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Orbi rbr750 wifi speed test slows down

chris8a
Aspirant

Orbi rbr750 wifi speed test slows down

Hey all, I have a RBR750 Orbi WiFi 6 Router AX4200 that has a slow wifi connection for videos.
The google speed test on the router LAN connection (ethernet) shows 100/38 Mbs (great) - It is connected to a telstra fibre internet connection.
If I connect to the wifi, the speed test download starts at 80Mbs (good) then drops down to 3Mbs (bad) after 15 seconds.
I have reset the modem, updated the firmware,  and still no  improvement. It used to work fine. Any suggestions?

 

Message 1 of 7
FURRYe38
Guru

Re: Orbi rbr750 wifi speed test slows down

What Firmware version is currently loaded?
What is the Mfr and model# of the Internet Service Providers modem/ONT the NG router is connected too?

 

How are you speed testing? Orbi app or wired PC and web browser?

 

What devices are you speed testing with? 

 

My Setup ISP SparkLight | Internet Cable 1000↓/50↑ CM2000 Modem | Wifi Router RAXE50 and R8500(v.158) Router Mode | Switches NG GS105/8 | 

Additional NG HW: C7800/CAX80/CM1100/CM1200/CM2000, Orbi: CBK40, CBK752, RBK50, RBK853, RBK752, RBK953, SXK30 | NightHawk: R7000, R7800, R7960P, R8000, R8500, RAXE500, RAX50, XR450, EX7500/EX7700, GS308v3

Message 2 of 7
chris8a
Aspirant

Re: Orbi rbr750 wifi speed test slows down

Firmware version: V4.6.3.7_2.0.49

 

Modem is Telstra technicolor TG799vac. When connecting my new Dell Laptop XPS-15 to the LAN port on this modem the speed test works well at 106/28.2 Mbs and the download speed does not slow down while testing.

 

Speed test with this website is:
- Go to Google.com.
- Search for internet speed test.
- Tap or click Run Speed Test.
 (Google partners with Measurement Lab (M-Lab) to run this test.)

 

Orbi speed test was done over wifi using the same XPS-15  with LAN cable unplugged.
download starts at 80Mbs (good) then drops down to 3Mbs (bad) over approx 10-15 seconds

Message 3 of 7
FURRYe38
Guru

Re: Orbi rbr750 wifi speed test slows down

Your ISP Modem already has a built in router and wifi. This would be a double NAT (two router) condition which isn't recommended. https://kb.netgear.com/30186/What-is-Double-NAT
https://kb.netgear.com/30187/How-to-fix-issues-with-Double-NAT
Couple of options,
1. Configure the modem for transparent bridge or modem only mode. Then use the Orbi router in router mode. You'll need to contact the ISP for help and information in regards to the modem being bridged correctly.
2. If you can't bridge the modem, disable ALL wifi radios on the modem, configure the modems DMZ/ExposedHost or IP Pass-Through for the IP address the Orbi router gets from the modem. Then you can use the Orbi router in Router mode.
3. Or disable all wifi radios on the modem and connect the Orbi router to the modem, configure AP mode on the Orbi router. https://kb.netgear.com/31218/How-do-I-configure-my-Orbi-router-to-act-as-an-access-point and https://www.youtube.com/watch?v=H7LOcJ8GdDo&app=desktop

My Setup ISP SparkLight | Internet Cable 1000↓/50↑ CM2000 Modem | Wifi Router RAXE50 and R8500(v.158) Router Mode | Switches NG GS105/8 | 

Additional NG HW: C7800/CAX80/CM1100/CM1200/CM2000, Orbi: CBK40, CBK752, RBK50, RBK853, RBK752, RBK953, SXK30 | NightHawk: R7000, R7800, R7960P, R8000, R8500, RAXE500, RAX50, XR450, EX7500/EX7700, GS308v3

Message 4 of 7
chris8a
Aspirant

Re: Orbi rbr750 wifi speed test slows down

Thanks for the suggestions Furrye38.  I applied your point #2.

 

Still no improvement.

Strange thing is that it used to work just fine untill a few months ago i.e. it has always had the double Nat, and it made no difference to the speed. Something else has changed, but i'm not sure what....

The download speed starts off fine (80Mbs), then slows down to 4Mbs over a few seconds. So videos are a pain to watch, they stop & start.

 

 

Message 5 of 7
FURRYe38
Guru

Re: Orbi rbr750 wifi speed test slows down

Try the Orbi in AP mode with option #3...

My Setup ISP SparkLight | Internet Cable 1000↓/50↑ CM2000 Modem | Wifi Router RAXE50 and R8500(v.158) Router Mode | Switches NG GS105/8 | 

Additional NG HW: C7800/CAX80/CM1100/CM1200/CM2000, Orbi: CBK40, CBK752, RBK50, RBK853, RBK752, RBK953, SXK30 | NightHawk: R7000, R7800, R7960P, R8000, R8500, RAXE500, RAX50, XR450, EX7500/EX7700, GS308v3

Message 6 of 7
FURRYe38
Guru

Re: Orbi rbr750 wifi speed test slows down

ALL USERS of the 7 series Orbi AX system, please contact NG support by opening a support ticket and contact NG and ask them for the beta that seems to be avialable for the 7 series that seems to be directed to fixed what everyone with a 7 series has been having problems with:

https://www.netgear.com/support/#

For user out of warranty, contact @Blanca_O and @DarrenM and send them a PM and ask for the beta. 

 

https://community.netgear.com/t5/Orbi-AX/New-RBK752-753-Firmware-Version-4-6-3-7-Released/m-p/213650...

https://community.netgear.com/t5/Orbi-AX/New-RBK752-753-Firmware-Version-4-6-3-7-Released/m-p/213652...

 

 

Good Luck. 

My Setup ISP SparkLight | Internet Cable 1000↓/50↑ CM2000 Modem | Wifi Router RAXE50 and R8500(v.158) Router Mode | Switches NG GS105/8 | 

Additional NG HW: C7800/CAX80/CM1100/CM1200/CM2000, Orbi: CBK40, CBK752, RBK50, RBK853, RBK752, RBK953, SXK30 | NightHawk: R7000, R7800, R7960P, R8000, R8500, RAXE500, RAX50, XR450, EX7500/EX7700, GS308v3

Message 7 of 7
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