packet loss out of Texas on Cogent and GlobalCrossing

Tue Nov 15 00:09:30 UTC 2011

I take multiple services from Global Crossing in San Jose and have had
reports of packet loss from Cogent users in Chicago and London (and been
able to reproduce).

In all cases it appears to be after wherever Cogents' "mci01" location is.

 10.|-- te0-3-0-3.mpd21.mci01.atl  0.0%   100  205.7 205.2 204.5 207.7   0.7

 11.|-- te0-5-0-4.mpd21.ord01.atl  7.0%   100  238.4 235.6 230.4 239.1   2.0

 12.|-- te0-0-0-5.ccr21.bos01.atl  4.0%   100  315.1 315.0 314.6 316.7   0.3

 13.|-- te0-0-0-2.mpd21.lon13.atl 10.0%   100  323.7 323.7 321.6 325.7   0.7

 14.|-- te2-1.ccr01.lon01.atlas.c  6.0%   100  324.6 332.8 314.9 523.0  38.5

 15.|-- te1-2.mpd01.lon01.atlas.c  9.0%   100  326.3 339.3 324.9 506.0  39.5

10.|-- te0-4-0-3.mpd21.mci01.atl  0.0%   100  206.1 208.9 204.6 225.8   5.3

 11.|-- te0-4-0-3.mpd21.ord01.atl  3.0%   100  239.2 237.0 228.7 239.5   1.9

 12.|-- te0-0-0-1.ccr21.ord03.atl  4.0%   100  239.1 237.4 228.3 240.9   2.0

 13.|-- te2-1.mpd02.ord03.atlas.c  4.0%   100  228.0 235.2 227.0 350.2  23.9

McDonald

On Tue, Nov 15, 2011 at 7:52 AM, Charles Gagnon <charlesg at unixrealm.com>wrote:

> Good point, I can't seem to reproduce with the looking glass
> interfaces out there. They either don't use enough packets in sequence
> or don't through the problem hops. On this path:
>
> Send ICMP echos to 24.227.216.194, timeout is 2 seconds,  maximum hops
> are 32,1       0ms     1ms     0ms     74.201.153.2212       143ms
> 10ms    0ms     216.52.95.893       1ms     1ms     1ms
> 77.67.70.974       1ms     1ms     1ms     213.200.66.2105       3ms
>   1ms     2ms     66.198.111.976       19ms    7ms     7ms
> 216.6.87.97       7ms     7ms     7ms     216.6.87.28       6ms
> 7ms     7ms     66.198.154.149       6ms     7ms     6ms
> 107.14.19.13210      107ms   108ms   113ms   66.109.10.1111      118ms
>   144ms   120ms   107.14.17.13912      119ms   120ms   120ms
> 72.179.205.5913      115ms   115ms   114ms   24.73.240.19514
> 115ms   115ms   115ms   24.73.240.252
> I re-tested and using 100 msg counts, I get 3-6% packet loss on
> anything after 10. On hops 1-10, I'm all clean. That 66.109.10.11
> address is inside TimeWarner/RR so I'll keep trying to contact them.
>
>
> On Mon, Nov 14, 2011 at 2:23 PM, Eric Tykwinski <eric-list at truenet.com>
> wrote:
> > Have you check the relevant looking glass sites?
> >
> > http://www.cogentco.com/en/network/looking-glass
> > http://www.globalcrossing.com/network/network_looking_glass.aspx
> >
> > We are connected to both providers, so everything is looking clean for
> us.
> >
> > Sincerely,
> >
> > Eric Tykwinski
> > TrueNet, Inc.
> > P: 610-429-8300
> > F: 610-429-3222
> >
> > -----Original Message-----
> > From: Charles Gagnon [mailto:charlesg at unixrealm.com]
> > Sent: Monday, November 14, 2011 2:11 PM
> > To: nanog at nanog.org
> > Subject: packet loss out of Texas on Cogent and GlobalCrossing
> >
> > I need the Nanog intellect,
> >
> > We are seeing packet loss in certain scenarios only on traffic to and
> from
> > Austin, TX. The local provider is Time Warner and they are not having
> > (obvious) problems. We ran tests from NY and NJ over Internap and
> AboveNet
> > connections.We only see problems when the traffic goes over gblx or
> cogent.
> > Has anyone heard of problem with these carriers out of Texas?
> > --
> > Charles Gagnon
> > charlesg at unixrealm.com
> >
> >
> >
>
>
>
> --
> Charles Gagnon
> charlesg at unixrealm.com
>
>