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Slow download speed when using router but fast with modem

Tags:
  • Networking
  • Cable
  • Routers
  • Computers
  • Wireless
  • Connection
  • wired
  • Internet
  • Download
  • Modem
  • Speed
Last response: in Networking
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October 12, 2014 10:55:41 AM

So basically as the title says, whenever I connect my computer (with cable) to the router, it slows my download speed down, by insane amounts. I get 10mbps download when using the router, but when I plug it in to the modem, I get 90 - 100 mbps, so I thought the router was the problem, therefore I tried changing router, however, still the same, I then tried with a third router, the same issue is there..

I tried to verify if my computer was the issue, by plugging the cable in to another laptop, but, the speed remains, so, it shouldn't be my computer, not really the router either, but not the modem either, because the modem gives the speed it should, the router sends out wirelessly the speed it should, and the cable can easily give the speed that it gets, since I get the speed required when connecting to the modem, just not from any other routers, so... I'm a little lost here?

Any ideas as to what may be causing this? Since two computers are getting the reduced speed when using three different routers.

Another odd thing is, I tried with another cable, that I'd plug into the laptop next to the router, and from there it gets the speed required, but that cable is way too short, I did actually get full speed from the long cable (from my computer and to the router) but that was when the cable was laying flat down next to the router.. So, is it possible the cable is damaged? But if so, why would it get full speed from the modem, but not the router?

More about : slow download speed router fast modem

Best solution

October 12, 2014 12:28:03 PM

Cable is the most likely problem. Is this a store bought cable or one you made? Is it a cat5 (or better) cable? You should start with a brand store bought new 2 to 3 meter cable and check your speeds. If you need a longer run then get the appropriate length cable. But you will have the short one for testing and other uses.
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October 14, 2014 3:03:52 AM

kanewolf said:
Cable is the most likely problem. Is this a store bought cable or one you made? Is it a cat5 (or better) cable? You should start with a brand store bought new 2 to 3 meter cable and check your speeds. If you need a longer run then get the appropriate length cable. But you will have the short one for testing and other uses.


Yeah I took your advice, so I went to buy a new cable, since the one I was using was just an old one I found laying around, and apparently that was the solution, so thank you! :) 

But still curious, why did I get full speed when I was using the cable on the modem, but not on the router?
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October 14, 2014 3:53:17 AM

Did you try an put your router's in the DMZ zone of the modem? To test an open connection run a web server an connect to your computer from a mobile phone or a friend, if you succeed an the problem you have still exist then I guess it's out of my league, but I tried to help
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October 14, 2014 3:55:15 AM

Make sure your modem's duplux modes are at there highest, Duplex chooses how many wires it will use to transmit data in 0/1. To make things easy use the reset button on the back. Duplex it used to put breaks on networks to avoid network collisions!
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October 14, 2014 4:21:48 AM

Trollulz said:
kanewolf said:
Cable is the most likely problem. Is this a store bought cable or one you made? Is it a cat5 (or better) cable? You should start with a brand store bought new 2 to 3 meter cable and check your speeds. If you need a longer run then get the appropriate length cable. But you will have the short one for testing and other uses.


Yeah I took your advice, so I went to buy a new cable, since the one I was using was just an old one I found laying around, and apparently that was the solution, so thank you! :) 

But still curious, why did I get full speed when I was using the cable on the modem, but not on the router?


Some network hardware is more sensitive to a bad cable. When in doubt, ALWAYS try a factory new cable.
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