Groups > comp.os.linux.networking > #2532

Re: Frustrated that I don't UNDERSTAND why my network times out

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From	Scott Hemphill <hemphill@hemphills.net>
Newsgroups	comp.os.linux.networking
Subject	Re: Frustrated that I don't UNDERSTAND why my network times out
References	<l2vumu$4bj$1@speranza.aioe.org> <uclcia-a42.ln1@llondel.org> <l33cq8$8vo$1@speranza.aioe.org> <nfeqrv7jhch6$.1b4wzraj6bnnf.dlg@40tude.net> <l33etf$eok$1@speranza.aioe.org> <l37l8k$v7v$1@speranza.aioe.org>
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Date	Mon, 14 Oct 2013 16:47:16 -0400
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billy <billy@is.invalid> writes:

> Below (sorry for the top post) is the old traceroute from yesterday on
> Microknoppix.
>
> Here is the new traceroute from a few seconds ago.
> The route is entirely different!
> Since *UNDERSTANDING* is what we're after, can you give me
> insight into *how* all of a sudden, the route is so very different
> (and why it works now)?
>
> Who decides what route my packets will take?
>
> knoppix@Microknoppix:~$ traceroute www.centos.org
> traceroute to www.centos.org (85.12.30.227), 30 hops max, 60 byte packets

[snip first routing]

>> root@Microknoppix:/# traceroute -M icmp centos.org
>> traceroute to centos.org (72.232.194.162), 30 hops max, 60 byte packets

[snip second routing]

It's not the routing, it's the destination.  Do you see the IP addresses
in each of the above two routes?  The first one works, and the second
one doesn't.

The question is why do you get two different IP addresses for the name
"centos.org"?  The answer is probably that the name resolution (DNS) is
screwed up somewhere.  You can get around this by editing /etc/hosts by
inserting the following line:

85.12.30.22   www.centos.org centos.org

This temporary fix will only work as long as they don't change their IP
address (again?).  Why did it work for TOR?  Because they use different
name servers than you do.

To address some of the other things mentioned in this thread: pings and
traceroutes can be blocked at any point along the route.  Successful
pings and traceroutes that go all the way to the destination tell you a
lot, but ping failures and traceroutes that don't go all the way don't
tell you so much.  They do not indicate a problem along the route, or at
the destination.

Also, the suggestion of too large an MTU wasn't a bad one.  It can cause
the symptoms you were seeing, but I think you've proven that it is not
your problem.  I haven't seen MTU issues in a long time, though.

Scott
-- 
Scott Hemphill	hemphill@alumni.caltech.edu
"This isn't flying.  This is falling, with style."  -- Buzz Lightyear

Thread

Frustrated that I don't UNDERSTAND why my network times out billy <billy@is.invalid> - 2013-10-08 03:32 +0000
  Re: Frustrated that I don't UNDERSTAND why my network times out "Gary R. Schmidt" <grschmidt@acm.org> - 2013-10-08 15:37 +1100
    Re: Frustrated that I don't UNDERSTAND why my network times out billy <billy@is.invalid> - 2013-10-09 14:26 +0000
      Re: Frustrated that I don't UNDERSTAND why my network times out Thomas Keusch <fwd+usenet-spam2013q4-1381444031@spam2013q4.bsd-solutions-duesseldorf.de> - 2013-10-10 22:32 +0000
  Re: Frustrated that I don't UNDERSTAND why my network times out David Hough <noone$$@llondel.org> - 2013-10-08 07:30 +0100
    Re: Frustrated that I don't UNDERSTAND why my network times out Chris Davies <chris-usenet@roaima.co.uk> - 2013-10-08 19:32 +0100
      Re: Frustrated that I don't UNDERSTAND why my network times out Tauno Voipio <tauno.voipio@notused.fi.invalid> - 2013-10-08 23:16 +0300
        Re: Frustrated that I don't UNDERSTAND why my network times out billy <billy@is.invalid> - 2013-10-09 17:39 +0000
          Re: Frustrated that I don't UNDERSTAND why my network times out Mike Easter <MikeE@ster.invalid> - 2013-10-09 11:28 -0700
            Re: Frustrated that I don't UNDERSTAND why my network times out billy <billy@is.invalid> - 2013-10-09 18:52 +0000
              Re: Frustrated that I don't UNDERSTAND why my network times out Tauno Voipio <tauno.voipio@notused.fi.invalid> - 2013-10-09 22:47 +0300
                Re: Frustrated that I don't UNDERSTAND why my network times out billy <billy@is.invalid> - 2013-10-09 20:50 +0000
                Re: Frustrated that I don't UNDERSTAND why my network times out unruh <unruh@invalid.ca> - 2013-10-09 21:30 +0000
                Re: Frustrated that I don't UNDERSTAND why my network times out billy <billy@is.invalid> - 2013-10-10 01:05 +0000
                Re: Frustrated that I don't UNDERSTAND why my network times out billy <billy@is.invalid> - 2013-10-10 01:09 +0000
              Re: Frustrated that I don't UNDERSTAND why my network times out unruh <unruh@invalid.ca> - 2013-10-09 19:51 +0000
                Re: Frustrated that I don't UNDERSTAND why my network times out billy <billy@is.invalid> - 2013-10-09 20:42 +0000
                Re: Frustrated that I don't UNDERSTAND why my network times out ~BD~ <~BD~@nomail.afraid.org> - 2013-10-09 22:09 +0100
                Re: Frustrated that I don't UNDERSTAND why my network times out billy <billy@is.invalid> - 2013-10-10 01:07 +0000
                Re: Frustrated that I don't UNDERSTAND why my network times out ~BD~ <~BD~@nomail.afraid.org> - 2013-10-10 07:41 +0100
                Re: Frustrated that I don't UNDERSTAND why my network times out unruh <unruh@invalid.ca> - 2013-10-09 21:36 +0000
              Re: Frustrated that I don't UNDERSTAND why my network times out Mike Easter <MikeE@ster.invalid> - 2013-10-09 15:51 -0700
                Re: Frustrated that I don't UNDERSTAND why my network times out unruh <unruh@invalid.ca> - 2013-10-10 00:15 +0000
                Re: Frustrated that I don't UNDERSTAND why my network times out billy <billy@is.invalid> - 2013-10-10 00:19 +0000
                Re: Frustrated that I don't UNDERSTAND why my network times out billy <billy@is.invalid> - 2013-10-10 00:33 +0000
      Re: Frustrated that I don't UNDERSTAND why my network times out billy <billy@is.invalid> - 2013-10-09 10:54 +0000
      Re: Frustrated that I don't UNDERSTAND why my network times out billy <billy@is.invalid> - 2013-10-09 11:09 +0000
        Re: Frustrated that I don't UNDERSTAND why my network times out "ps56k" <pschuman_no5pam_m3@interserv.com> - 2013-10-10 16:34 -0500
          Re: Frustrated that I don't UNDERSTAND why my network times out unruh <unruh@invalid.ca> - 2013-10-10 22:40 +0000
            Re: Frustrated that I don't UNDERSTAND why my network times out "ps56k" <pschuman_no5pam_m3@interserv.com> - 2013-10-10 18:27 -0500
              Re: Frustrated that I don't UNDERSTAND why my network times out Thad Floryan <thad@thadlabs.com> - 2013-10-10 16:49 -0700
                Re: Frustrated that I don't UNDERSTAND why my network times out billy <billy@is.invalid> - 2013-10-11 00:40 +0000
                Re: Frustrated that I don't UNDERSTAND why my network times out Thomas Keusch <fwd+usenet-spam2013q4-1381456101@spam2013q4.bsd-solutions-duesseldorf.de> - 2013-10-11 01:50 +0000
                Re: Frustrated that I don't UNDERSTAND why my network times out billy <billy@is.invalid> - 2013-10-11 03:24 +0000
                Re: Frustrated that I don't UNDERSTAND why my network times out dyrmak <dyrmak@orange.fr.invalid> - 2013-10-11 08:50 +0000
                Re: Frustrated that I don't UNDERSTAND why my network times out billy <billy@is.invalid> - 2013-10-11 14:26 +0000
                Re: Frustrated that I don't UNDERSTAND why my network times out unruh <unruh@invalid.ca> - 2013-10-11 16:03 +0000
                Re: Frustrated that I don't UNDERSTAND why my network times out billy <billy@is.invalid> - 2013-10-11 20:19 +0000
                Re: Frustrated that I don't UNDERSTAND why my network times out unruh <unruh@invalid.ca> - 2013-10-11 20:38 +0000
                Re: Frustrated that I don't UNDERSTAND why my network times out Tauno Voipio <tauno.voipio@notused.fi.invalid> - 2013-10-11 21:34 +0300
          Re: Frustrated that I don't UNDERSTAND why my network times out Chris Davies <chris-usenet@roaima.co.uk> - 2013-10-11 00:00 +0100
      Re: Frustrated that I don't UNDERSTAND why my network times out billy <billy@is.invalid> - 2013-10-09 11:18 +0000
        Re: Frustrated that I don't UNDERSTAND why my network times out Tauno Voipio <tauno.voipio@notused.fi.invalid> - 2013-10-09 15:16 +0300
          Re: Frustrated that I don't UNDERSTAND why my network times out billy <billy@is.invalid> - 2013-10-09 17:41 +0000
            Re: Frustrated that I don't UNDERSTAND why my network times out Chris Davies <chris-usenet@roaima.co.uk> - 2013-10-09 19:22 +0100
              Re: Frustrated that I don't UNDERSTAND why my network times out billy <billy@is.invalid> - 2013-10-09 21:18 +0000
            Re: Frustrated that I don't UNDERSTAND why my network times out Rick Jones <rick.jones2@hp.com> - 2013-10-09 20:44 +0000
              Re: Frustrated that I don't UNDERSTAND why my network times out unruh <unruh@invalid.ca> - 2013-10-09 21:46 +0000
                Re: Frustrated that I don't UNDERSTAND why my network times out billy <billy@is.invalid> - 2013-10-10 00:39 +0000
                Re: Frustrated that I don't UNDERSTAND why my network times out Rick Jones <rick.jones2@hp.com> - 2013-10-10 01:30 +0000
                Re: Frustrated that I don't UNDERSTAND why my network times out billy <billy@is.invalid> - 2013-10-10 01:32 +0000
                Re: Frustrated that I don't UNDERSTAND why my network times out "David W. Hodgins" <dwhodgins@nomail.afraid.org> - 2013-10-09 22:25 -0400
                Re: Frustrated that I don't UNDERSTAND why my network times out billy <billy@is.invalid> - 2013-10-10 03:48 +0000
                Re: Frustrated that I don't UNDERSTAND why my network times out unruh <unruh@invalid.ca> - 2013-10-10 05:10 +0000
                Re: Frustrated that I don't UNDERSTAND why my network times out ein <ein@no.spam> - 2013-10-10 13:24 +0200
                Re: Frustrated that I don't UNDERSTAND why my network times out Chris Davies <chris-usenet@roaima.co.uk> - 2013-10-10 10:31 +0100
                Re: Frustrated that I don't UNDERSTAND why my network times out unruh <unruh@invalid.ca> - 2013-10-10 17:37 +0000
                Re: Frustrated that I don't UNDERSTAND why my network times out Chris Davies <chris-usenet@roaima.co.uk> - 2013-10-11 00:01 +0100
                Re: Frustrated that I don't UNDERSTAND why my network times out billy <billy@is.invalid> - 2013-10-10 20:21 +0000
                Re: Frustrated that I don't UNDERSTAND why my network times out unruh <unruh@invalid.ca> - 2013-10-10 21:04 +0000
                Re: Frustrated that I don't UNDERSTAND why my network times out billy <billy@is.invalid> - 2013-10-11 01:18 +0000
                Re: Frustrated that I don't UNDERSTAND why my network times out Chris Davies <chris-usenet@roaima.co.uk> - 2013-10-11 00:03 +0100
                Re: Frustrated that I don't UNDERSTAND why my network times out billy <billy@is.invalid> - 2013-10-11 00:57 +0000
                Re: Frustrated that I don't UNDERSTAND why my network times out billy <billy@is.invalid> - 2013-10-11 01:07 +0000
                Re: Frustrated that I don't UNDERSTAND why my network times out Richard Kettlewell <rjk@greenend.org.uk> - 2013-10-11 08:56 +0100
                Re: Frustrated that I don't UNDERSTAND why my network times out billy <billy@is.invalid> - 2013-10-10 00:47 +0000
                Re: Frustrated that I don't UNDERSTAND why my network times out billy <billy@is.invalid> - 2013-10-10 00:58 +0000
                Re: Frustrated that I don't UNDERSTAND why my network times out Rick Jones <rick.jones2@hp.com> - 2013-10-10 01:24 +0000
        Re: Frustrated that I don't UNDERSTAND why my network times out Bit Twister <BitTwister@mouse-potato.com> - 2013-10-09 12:23 +0000
        Re: Frustrated that I don't UNDERSTAND why my network times out Chris Davies <chris-usenet@roaima.co.uk> - 2013-10-09 19:27 +0100
          Re: Frustrated that I don't UNDERSTAND why my network times out billy <billy@is.invalid> - 2013-10-09 21:21 +0000
            Re: Frustrated that I don't UNDERSTAND why my network times out unruh <unruh@invalid.ca> - 2013-10-09 21:47 +0000
    Re: Frustrated that I don't UNDERSTAND why my network times out billy <billy@is.invalid> - 2013-10-09 10:43 +0000
    Re: Frustrated that I don't UNDERSTAND why my network times out billy <billy@is.invalid> - 2013-10-09 10:51 +0000
      Re: Frustrated that I don't UNDERSTAND why my network times out nemesis <nemesis@home.it> - 2013-10-09 08:14 -0300
        Re: Frustrated that I don't UNDERSTAND why my network times out "p-0''0-h the cat (ES)" <super.pooh@furryfreeware.invalid> - 2013-10-09 12:24 +0100
          Re: Frustrated that I don't UNDERSTAND why my network times out nemesis <nemesis@home.it> - 2013-10-09 08:42 -0300
          Re: Frustrated that I don't UNDERSTAND why my network times out billy <billy@is.invalid> - 2013-10-09 13:57 +0000
            Re: Frustrated that I don't UNDERSTAND why my network times out "p-0''0-h the cat (ES)" <super.pooh@furryfreeware.invalid> - 2013-10-09 15:09 +0100
        Re: Frustrated that I don't UNDERSTAND why my network times out billy <billy@is.invalid> - 2013-10-09 11:27 +0000
          Re: Frustrated that I don't UNDERSTAND why my network times out nemesis <nemesis@home.it> - 2013-10-09 08:58 -0300
            Re: Frustrated that I don't UNDERSTAND why my network times out billy <billy@is.invalid> - 2013-10-09 18:44 +0000
              Re: Frustrated that I don't UNDERSTAND why my network times out unruh <unruh@invalid.ca> - 2013-10-09 19:58 +0000
                Re: Frustrated that I don't UNDERSTAND why my network times out billy <billy@is.invalid> - 2013-10-09 21:23 +0000
                Re: Frustrated that I don't UNDERSTAND why my network times out unruh <unruh@invalid.ca> - 2013-10-09 21:38 +0000
                Re: Frustrated that I don't UNDERSTAND why my network times out Mike Easter <MikeE@ster.invalid> - 2013-10-09 16:14 -0700
                Re: Frustrated that I don't UNDERSTAND why my network times out billy <billy@is.invalid> - 2013-10-10 00:30 +0000
                Re: Frustrated that I don't UNDERSTAND why my network times out Mike Easter <MikeE@ster.invalid> - 2013-10-09 18:02 -0700
                Re: Frustrated that I don't UNDERSTAND why my network times out Rick Jones <rick.jones2@hp.com> - 2013-10-10 01:37 +0000
                Re: Frustrated that I don't UNDERSTAND why my network times out unruh <unruh@invalid.ca> - 2013-10-10 03:17 +0000
                Re: Frustrated that I don't UNDERSTAND why my network times out billy <billy@is.invalid> - 2013-10-10 20:03 +0000
                Re: Frustrated that I don't UNDERSTAND why my network times out billy <billy@is.invalid> - 2013-10-10 20:06 +0000
                Re: Frustrated that I don't UNDERSTAND why my network times out billy <billy@is.invalid> - 2013-10-09 21:27 +0000
                Re: Frustrated that I don't UNDERSTAND why my network times out unruh <unruh@invalid.ca> - 2013-10-09 22:15 +0000
                Re: Frustrated that I don't UNDERSTAND why my network times out billy <billy@is.invalid> - 2013-10-10 00:35 +0000
                Re: Frustrated that I don't UNDERSTAND why my network times out "p-0''0-h the cat (ES)" <super.pooh@furryfreeware.invalid> - 2013-10-10 09:15 +0100
          Re: Frustrated that I don't UNDERSTAND why my network times out billy <billy@is.invalid> - 2013-10-11 01:40 +0000
            Re: Frustrated that I don't UNDERSTAND why my network times out nemesis <nemesis@home.it> - 2013-10-10 23:03 -0300
              Re: Frustrated that I don't UNDERSTAND why my network times out billy <billy@is.invalid> - 2013-10-11 14:43 +0000
                Re: Frustrated that I don't UNDERSTAND why my network times out ~BD~ <~BD~@nomail.afraid.org> - 2013-10-11 16:11 +0100
            Re: Frustrated that I don't UNDERSTAND why my network times out unruh <unruh@invalid.ca> - 2013-10-11 04:11 +0000
              Re: Frustrated that I don't UNDERSTAND why my network times out billy <billy@is.invalid> - 2013-10-11 04:19 +0000
                Re: Frustrated that I don't UNDERSTAND why my network times out billy <billy@is.invalid> - 2013-10-11 04:25 +0000
                Re: Frustrated that I don't UNDERSTAND why my network times out unruh <unruh@invalid.ca> - 2013-10-11 04:45 +0000
                Re: Frustrated that I don't UNDERSTAND why my network times out ein <ein@no.spam> - 2013-10-11 08:06 +0200
                Re: Frustrated that I don't UNDERSTAND why my network times out billy <billy@is.invalid> - 2013-10-11 14:32 +0000
                Re: Frustrated that I don't UNDERSTAND why my network times out billy <billy@is.invalid> - 2013-10-11 14:41 +0000
                Re: Frustrated that I don't UNDERSTAND why my network times out billy <billy@is.invalid> - 2013-10-11 14:48 +0000
                Re: Frustrated that I don't UNDERSTAND why my network times out Richard Kettlewell <rjk@greenend.org.uk> - 2013-10-11 09:00 +0100
                Re: Frustrated that I don't UNDERSTAND why my network times out billy <billy@is.invalid> - 2013-10-11 14:30 +0000
                Re: Frustrated that I don't UNDERSTAND why my network times out Rick Jones <rick.jones2@hp.com> - 2013-10-14 19:20 +0000
            Re: Frustrated that I don't UNDERSTAND why my network times out "p-0''0-h the cat (ES)" <super.pooh@furryfreeware.invalid> - 2013-10-11 10:17 +0100
              Re: Frustrated that I don't UNDERSTAND why my network times out billy <billy@is.invalid> - 2013-10-11 14:23 +0000
                Re: Frustrated that I don't UNDERSTAND why my network times out "p-0''0-h the cat (ES)" <super.pooh@furryfreeware.invalid> - 2013-10-11 22:46 +0100
            Re: Frustrated that I don't UNDERSTAND why my network times out Scott Hemphill <hemphill@hemphills.net> - 2013-10-14 16:47 -0400
      Re: Frustrated that I don't UNDERSTAND why my network times out unruh <unruh@invalid.ca> - 2013-10-09 16:17 +0000
  Re: Frustrated that I don't UNDERSTAND why my network times out "ps56k" <pschuman_no5pam_m3@interserv.com> - 2013-10-10 16:41 -0500
    Re: Frustrated that I don't UNDERSTAND why my network times out Mike Easter <MikeE@ster.invalid> - 2013-10-10 15:16 -0700
      Re: Frustrated that I don't UNDERSTAND why my network times out Mike Easter <MikeE@ster.invalid> - 2013-10-10 15:18 -0700
        Re: Frustrated that I don't UNDERSTAND why my network times out "ps56k" <pschuman_no5pam_m3@interserv.com> - 2013-10-13 14:34 -0500
          Re: Frustrated that I don't UNDERSTAND why my network times out Mike Easter <MikeE@ster.invalid> - 2013-10-13 14:27 -0700
            Re: Frustrated that I don't UNDERSTAND why my network times out "ps56k" <pschuman_no5pam_m3@interserv.com> - 2013-10-17 14:58 -0500
  Re: Frustrated that I don't UNDERSTAND why my network times out "petrus bitbyter" <petrus.bitbyter@hotmail.com> - 2013-10-11 22:17 +0200
  Re: Frustrated that I don't UNDERSTAND why my network times out "petrus bitbyter" <petrus.bitbyter@hotmail.com> - 2013-10-11 22:42 +0200
    Re: Frustrated that I don't UNDERSTAND why my network times out unruh <unruh@invalid.ca> - 2013-10-11 21:16 +0000
      Re: Frustrated that I don't UNDERSTAND why my network times out "David W. Hodgins" <dwhodgins@nomail.afraid.org> - 2013-10-11 18:15 -0400
      Re: Frustrated that I don't UNDERSTAND why my network times out "petrus bitbyter" <petrus.bitbyter@hotmail.com> - 2013-10-13 02:04 +0200

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