Cogent NOC

Wed Dec 14 19:59:53 UTC 2016

If the loss is seen towards a terminating webserver maybe spool curl response times over the course of a day and correlated that to observed loss via a smokeping service.

Support may be more responsive with some hard statistics.

Regards,
Andrew Paolucci

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-------- Original Message --------
Subject: Re: Cogent NOC
Local Time: December 14, 2016 2:53 PM
UTC Time: December 14, 2016 7:53 PM
From: listas at kurtkraut.net
To: amps at djlab.com
Nanog <nanog at nanog.org>

Hello,

mtr packet loss column has no scientific precision and should not be
considered. It is not mtr fault but forwarding routers have a low priority
to respond to ICMP requests. The only way you can prove there is a problem
is a end to end ping, the regular ping command, not mtr.

Best regards,

Kurt Kraut

2016-12-14 17:16 GMT-02:00 Randy <amps at djlab.com>:

> Hi all,
>
> Anyone beyond front line support at cogento on list?
>
> Nanog is the last place I'd look for assistance but it seems support over
> at cogentco is not nearly what it used to be.
>
> Example MTR to cogen't own website (support doesn't utilize or understand
> MTR at all apparently):
>
> Host Loss% Snt Last Avg Best Wrst
> StDev
> 1. x.x.x.x 0.0% 196 0.5 11.7 0.3
> 186.8 35.2
> 2. x.x.x.x 0.0% 196 0.6 10.2 0.4
> 226.3 36.2
> 3. 38.88.249.209 0.0% 196 0.9 1.1 0.7
> 17.7 1.2
> 4. te0-0-2-3.nr13.b023801-0.iad01.atl 0.0% 196 1.0 1.0 0.8
> 2.0 0.1
> 5. te0-0-0-1.rcr22.iad01.atlas.cogent 2.0% 196 2.1 1.9 1.0
> 3.3 0.4
> 6. be2961.ccr41.iad02.atlas.cogentco. 2.6% 196 1.8 2.1 1.1
> 3.8 0.5
> 7. be2954.rcr21.iad03.atlas.cogentco. 2.6% 196 2.0 2.3 1.2
> 9.4 0.7
> 8. be2952.agr11.iad03.atlas.cogentco. 0.5% 196 2.7 2.6 1.5
> 6.8 0.6
> 9. cogentco.com 4.1% 196 2.1 2.0 1.0
> 16.8 1.1
>
> Pretty much the same to anywhere. Packet loss begins at rcr22.iad01 and
> propagates all the way down the line. Worse during peak hours, gone late
> at night.
>
> After three days of no email response for my ticket, I called and after an
> hour of my life I want back, front line support cannot reproduce the loss.
> Final conclusion: "Your host is dropping packets".
>
> --
> ~Randy
>