[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]
Re: Emacs can't reach dx.doi.org?
From: |
Simon Leinen |
Subject: |
Re: Emacs can't reach dx.doi.org? |
Date: |
Mon, 21 Mar 2016 21:24:20 +0100 |
On Mon, Mar 21, 2016 at 8:58 PM, Clément Pit--Claudel
<address@hidden> wrote:
> On 03/19/2016 05:23 AM, Andreas Schwab wrote:
>> Clément Pit--Claudel <address@hidden> writes:
>>
>>> (url-retrieve
>>> "http://dx.doi.org/10.1016/s0262-4079(08)62292-7"
>>> (lambda (&rest args) (message "args: %S" args)))
>>>
>>> I get 'Contacting host: dx.doi.org:80', and nothing. After a few calls
>>> list-processes shows this:
>>
>> Do you have IPv6 connectivity problems? What does `telnet dx.doi.org 80'
>> do?
>
> I'm running into this again today, and it seems that you were right! Thanks:
>
> $ telnet dx.doi.org 80
> Trying 2001:550:100:6::138:162...
>
> (hangs for a while)
Works from here:
: address@hidden; telnet dx.doi.org 80
Trying 2001:550:100:6::138:163...
Connected to dx.doi.org.
Escape character is '^]'.
^]
telnet> close
Connection closed.
> 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. 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.
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
--
Simon.
: address@hidden; traceroute6 -I dx.doi.org
traceroute6: Warning: dx.doi.org has multiple addresses; using
2001:550:100:6::138:162
traceroute6 to dx.doi.org (2001:550:100:6::138:162) from
2001:620:0:69::101, 64 hops max, 16 byte packets
1 vpngw-b.switch.ch 15.884 ms 11.575 ms 10.809 ms
2 swiofw1-v15.switch.ch 10.861 ms 9.493 ms 14.564 ms
3 swiws2-v910.switch.ch 11.518 ms 11.757 ms 15.242 ms
4 swiws1-v640.switch.ch 13.000 ms 16.052 ms 10.730 ms
5 swiez1-10ge-4-15.switch.ch 11.239 ms 11.567 ms 22.094 ms
6 swiba2-10ge-1-4.switch.ch 21.159 ms 10.761 ms 14.005 ms
7 2001:978:2:3e::2:1 12.614 ms 15.255 ms 26.509 ms
8 te0-0-0-1.agr12.zrh01.atlas.cogentco.com 17.263 ms 16.212 ms 21.287 ms
9 *
te0-7-0-35.ccr21.zrh01.atlas.cogentco.com 15.346 ms 15.956 ms
10 be2295.ccr41.par01.atlas.cogentco.com 33.689 ms 43.170 ms 30.533 ms
11 be2746.ccr41.jfk02.atlas.cogentco.com 103.163 ms 96.974 ms 100.221 ms
12 be2806.ccr41.dca01.atlas.cogentco.com 105.293 ms * 103.563 ms
13 te0-0-1-0.rcr21.iad03.atlas.cogentco.com 112.268 ms 108.030 ms 105.387 ms
14 te0-0-2-3.agr11.iad03.atlas.cogentco.com 110.695 ms 159.057 ms 106.802 ms
15 2001:550:100:6::138:162 104.891 ms 113.060 ms 122.931 ms