Fast 225Mbps LAN, SLOW 10Mbps WAN
My wired download speeds are super fast, ranging between 190-260 Mbps (according to Google's Internet Speed Test). My wireless download speeds are a pitiful 3-17 Mbps (averaging about 10). I've been working on this all day, and I've tried many things. Please help!!
ISP: Xfinity/Comcast "Blast Pro Tier" with speeds up to 250Mbps
Modem: Arris JRSB6141
Router: Netgear Nighthawk r6400v2, about 18 months old
Router firmware: V188.8.131.52_10.0.50
Desktop OS: 64-bit Windows 10 Home (AMD A10-7700K Radeon R7 processor); wired Ethernet connection
Cell phone: Samsung Galaxy S7 SM-G930P Android version 8.0.0 (Oreo)
Laptop OS: 64-bit Windows 10 Home (Intel Core i7-4810MQ 2.80 GHz processor)
Laptop network adapter: Realtek RTL8723BE Wireless LAN 802.11n PCI-E NIC
Wifi extender (when used in the experiments below): Netgear AC1200 EX6120
I actually see the speed promised by Xfinity (190-260 Mbps download) on my wired desktop. So, the ISP, modem, router, ethernet (cat 5e) cable, computer, browser, and speet tester are all working perfectly when wired. But the WIFI download speeds rarely exceed 17 Mbps, and they usually come in around 10 Mbps. That makes me think there is something wrong with the router's wireless/wifi broadcasting.
What I've tried:
- I rebooted the router several times (including a "hard" reset), as well as the modem once, and my computers and devices numerous times.
- I factory reset the router and the extender and then installed firmware updates.
- I made sure the router and extender were both transmitting at 100% power.
- My home has a first floor and a basement. I moved the router from one side of the basement to the center of the basement near the ceiling.
- I disconnected all other devices from the wifi (this happened when I factory reset the router--I used the default SSID and password to connect only my device to the wifi).
- I downloaded a wifi analyzer and changed channels from 2 (which was pretty congested) to 6, 11, then 5, and then back to 11.
- I tried connecting only one device on the 2.4 GHz frequency and then only one device on the 5 GHz frequency.
- I set up QoS to give high priority to my devices.
- I downgraded the firmware to try 3 or 4 different prior versions.
- I renewed my device's ip address.
- I brought my wifi devices into the same room as the router, just 4-5 feet away with an unobstructed signal.
With every single thing I tried, I regularly got WIFI download speeds of just 3-17Mbps, with an average of about 10Mbps. Perhaps 2-3 times all day, the Laptop wifi download speed jumped to about 50 Mbps for one second for a single speed test. A moment later, when I tried the speed test again to verify that result, it would drop to 17 Mbps or below. 50 would be perfect for my laptop (which should not be able to go much faster with an 802.11n network card and cannot connect to 5 GHz). But my phone (which connects to 5 GHz just fine) never shows a higher speed than 17 Mbps, and regularly shows just 3-8 Mbps. Out of 250!
Also, when I change my wifi range extender to FastLane mode, selecting the 2.4 GHz frequency from the router and broadcasting the 5 GHz frequency to my devices, the extender shows me a list of available wifi networks to extend, but my Nighthawk's deafault wifi network (Netgear03) doesn't show up in the list 2/3 of the time! And then when it does show up and I select it, the FastLane doesn't work. It boots me from the setup screen and says the site can't be reached; and when I log back in, Fast Lane isn't working, and the extender again has a hard time finding the SSID.
Why doesn't my Nighthawk router output a consistent WIFI signal of more than 17 Mbps?