Slow Downloads with Buffalo WZR-450HP2D DD-WRT Router

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I've connected a Buffalo WZR-450HP2D router to my modem in bridge mode and it's hard-wired to my desktop PC. My speed with my ISP is 100 mb/s. My downloads are extremely slow, like downloading a 60 MB file in 30 minutes. Connected directly to the modem, it takes a second. Are there any settings I need to change to get this working? The weird thing is, speedtest.net shows I'm getting more than my speed level. I had another Buffalo DD-WRT router that gave me my full speed as soon as I plugged it in, so maybe this one is faulty? Please give me some ideas. Thank you.



Jim
 
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Windows 7 Professional x64Intel Core i7-4790 CPU @ 3.60GHz (Haswell)16 GBNVIDIA GeForce GTX 745 4GB DDR 3
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Dell XPS8700
OS
Windows 7 Professional x64
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Intel Core i7-4790 CPU @ 3.60GHz (Haswell)
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Did you try another port of the new router? Try chaining the old router between new one and PC? :)
 

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Custom Build
OS
Windows 7 Ultimate x64 SP1
CPU
AMD Phenom 2 1090T
Motherboard
Gigabyte GA-890FXA-UD5
Memory
2x8GB Kingston HyperX Fury Black 1600Mhz Unganged
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MSI GTX 970 Gaming 4G
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Realtek On-Board HD 7.1 Audio / Logitech G35
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3xAcer GD245HQ
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Samsung 850 Pro 512GB SSD - OS /
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Cooler Master HAF 932
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100/4 Mbit Cable (100GB quota)
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Logitech F710/ G27/ G940/ Z5500 // TrackIR 5 // Nvidia 3D Surround Vision
There's only one possible port that can be used for the ISP's modem to be connected to, and that is the first port (a blue port). I sent the old router back to Buffalo. I may order another one.
 

My Computer My Computer

At a glance

Windows 7 Professional x64Intel Core i7-4790 CPU @ 3.60GHz (Haswell)16 GBNVIDIA GeForce GTX 745 4GB DDR 3
Computer type
PC/Desktop
Computer Manufacturer/Model Number
Dell XPS8700
OS
Windows 7 Professional x64
CPU
Intel Core i7-4790 CPU @ 3.60GHz (Haswell)
Motherboard
Dell Lynx Point Z87 Chipset motherboard
Memory
16 GB
Graphics Card(s)
NVIDIA GeForce GTX 745 4GB DDR 3
Sound Card
NVIDIA High Definition Audio
Monitor(s) Displays
HP Pavilion 27bw 27"
Screen Resolution
1920 x 1080 @ 60 Hz
Hard Drives
Seagate ST2000DM001 2 TB
Internet Speed
150 mb/s
Antivirus
Microsoft Security Essentials
Browser
Google Chrome
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