How to troubleshoot wide area network performance problem?

[Alex Hewitt]

On Fri, 2008-07-11 at 11:30 -0400, Hewitt_Tech wrote:
> 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.

Actually the site I'm going to replace the router at is the Bedford
site. I want to make sure I've done everything humanly possible to be
100% sure the problem isn't in equipment that I can control.

-Alex

> 
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