welim

Regular Contributor

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• #1

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

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• #2

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.

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• #3

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.

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• #4

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

Part of the Furniture

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• #5

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.

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• #6

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

Well, i was on the right track? What about WAN Aggregation?

Tech9

Part of the Furniture

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• #7

The modem has to have 2x LAN ports with 802.3ad support.

welim

Regular Contributor

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• #8

Thank you guys. I subscribe 3Gbps. The ONR/ONT has 10Gbps port. But my wifi router only support 1Gbps port. That’s why it limit me to 1G. While I understand I’m not using what I subscribe, the throughput test is about 700Mbps. I’ve limit the device to 60Mbps. If this device continuously access the full potential 60Mbps, it will still cause stability issue. I wanted to ask if this has got to do with ax88U modem router issue?

Thank you Bro/Sister, WH

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• #9

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

Simple solution - since you indicate the offending device is hardwired to the router lan port, just place a 5 port switch that only allows 100Mbit/s sync rate in between the router LAN port and the PC ethernet cable. Just need the additional 3 ft ethernet cable - Cat 5e is good enough. The PC will only be able to download at about 92 Mbit/s freeing up bandwidth for all the other users.

And turn off any QOS in the router. That will allow you to have full bandwidth of the WAN port available to all clients.

Tech9

Part of the Furniture

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• #10

If this device continuously access the full potential 60Mbps, it will still cause stability issue.

If this device is downloading torrents with hundreds of connections active at the same time - it will negatively affect your entire network user experience regardless of ISP plan and maximum download speeds.

welim

Regular Contributor

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• #11

Guys, using 100Mbps switch to limit it will not work. Even if I limit it to 40Mbps, once it started to download this big file, I can see the speed go up to full 40Mbps +- and the internet become unstable for the rest which it seems to have problem other than that device whom is downloading a huge file. https://huggingface.co/openai/gpt-oss-120b/blob/main/metal/model.bin file

Is ASUS router issue of not able to handle continuous download that crash or ?

Best Regards, WH

welim

Regular Contributor

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• #12

If I turn on QoS but put "File Transfer" as the least priority, it seems not working. It will still cause other traffic type like gaming, video etc to be super sluggish. Any idea what is wrong? My ONR (Optical modem) was 1Gbps and I uplifted to 3Gbps.... There is no use to this problem.

welim

Regular Contributor

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• #13

Is this ASUS AX88U not able to handle such traffic? I google and it says this:-

• Bufferbloat: This is a common phenomenon where a router’s internal memory buffers become flooded with data packets waiting to be processed. A 100GB download will continuously saturate the internet connection, causing the buffer to grow significantly. This results in high latency, which causes the entire network to feel sluggish or even freeze for other devices.

welim

Regular Contributor

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• #14

It also says this => lack robust Quality of Service (QoS) features that would allow them to prioritize different types of network traffic. A large download can hog all available bandwidth, leaving no room for other activities, such as web browsing or streaming on other devices.

I even think that ASUS QoS is not working because when file transfer is put least priority, it seems having no impact. It continue to cause problems for the rest of the traffic class.

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• #15

long known issue with ASUS QOS being broken.

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• #16

you may want to look at SMB gear - maybe Ubiquity or TP Link OMADA for example if this will be an ongoing thing that cannot be scheduled around other users.

Tech9

Part of the Furniture

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• #17

I’ve seen ASUS routers going down with specific transfer protocols like μTP. The reason I asked what’s the download.

welim

Regular Contributor

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• #18

@Tech9 , it is downloading file like this https://huggingface.co/openai/gpt-oss-120b/blob/main/metal/model.bin From the log file, it is SSL/TLS. I am not sure what is that. It is very disturbing that limit it to 40Mbps can still cause all the rest of the devices trying to access internet sluggish and sometime crash.

@degrub , I’ve reported this problem to ASUS tech support. Hopefully they can help. As of now, it is hard to invest into other router as my home is setup with AIMESH. Hope ASUS can fix their bad router issue. Somehow ASUS is bad in their router performance. Only good for wifi speed....

Tech9

Part of the Furniture

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• #19

This file download runs normally on my equipment, but perhaps this:

...is something your router struggles with. Is this the only download you have issues with?

welim

Regular Contributor

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• #20

It will download without problem. The issue is while downloading it, it will cause sluggishness for other users on the internet. The person downloading it and at the same time using internet seem not impacting but other users will have problem. It is up and down. Not always. Sometime I tested ok but sometime it will have problem with others. This is the link I know off that the user used. Everyday, he download files like 100G to 200G.