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New routers killing internet speed

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  • Routers
  • Networking
  • Speed
  • Internet
Last response: in Networking
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October 16, 2014 2:42:23 PM

I have Mediacom cable internet and typically get 50-65mbps download speed. I have a Motorola SB6121 router (newest firmware installed per ISP) and a TP-Link TL-WR841ND router (currently has DD-WRT on it; had same speeds with stock firmware).

This week I tried replacing the TP-Link with a new Netgear R6250 and a D-Link DIR-868L router. Both of those new routers cut my download speed to 1.5-5mbps, either wired or wireless, tested on several occasions from different devices. Internal network speeds were gigabit fast. I even put the TP-Link in between the new router and the modem, making the new router a switch, and it goes full speed. There seems to be an issue with these newer routers being the main router in the network.

I've talked to Mediacom and Motorola support, they both say everything is fine on their end and that it must be the router. Netgear support had me try power cycling, changing settings, etc, and it never improved my speeds. I didn't bother with D-Link as I didn't really like the router anyways so if this issue can get resolved, I'll go back to the Netgear one.

Does anyone have an idea why this would happen? The SB6121 and R6250 have even been sold together as a set, so I know they should work together fine. I really want the USB 3.0 port to share an external HDD as well as gigabit ethernet. The WiFi upgrade was just for future-proofing as I will be using this router for several years hopefully. Thanks for any help!

More about : routers killing internet speed

October 16, 2014 2:48:11 PM

Is this a residential set up? If so, why multiple routers?

I can visualize multiple config errors with this, such as "I even put the TP-Link in between the new router and the modem, making the new router a switch, and it goes full speed."


ISP -> modem -> router -> switch -> devices.
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October 16, 2014 7:41:06 PM

USAFRet said:
Is this a residential set up? If so, why multiple routers?

I can visualize multiple config errors with this, such as "I even put the TP-Link in between the new router and the modem, making the new router a switch, and it goes full speed."


ISP -> modem -> router -> switch -> devices.


Yes it is residential. I am not using multiple routers, I was only inserting the old router into the network to test to see if the ethernet ports on the new router were bad or something similar. The normal setup would just be the SB6121 modem + a new router. The router has multiple LAN ports so I don't use a switch.

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