Router speed much slower than modem speed Wired

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spencercnorton

spencercnorton

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Sep 16, 2017
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0
510
Hello all!

STATS:

WIFI Router: Netgear R8000 (DD-WRT)
Modem: Arris TG3482G
ISP: Xfinity (Comcast)
Internet Package: 1000mbps D / 35 U
Internet Cables: CAT 6
Speed Test Website: Speedtest.net
Laptop used for testing: MSI GE72VR
connection type: wired
Router Processor Load when running tests: 6%
DD-WRT settings: Default
- QOS: OFF



I am having trouble fixing a bandwidth issue in my home network. My laptop posts download speeds of 945 MBPS when connected directly to the modem , which is fantastic, but I would prefer to use my own router (better range, connectivity, hopefully speed, advanced settings).

unfortunately when I run a test through the router (wired) my speed is will never go above roughly 384 MBPS. I'm using the same cable, and I'm having a hard time trouble shooting.

In other posts, it seems the router is usually to blame.

- are there specific settings within DD-WRT that I may need to adjust in order to achieve a higher speed?
- Is the answer simply that this router can not handle these speeds?
- If so, is there any router than can deliver these speeds through a wired connection?
- Any other Ideas?


Thank you so much for your input and assistance.


 
Solution
B
Your problem maybe that you are running dd-wrt. Most of the latest routers have a hardware assist feature that lets the traffic bypass the cpu. It is sometimes called nat acceleration. The chipset vendor has not released the code that you need to do this so you must use the CPU with third party firmware

I found this when I was going between asus-merlin (which does have the hardware assist) and dd-wrt on my router. There was a massive difference in the speed.

Still even with the hardware acceleration you must give up many nice feature like traffic filtering and qos. Even the screen that shows router utilization is wrong because the traffic is bypassing.

I would try to load a factory image and see if it runs faster.
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Ralston18

Ralston18

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Moderator
Oct 11, 2014
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You used the same cable but there are now two cables when the router is added:

IPS ------> Modem ------Ethernet Cat6 cable -----> laptop = 945 mbps.

IPS ------> Modem ------Ethernet Cat6 cable -----> router ------Ethernet cable Cat6 -------> laptop = 384 mbps.

Try another known working (i.e., "945 mbps") Ethernet Cat6 cable as the second cable.

Check that you are using the correct WAN and LAN ports - and verify any applicable configuration settings.

Did you turn off DHCP on the modem when the router was added and the router configured to provide DHCP IP addressing?








 
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spencercnorton

spencercnorton

Prominent
Sep 16, 2017
3
0
510
Thank you for your assistance,

I should have added:

- Both CAT 6 cables have been verified to transmit the full 945MBPS

The modem will not allow me to turn off DHCP as a specific setting, However The modem has a setting called "BRIDGE MODE" when this is activated, the device turns off all router functionality and only functions as a modem. when this is activated, the internet cannot be accessed without a router, and speed increases by approximately 30MBPS. this speed increase is observed from the router with the same setup as previously mentioned. DHCP is configured as a server on the router and is enabled.
 
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bill001g

Titan
Aug 9, 2012
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Your problem maybe that you are running dd-wrt. Most of the latest routers have a hardware assist feature that lets the traffic bypass the cpu. It is sometimes called nat acceleration. The chipset vendor has not released the code that you need to do this so you must use the CPU with third party firmware

I found this when I was going between asus-merlin (which does have the hardware assist) and dd-wrt on my router. There was a massive difference in the speed.

Still even with the hardware acceleration you must give up many nice feature like traffic filtering and qos. Even the screen that shows router utilization is wrong because the traffic is bypassing.

I would try to load a factory image and see if it runs faster.
 
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Solution
spencercnorton

spencercnorton

Prominent
Sep 16, 2017
3
0
510
I flashed the stock firmware,

- Download speeds are consistently 900+ MBPS
- I completed multiple factory resets with DD-WRT and experienced no change in performance

I never would have guessed DD-WRT was the problem. as much as I loved using it, 2/3's of my bandwidth and an additional 600+ MBPS is better.

That has fixed the problem.

THANK YOU!!!
 
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B

bobert2

Sep 4, 2020
1
0
10
bill001g said:
Your problem maybe that you are running dd-wrt. Most of the latest routers have a hardware assist feature that lets the traffic bypass the cpu. It is sometimes called nat acceleration. The chipset vendor has not released the code that you need to do this so you must use the CPU with third party firmware

I found this when I was going between asus-merlin (which does have the hardware assist) and dd-wrt on my router. There was a massive difference in the speed.

Still even with the hardware acceleration you must give up many nice feature like traffic filtering and qos. Even the screen that shows router utilization is wrong because the traffic is bypassing.

I would try to load a factory image and see if it runs faster.
Click to expand...



UPDATE- September 4, 2020
I had this same problem with a TP-LINK 1750. Nothing helped until I tried this NAT ACCELERATION topic. I changed all my options except for PASSTHROUGH items in NAT FOWARDING, and it worked. Now getting results similar to direct connected to modem.

Thanks you for your posts (and thanks to Bill001g). This one really helped me.
 
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