I posted traceroutes for Project Gutenberg and iBiblio on the iBiblio
   Q&A page I linked to earlier.
   https://answers.ibiblio.org/questions/1701/cant-connect-to-ibiblio-webs
   ite-or-gutenbergorg-wh.html


   Do you think this could have something to do with the problem?
   [1]http://help.unc.edu/help/campus-ipv6-policy/ Specifically, the part
   where they say “We reserve the right to refuse any non-global or
   non-native (i.e. tunneled) IPv6 address.” Also, the box that’s labeled
   “Examples of IPv6 addresses that are discouraged:”




   From: [2]Greg Newby
   Sent: Saturday, July 30, 2016 8:24 PM
   To: [3]Paul Tow
   Cc: [4]gutvol-w@lists.pglaf.org
   Subject: Re: [gutvol-w] Project Gutenberg site not working over IPv6
   tunnel


   Dear Paul,


   Yes, a traceroute would be useful.  The reddit discussion shows one of
   the correct IPv6 addresses (2610:28:3090:3000:0:bad:cafe:47).  We use
   some squid proxies, and serve both http and https.  So, there are a few
   different addresses that may be correct.


   We have had no other reports of IPv6 problems.  I'm not sure when we
   implemented it for www.gutenberg.org, but it was within the last year.


   Further details are welcome.  We'll follow up with ibiblio.  The UNC
   campus (where ibiblio is located) has been found to have some rather
   aggressive border firewalls and related technologies, and it might be
   that some traffic is not being passed (as you speculated, with ICMPv6).


   Thanks for reporting this.

     - Greg Newby


   On Sat, Jul 30, 2016 at 02:26:45PM -0500, Paul Tow wrote:

   > Yes, I get the same problem with the main iBiblio home page. I had
   contacted iBiblio as well:
   https://answers.ibiblio.org/questions/1701/cant-connect-to-ibiblio-webs
   ite-or-gutenbergorg-wh.html

   >

   > As of today, two people in the Reddit discussion have said they???ve
   been able to access Project Gutenberg over their IPv6 tunnel, but I
   still cannot. One of them said he???s using a tunnel from Hurricane
   Electric, and the other one hasn???t yet said. I???m using the 6rd
   tunnel provided automatically by AT&T, and I can???t connect.

   >

   > I suppose I should provide iBiblio with a traceroute.

   >

   >

   >

   > From: Michael Dyck

   > Sent: Saturday, July 30, 2016 8:45 AM

   > To: gutvol-w@lists.pglaf.org

   > Subject: Re: [gutvol-w] Project Gutenberg site not working over IPv6
   tunnel

   >

   > On 16-07-29 11:00 PM, Paul Tow wrote:

   > > For a long while now, a technical issue with the Project Gutenberg
   website

   > > has been making it completely inaccessible to a large number of
   Internet

   > > users. [...]

   > >

   > > - Forum thread I started to figure out this issue with Project
   Gutenberg:

   > >
   https://www.reddit.com/r/ipv6/comments/4v8ncz/project_gutenberg_not_wor
   king_over_ipv6/

   >

   > www.gutenberg.org is hosted at ibiblio.org. A post near the bottom of
   the

   > reddit thread suggests that this might be an ibiblio-wide problem. Do
   you

   > get the same failure-to-connect behavior for other ibiblio pages?

   >

   > -Michael


   Dr. Gregory B. Newby

   Chief Executive and Director

   Project Gutenberg Literary Archive Foundation www.gutenberg.org

   A 501(c)(3) not-for-profit organization with EIN 64-6221541

   gbnewby@pglaf.org

References

   1. http://help.unc.edu/help/campus-ipv6-policy/
   2. mailto:gbnewby@pglaf.org
   3. mailto:macskeeball@gmail.com
   4. mailto:gutvol-w@lists.pglaf.org