-day, to avoid cheating.

Would people (and HE) be comfortable logging in with HE certification credentials? Anonymous FTP could be used, if not, but what about SSH?

Some ideas to test connectivity from IPv6 clients into an IPv6 server (i.e. one of HE's):

Have the user
* Connect to the Certification web site through IPv6;
* FTP a file onto an IPv6-only ftp server (which HE hosts);
* SCP a file to an IPv6-only ssh server;
* Send an e-mail to an IPv6-only address (hosted and monitored by HE).

For FTP and SCP, the user could get files instead (and report the secret code, as in the existing e-mail test).

Does snmptrap support IPv6?

These tests would raise awareness of the protocols supported by IPv6.

---

An advanced test (guru or sage level) would be to repeat the tests (or at least one) using an IPv6 address secured with IPSec.

The mobile aspects of IPv6 are also very interesting.  Perhaps we could access a web page from a mobile IPv6, move to another location and access again with our device IP preserved (and a care-of IP on a different subnet).  But I see two problems with that -- first, I don't know of any devices to test with; and second, it's hard to find a 2nd IPv6 location around here. :-)  Both of these problems would be really nice to solve.

I made a mistake and entered a computer name, instead of a domain, while completing the e-mail portion of the certification test.  I entered something like:
        johnDoe@foo.bar.com, instead of   johnDoe@bar.com.

Foo.bar.com is my mail server and I passed the test, but I think I was stuck with HE thinking that my domain is foo.bar.com for the remainder of the certification.  (I've since sent an e-mail to ipv6@he.net asking that this be corrected).

Some suggestions:

1) Check that an MX record exists for the domain;
2) Display the domain in the test web pages -- Subsequent levels highly depend on this domain value, and since I'm doing this in my spare time, it's easy to forget or become uncertain about what you think my domain is.
3) Allow me to edit the domain.

Also:

4) I'd like to repeat the tests.  After learning more of IPv6, because of the tests, I'm improving my system and re-certification seems like a good regression check.

5) On the multiple choice tests, the text says something like "You only answered 20 of 21".  That's wrong.  I answered them all, but only 20 were correct.

6) The radio buttons are very hard to use.  Maybe it's fat fingers, but it seems like some certification test gremlin is altering one answer or another at random.  Even though I know the answers, it's hard to click twenty+ radio buttons and keep them straight.  This is why (5) bugs me.

It'd be more coding for you, but perhaps on my 2nd try, give me my radio buttons back, pre-selected to whatever I submitted.  Then I can just concentrate on the wrong answers and easily resubmit the correct ones.

Thank you for providing the certification tests.