Lan upload over wifi kills download speed over internet

[HaoSs07]

the network: fiber in a ONT ( 300 down 100 up ) From ONT to router ( ont is in bridge mode) gb connection cable.



From router i have a GB connection to PC, and a wifi AC connection to my NAS.
when i download from the internet. i get around 30 MB / sec
When i upload to my NAS over wifi IN LAN . i get 32 MB / sec

here is where the problem begins :
if i download over internet and start uploading over WIFI in LAN to my NAS. upload to nas goes to 32 MB, Download from internet drops from 30 MB to 5 MB.

Any idea why ? HDD i do the transfers from is a 1 TB WD blue. PC reports usage around 50 %.

Router is a ASUS AC1200G+ (added by moderator).

 

[Ralston18]

Here is a link for your router's User Guide.

http://dlcdnet.asus.com/pub/ASUS/wireless/RT-AC1200G+/E11854_RT_AC1200G_PLUS_Manual.pdf?_ga=1.176009634.1498308758.1477146283

Confirm and, if not, try to find the correct manual.

In any case, take a look at the Traffic Manager (Quality of Service) settings starting on Page 28.

Hopefully there will be only some configuration change necessary to "balance" the uploading and downloading.

 

[HaoSs07]

Tried some obivious QOS settings. but did not end well. speed was way worse . Does not seem to be priority related tho. In theory should be enough power to upload and download at max speed

 

[kanewolf]

See what happens if your NAS is connected via wired interface. NAS on WIFI is usually a BAD idea.....

 

[HaoSs07]

well. i only need to upload movies to my NAS, don't store other files on it.. but i will test it and report