This is a classic example of QoS usage.

The VPN connection doesn't experience the problem because the QoS 
settings for VPN would have a no throttling policy attached. SSH would 
typically be non-throttled as well.






On 02/17/2013 08:02 PM, Derek Trotter wrote:
> For several weeks I've had a problem with my earthlink dsl service.  
> Anytime I'm doing something that uses all or most of my downstream 
> bandwidth, all data coming into or going out of my apartment stops.  
> At the same time I'm downloading something a series of updates for 
> kubuntu and listening to streaming audio, both stop.  If I'm using my 
> windows box to download something else, that too stops.  After a pause 
> lasting anywhere from a second or two to 15 or 20 seconds, the 
> downloads resume.  A few seconds later, there's another pause.  This 
> cycle repeats itself until the download is complete or I give up.
>
> Each computer has two nics.  The problem persists no matter which one 
> either machine is using for it's internet connection. If I remove the 
> router, connect the dsl modem directly to either computer, the problem 
> persists.  I even went to the closet and got the modem when I had dsl 
> from AT&T.  I set it to work with the earthlink service and the 
> problem persists.
>
> Saturday an AT&T technician was here, checked the line from the cord 
> that plugs into the dsl modem and says the line is in excellent shape 
> and noise levels are very low.  This is not surprising since I live 
> less than 1/4 mile from AT&T's local office where all their equipment is.
>
> Since I've tried two computers, 4 nics, two dsl modems and removed the 
> router, and the problem still persists, I'm guessing the problem is 
> somewhere at earthlink's end.
>
> Tonight at 21:30 EST, an earthlink tech support person from somewhere 
> in India called to tell me they had fixed the problem.  While he was 
> on the phone I tried downloading something else and guess what.  The 
> problem was not fixed.  As near as I can tell, the dsl connection does 
> not go down.  The earthlink people say it stays up.  The lights on the 
> modem that are on when the connection is up never go off or blink.
>
> The man asks me what dns settings I use.  I tell him 8.8.8.8 and 
> 8.8.4.4.  He says I should try earthlink's dns servers.  To humor him 
> I changed the settings on the windows box and guess what.  The problem 
> did not go  away.
>
> Maybe I'm missing something, but it's my understanding that once the 
> download has begun, that dns has already done it's job and has no 
> further role to play.  One more thing.  If I use a VPN connection, I 
> have no problem with it.
>
> Any idea what's going on?  If you were to venture a guess, would you 
> say the problem is at my place, with AT&T or with Earthlink?
>
> Thanks
>
> Derek
> -- 
> "I get my copy of the daily paper, look at the obituaries page, and if I'm not there, I carry on as usual."
>
> Patrick Moore
>
>
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