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Re: Emacs can't reach dx.doi.org?
From: |
Clément Pit--Claudel |
Subject: |
Re: Emacs can't reach dx.doi.org? |
Date: |
Mon, 21 Mar 2016 16:48:52 -0400 |
User-agent: |
Mozilla/5.0 (X11; Linux x86_64; rv:38.0) Gecko/20100101 Thunderbird/38.6.0 |
On 03/21/2016 04:24 PM, Simon Leinen wrote:
> Works from here:
Thanks for testing!
>> Is there anything I can do on my side to diagnose this?
>
> traceroute/traceroute6?
>
> You seem to have a public IPv6 address and/or an IPv6 default route,
> because otherwise telnet and other programs wouldn't try to connect
> over IPv6.
Indeed, I'm on MIT CSAIL's network.
> But maybe your IPv6 connectivity is broken/blocked by
> firewall/nonexistent. Or, if IPv6 generally works for you, there may
> be a routing problem further "upstream". As I said, traceroute{,6}
> might help. What is your IPv6 address? There are some IPv6 peering
> issues/disputes that may cause disconnectivity between some parts of
> the IPv6 Internet, maybe you are being hit by this. I see dx.doi.org
> behind Cogent, who are involved in these disputes.
Interesting, thanks for the background info! I'm raising the issue with MIT's
network admins.
> While the routing issue certainly isn't an Emacs problem, it would be
> nice if Emacs would notice the issue and quickly fall back to IPv4, as
> per the recommendations in RFC 6555. I assume IPv4 works for you?
> i.e. telnet -4 dx.doi.org 80
telnet -4 works fine indeed. It also works fine in Firefox. Could Emacs use the
same tricks as Firefox and fall back?
Clément.
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