Slow Internet Connection when Router Connected

I've got a small network of 7 computers with the following components:

Cable Modem:  Motorola Surfboard SB4200 (less than 3 months old)
D-Link Router (w/ wireless activated): DIR655
Netgear Prosafe 24 Port 10/100 Smart Switch FS726T

When I connect any of the computers (all running XP or Windows 7) directly to the Cable Modem, I can get a 10mb connection.

When I connect the Cable Modem to the Router (internet port), and then connect the router to the switch, and the computers to the switch, the speed is cut to 2mb.

I'm using www.speedtest.net to test speed.

I've tried another switch which is known to be good and got the same problem.  I've tried restarting the router (but non resetting it because the settings are a little complicated).  I've also tried resetting the switch and restarting the modem.  I also know that we were getting 10mb connections on all comoputers with the exact same router and switch some time ago (probably 6 months ago).  I've also called the ISP but because the speed of the modem connected directly to any computer is good, they say the problem must be something other than their service (which seems logical).

Is the router the likely suspect?  Unfortunately, I don't have another router to test that.  Any suggestions would be greatly appreciated!

thanks,
darin
DarinOBrienAsked:
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rochey2009Connect With a Mentor Commented:
Hi,

Try turning off the traffic shaper.
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PapertripCommented:
Another test router sure would be nice ;)

It looks like the only thing you didn't try, or mention at least, is modem -> router -> computer.  
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Aaron TomoskySD-WAN SimplifiedCommented:
2 mbit both ways or just upload? Is qos turned on?
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DarinOBrienAuthor Commented:
Sorry, I forgot to say that I tried modem -> router -> computer and got same problem.  

2mb is download (upload is about .2mb).  Supposed to be 10mb download/1mb upload per ISP.  

thanks,
darin
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Aaron TomoskySD-WAN SimplifiedCommented:
How are your ping times? Ping 8.8.8.8
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PapertripCommented:
Sorry, I forgot to say that I tried modem -> router -> computer and got same problem.  
If you know that the other switch you tried is good, and taking into consideration all your other test results, then the problem appears to be the router.  Can you borrow a friends?  Go buy one to test with and return it if the problem still exists?  Good thing about that suggestion is you already have your new router if it does fix the problem ;)
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10023Web site maintenance and designCommented:
I was waiting for an answer from papertrip ?...but I would check if the switch is running half duplex or full...which according to its documentation should be the default but only if it is talking to an adaptor that is set for auto negotiation...note the adapter setting in properties...
Another thought would be a flakey uplink cable between the switch and the router??


your documentation:
Auto Negotiation
The RJ-45 ports negotiate the correct duplex mode and speed if the device at the other end of the link supports auto negotiation. If the device does not support auto negotiation, the switch only determines the speed correctly and the duplex mode defaults to half-duplex.
The gigabit port on the Gigabit module negotiates speed, duplex mode, and flow control, provided that the attached device supports auto-negotiation.
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PapertripCommented:
@10023 that is what I was thinking could be potential sources of the problem, but then Darin said the problem exists with modem+router+computer.
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Aaron TomoskySD-WAN SimplifiedCommented:
What if you turn off wifi on the router? I've seen interference from other wireless networks on the same or close channels take out consumer routers
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inbox788Commented:
The router is basically defective. You could try to turn off firewall/SPI and see if that helps. You can also try updating the firmware. What version do you have? If you have a rev. A1 or B1, you might be able to contact D-link and get an A3 version, but the least painful solution is just to get another router.

http://www.dd-wrt.com/wiki/index.php/Known_incompatible_devices


http://www.dslreports.com/forum/r23157768-DIR-655-Rev-B-available-in-stores-yet-
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DarinOBrienAuthor Commented:
Here's what I did:

1.  I  borrowed a router and had that DID solve the problem.  However, I wasn't convinced that the modem was defective so I plugged in the old one.
2.  Next I tested ping 8.8.8.8 and got 27ms...not sure what that told me :-)?
3.  Checked for firmware update in through the router interface.  It is currently 1.21 and when I checked for update, it said "this is the latest version".
4.  I also turned off wireless.  That did not solve the problem.
5.  I next turned off "enable traffic shaping".  THAT SOLVED THE PROBLEM.

HOWEVER, I can't find where to check the duplex mode so that's something I couldn't change/check.  Can someone tell me how to find that setting on this router?

Also, what is "traffic shaping" and do I care if it's enabled or not?  Assuming that turning off traffic shaper isn't a problem or an indication of some other problem with the router, I'll award points to rochey2009.

Thanks for the help!
darin



However, then I try to see if it was a  
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Aaron TomoskyConnect With a Mentor SD-WAN SimplifiedCommented:
Traffic shaping, qos, bandwidth management, are all thing that can help you get more spee out of a connection if setup correctly. They are also the main culprit of slow connections when not setup correctly. In low end consumer wifi router gear, it's usually best to just leave it off.
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DarinOBrienAuthor Commented:
Thanks to everyone who contributed...much appreciated!
darin
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