Secondary router ASUS TUF AX5400 slowing me down ~200Mbps

[Veliyan]

Hi everyone!

 

I am having issues with my ASUS TUF AX5400 router.

The setup is using two routers, one of them is from the ISP which unfortunately is required because of the IPTV output on one of the ports - they are not willing to share the details of how the ports are configured.

The second router is the ASUS so at least I could have some customizability/security inside my house.

I am subscribed for a 1Gbps internet.

When my PC is connected directly to the ISP router via cat6 cable I am getting results around 930-950 Mbps down.

When I am connected to the ASUS router via the same cable I am getting only 720-730 Mbps. When I shut it down and leave it for 10 minutes off and restart it I am getting around 900 Mbps(which is acceptable), but then each test(5 minutes for all tests) gets worse until it settles at around 720-730 Mbps.

All tests are performed when no other devices are connected to the routers except the IPTV STB on the ISP router.

ISP Router has disabled Wifi radios, while the ASUS TUF only has two(main and guest) 5GHz enabled.

The router doesn't seem that warm to the touch, but I have tried adding a laptop cooler pad(those with the blowers) beneath it which doesn't help.(I mention this because my previous TP-Link Archer AX50 was overheating and limiting to 230Mbps)

 

Mobo: Gigabyte Aorus Z690 with 2.5G Ethernet

 

Here are some pictures:

ISP LAN to my PC

 

and this is the result while on the TUF

 

Why are we using these ~200Mbps(down), do you guys have any idea?

 

Thanks in advance!

[manikyath]

i wouldnt be surprised if the router simply cant reliably route a full gigabit between LAN and WAN side.

even some business grade routers struggle with that.

[191x7]

Turn off Green Ethernet and Energy Efficient Ethernet.

[Ralphred]

5 minutes ago, manikyath said:

even some business grade routers struggle with that

People don't realise routing is done in software on "routers", and things like NAT (especially masquerading) have a high cost.

 

13 minutes ago, Veliyan said:

All tests are performed when no other devices are connected to the routers except the IPTV STB on the ISP router.

What happens if you turn off all the shit on the Asus device that isn't to do with routing, and/or use a DMZ for your PC?

Is the firmware up to date?

 

Here are some red flags from the devices webpage

Quote

Maximum port forwarding rule : 64

Everything in "Traffic Control"

Link Agregation (2Gbps wired connection)*

DDNS : Yes

Routers are there to hump packets between WAN <> LAN, you want a firewall buy a firewall, you want 6 network ports buy a switch, you want wireless buy an AP, any service that isn't explicitly to do with routing, put it on a server, especially if it has the word "Dynamic" or "Cache" involved, these all in one devices are a scourge.

 

*This is a huge tell, they are basically saying you need to use some kind of LACP to get over a @1Gbps wired connection to it

 

As a quick eye opener, look at the "firewall throughput" capabilities on https://www.draytek.co.uk/products/comparison/router-comparison and see how much something that can route ~900Mbps through a firewall costs, and how much one with 2.5Gbps wan/lan ports costs, then save 50% by building your own with an old PC and a dual port 2.5Gbps nic.

[Veliyan]

I found the issue guys...

 

Stupid TUF marketing bullsh...

Fun fact: When disabled the option the latency dropped from 2ms  to 1ms...

Once I have disabled "Game Accelerator" everything is working as expected and there is no loss in bandwidth...

 

Even though I was on the "Gaming" port the router just bottlenecked the connection...

 

Thanks all for your ideas!

Edited April 28, 2022 by Veliyan

[Alex Atkin UK]

8 hours ago, Veliyan said:

I found the issue guys...

 

Stupid TUF marketing bullsh...

Fun fact: When disabled the option the latency dropped from 2ms  to 1ms...

Once I have disabled "Game Accelerator" everything is working as expected and there is no loss in bandwidth...

 

Even though I was on the "Gaming" port the router just bottlenecked the connection...

 

Thanks all for your ideas!

Its actually impressive it went as fast as it did with that enabled, that sort of things usually eats CPU as it will be trying to keep some spare bandwidth to prioritise gaming traffic.