ASUS AX88U causes problems for others using internet if one device continuously do a 100G file txr

[welim]

Dear Sir/Mdm,

My ASUS router AX88U is connected to an optical ONR modem. It is a 1Gbps RJ45 connection despite my optical ONR modem RJ45=10Gbps. I subscribe a 3Gbps speed plan however.
My problem is this. If one of my device connect to ASUS AX88U RJ45 LAN port and do a huge data file download of around 100G, it will slow down or sometime causes problem with my youtube video or gaming experience.

If I do an internet speed test using ASUS build-in test, it says my internet speed is SUPER.

Q1. Is there a way to solve this problem to prevent ASUS router from crash or instability if someone doing a huge file download ?
Q2. If I use the BW limiter to 60gbps download and 20gbps upload, it will still be unstable and sluggish for others.
What is the limit we should set ? Is there a known bug in ASUS router that it cannot process heavy load download ? Any other setting I can do to help on this?

Best Regards,
WH

 

[Tech9]

If I use the BW limiter

If you enable Bandwidth Limiter on this router your WAN-LAN throughput will drop to around 300Mbps for the entire network. This feature is NAT acceleration incompatible. Limit the speed at the client device doing the large transfer instead.

I subscribe a 3Gbps speed

You pay for ISP plan you can't use.

 

[bbunge]

If your optical modem has more than one Ethernet port you can set up Dual WAN to, in theory, double the bandwidth between the modem and router.
If you have QOS enabled disable it.

 

[Ripshod]

Also, if one machine is maxing out your WAN connection to the ONT then of course it's going to cause problems for any other devices.
The only reason for me to ever recommend a "download manager" is the speed controls many of them have built in. Slow the downloads and enjoy your gaming/streaming. Control doesn't necessarily start and stop at the router.

 

[Tech9]

If your optical modem has more than one Ethernet port you can set up Dual WAN

No. Even if the ONT has built-in Gateway - Dual WAN with the same subnet WAN connections won't work.