[tex-live] www.tug.org unreachable

Zdenek Wagner zdenek.wagner at gmail.com
Mon Dec 18 23:53:40 CET 2017


Hi all,

it seems to me that the problem is at the router at position 7 in the
traceroute output sent by Denis. Yo can see that if responds only once, the
next two attmpts fail, and when TTL is set to 11 hops, two different paths
are attempted. I tried to access this router just now and it is
inaccessible. Or probably the problem is even on router 6 that should have
never tried the next one and use another path. It is definitely not a
problem of DNS because my computer finds the same IP address. So DNS
spoofing is not the problem. This is my trace:

$ traceroute www.tug.org
traceroute to www.tug.org (91.121.174.77), 30 hops max, 60 byte packets
 1  gate.czw57 (192.168.1.1)  9.945 ms  9.936 ms  9.931 ms
 2  62-141-11-99.tmcz.cz (62.141.11.99)  10.023 ms  10.235 ms  16.212 ms
 3  62-141-13-18.tmcz.cz (62.141.13.18)  16.271 ms  19.412 ms  23.496 ms
 4  62.168.52.65 (62.168.52.65)  22.326 ms  24.754 ms  28.199 ms
 5  ae-2.fra2027-ex1.gtsce.net (193.85.195.94)  35.877 ms  39.003 ms
41.273 ms
 6  * * *
 7  be103.rbx-g1-nc5.fr.eu (178.33.100.158)  60.547 ms  58.720 ms  62.512 ms
 8  * * *
 9  vl10.rbx-g3-a72.fr.eu (94.23.122.73)  55.899 ms  54.242 ms  56.437 ms
10  * * *
11  tug.org (91.121.174.77)  37.863 ms !X  37.069 ms !X  39.435 ms !X

Now, comparing again my route with that found by Denis, I see that
vl10.rbx-g3-a72.fr.eu is on the right path but Denis is sometimes sent by
router #7 to a wrong direction. Both http, https, and ftp are TCP services
and establishing a connection requires sending several packets. If they do
not go correctly to the server, connection will never be established.


Zdeněk Wagner
http://ttsm.icpf.cas.cz/team/wagner.shtml
http://icebearsoft.euweb.cz

2017-12-18 23:33 GMT+01:00 Zdenek Wagner <zdenek.wagner at gmail.com>:

> 2017-12-18 23:27 GMT+01:00 Alan Litchfield <alan at alphabyte.co.nz>:
>
>> Given that is the case, has you tried using OpenDNS?
>>
>
> DNS is not the problem. The problem is that a router finds a way to the IP
> address through inaccessible routers.
>
>>
>> Alan
>> --
>> Dr Alan Litchfield
>> AlphaByte
>> PO Box 1941
>> Auckland, New Zealand 1140
>>
>
>
>
> Zdeněk Wagner
> http://ttsm.icpf.cas.cz/team/wagner.shtml
> http://icebearsoft.euweb.cz
>
>
>
>>
>> On 19/12/2017, at 11:22, Reinhard Kotucha <reinhard.kotucha at web.de>
>> wrote:
>>
>> On 2017-12-18 at 22:10:45 +0100, Denis Bitouzé wrote:
>>
>> Le 18/12/17 à 21h44, Rick Graham a écrit :
>>
>> ... I'm also curious to know if the TOR Browser
>> <https://www.torproject.org/projects/torbrowser.html.en> works for you,
>> since it will most assuredly take a different path, etc., to
>> www.tug.org.
>>
>>
>> Bingo! That works :)
>>
>>
>> Denis, the actual problem is not solved so far, sorry.
>>
>> When you start the Tor browswer, it says, for instance
>>
>>  Your IP address appears to be: 62.212.73.141
>>
>> But this IP address is not yours and you get another one when you
>> start the browser again.
>>
>> What happens is that your browser connects to this remote machine and
>> the remote machine sends your requests to www.tug.org and sends you
>> the results.  This works, of course, because
>>
>>  http://downforeveryoneorjustme.com
>>
>> already told you that everbody except you can access www.tug.org .
>>
>> Using the Tor browser is probably a nice workaround for http(s) and
>> ftp but it doesn't help if you need rsync, for example.
>>
>> I guess we can conclude neither my router nor my configuration are
>> the culprits...
>>
>>
>> I can't imagine that there is something wrong at your site because you
>> said that everything else works fine.
>>
>> BTW, tug.org and preining.info have completely different IP-numbers:
>>
>>  tug.org:         91.121.174.77
>>  preining.info:   142.4.209.99
>>
>> Maybe one of the routers between Calais and Roubaix is
>> screwed up.  Can anybody tell me what * * * means in the output of
>> traceroute?
>>
>> Regards,
>>  Reinhard
>>
>> --
>> ------------------------------------------------------------------
>> Reinhard Kotucha                            Phone: +49-511-3373112
>> <+49%20511%203373112>
>> Marschnerstr. 25
>> <https://maps.google.com/?q=Marschnerstr.+25+D-30167+Hannover&entry=gmail&source=g>
>> D-30167 Hannover
>> <https://maps.google.com/?q=Marschnerstr.+25+D-30167+Hannover&entry=gmail&source=g>
>>                    mailto:reinhard.kotucha at web.de
>> <reinhard.kotucha at web.de>
>> ------------------------------------------------------------------
>>
>>
>>
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://tug.org/pipermail/tex-live/attachments/20171218/9d9ca79f/attachment.html>


More information about the tex-live mailing list