Comcast Enterprise Fiber Slow Connection Problem from TW Telecom

Fri Oct 31 19:02:34 UTC 2014

On 31 October 2014 18:32, Zachary Frederick <zcfrederick at gmail.com> wrote:

> We have been having a problem receiving software releases from our
> developer. The releases are typically around 1G in size. The developer’s
> connection is a 100m metro fiber with TW Telecom,  our connection is a 25m
> Comcast Enterprise Fiber.
>
> Our traffic graphs show very little utilization of our connection.
> Typically on average we are at about 7 meg utilization of our 25.
>
> Every other partner that shares in our software development that receives
> the software releases can receive the updates 3-4 times faster than we can.
>
> Typically we receive the releases at about 3mbps.
>

Are you using an application that uses TCP transport for the transfer?

https://www.switch.ch/network/tools/tcp_throughput/index.html?mss=1460&rtt=38&loss=1e-06&Calculate=Calculate&bw=100&rtt2=80&win=64

3Mbps looks about right. Time for a tune up

> I have tried contacting Comcast Enterprise Tech support, however I’ve been
> told that if I run a speed test from my connection and the test runs at the
> speed we are paying for, there is very little they are willing to look into.
>
> Can anyone check on the Comcast Routers on the Tracert below, or is there
> anything that can be throttling this connection between the two connections?
>
> Also, our firewall and connection is able to run at the full 25. We have
> no throttling or QOS set to prevent a good connection to our developer. For
> example, we can run a multi-threaded upload, in the middle of the night, to
> Amazon Glacier storage and completely saturate our connection when doing
> so. The firewall and connection is able to handle our full bandwidth
> capacity during that backup.
>
> If there is any other information I can provide to help track this problem
> down, please let me know.
>
> Thanks in advance, everyone!
>
>
> Trace Route below:
>
>
>
>
> 1  (172.16.150.1)  1.143 ms  1.132 ms  1.122 ms
>
>
> 2  (173.227.204.1)  1.585 ms  1.583 ms  1.574 ms
>
>
> 3  chi2-pr1-xe-0-3-0-0.us.twtelecom.net (66.192.245.166)  10.477 ms
> 10.485 ms 10.478 ms
>
>
> 4  x-eth-0-0-4-pe05.350ecermak.il.ibone.comcast.net (75.149.230.141)
> 10.470 ms 10.465 ms  10.457 ms
>
>
> 5  he-2-1-0-0-cr01.350ecermak.il.ibone.comcast.net (68.86.86.37)  10.733
> ms  10.731 ms he-2-0-0-0-cr01.350ecermak.il.ibone.comcast.net
> (68.86.86.33)  12.146 ms
>
>
> 6  be-10206-cr01.newyork.ny.ibone.comcast.net (68.86.86.225)  33.202 ms
> 32.144 ms  32.127 ms
>
>
> 7  68.86.91.30 (68.86.91.30)  41.508 ms  41.322 ms  41.599 ms
>
>
> 8  te-0-0-0-1-sur01.greensburg.pa.pitt.comcast.net (69.139.168.26)
> 38.196 ms te-0-0-0-3-sur01.greensburg.pa.pitt.comcast.net
> (162.151.21.82)  44.644 ms te-0-0-0-0-sur01.greensburg.pa.pitt.comcast.net
> (69.139.195.18)  38.266 ms
>
>
> 9  (107.1.72.98)  39.781 ms  39.785 ms  39.912 ms