How to troubleshoot wide area network performance problem?

[Hewitt_Tech]

Mark Greene wrote:
> 
> 
> On Thu, Jul 10, 2008 at 7:36 PM, Alex Hewitt <hewitt_tech at comcast.net 
> <mailto:hewitt_tech at comcast.net>> wrote:
> 
>     I have clients with an interesting network problem. One location in
>     Bedford New Hampshire using a fractionated T1 has routinely been
>     transmitting studies to an office in Nashua New Hampshire. There have
>     been no problems with this for at least 18 months. However recently
>     (about a week ago), the transmissions suddenly became slow, really slow.
>     A transmission that was taking around 10 minutes suddenly jumped to 2-3
>     hours. The customer in Bedford New Hampshire is using One
>     Communications. 
> 
> 
> I'd bet money that One Communications is the culprit, and that they are 
> doing different routing on their network to you vs. to your Nashua 
> client's office.  They *may* be doing selective throttling based on 
> content ala Comcast, but this may also be a non-malicious mistaken 
> config problem too.
> 
> mark
> 
> 
> 
> 
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I've had suggestions from at least two colleagues that we may be the 
victims of peer to peer throttling. I'm going back to the Nashua site 
later today and I'm going to replace a small internal router that used 
to replace a failed router Monday. I don't believe the internal router 
has any bearing on the problem because the customer noticed the problem 
when there was no internal router in place (we bypassed it as a 
workaround). I'm not sure if there is any kind of tool that can be used 
to check for throttling. One of my colleagues ran into a Comcast 
throttling problem while doing an rsync at a different location. He said 
the rsync ran at full speed for about 30 seconds and then basically 
dropped to about ten percent performance after that. I need to see if 
something similar is going on at the Bedford site.

-Alex

P.S. I'll probably put in a call to One Communications today to have 
them check the connection/routing.