Comcast throttling?

Fri Oct 31 19:55:13 UTC 2014

Replying off-list as requested.

John

On Fri, Oct 31, 2014 at 1:41 PM, Mark Price <mprice at tqhosting.com> wrote:

> Similar to another thread on the list today, I'm troubleshooting a problem
> for a customer on Comcast business fiber.
>
> Downloading a file from one of our web servers is very slow (~15KByte/sec).
>  mtr looks clean in both directions.  I added an IP address on the same
> server from a different class C on our network, and downloads form this new
> IP are fast (2MByte/sec).
>
> Tracerouting from server to client is the same using both source IPs.  But,
> one IP consistently has the very slow speeds that the other does not.
> Changing our outbound path between different upstreams does not make a
> difference.
>
> It certainly feels like Comcast is throttling one of our IP ranges.  Could
> someone at Comcast please contact me off-list for details?
>
>
> Thanks,
>
> Mark
>