Cogent NOC

Kurt Kraut listas at kurtkraut.net
Wed Dec 14 19:53:56 UTC 2016


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
>


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