SQM with Asus RT-ACRH17, 300/75, VPN

Hardware Questions and Recommendations
1

I'm setting up an older Asus RT-ACRH17 (a.k.a. RT-AC42U) for a friend's house with 300/75 Mbps fiber (my full and complete explanation for that service plan is: small-town Canada).

This is a Qualcomm IPQ4019 device, quad-core, 717 MHz, 256 MiB RAM:
https://wikidevi.wi-cat.ru/ASUS_RT-ACRH17
https://openwrt.org/toh/hwdata/asus/asus_rt-ac42u

It's currently running OpenWrt 23.05.2.

There will be a couple of local networks; one will encompass most of the computers, game consoles, streaming devices, etc in the house. Another will be for a couple of computers that are fully tunneled over a Wireguard privacy VPN.

I'm trying to figure out if it's worthwhile to attempt SQM in this situation. Mainly, does this router have enough horsepower to handle WireGuard + SQM at 300 Mbps in the first place? Unfortunately this isn't a situation where I can do a bunch of testing; I need to make the decision in advance and hope for minimal trouble when I'm actually on location.

A second question, if the above can be answered "yes", is how the VPN interacts with SQM setup. I'm sorry if this is answered somewhere else already; I've done some searching but can't seem to find a straightforward answer. Does configuring SQM on the wan interface alone also encompass the WireGuard traffic?

2

No, it does not. Without anything special, ipq4019 could do just over 300 MBit/s in my testing - VPN and even more SQM will eat into the margins. While I would suggest just trying how far you can get, sqm is beyond its abilities at those speeds - and VPN client most likely as well (VPN server tends to be more forgiving, as it's not in use all the time and rarely pushes the boundaries).

1 Like
3

OK, thank you for the heads-up!

Looks like I may need to make alternate plans for the VPN. I wish my GL.iNet MT2500 ("Brume 2") was fully supported in OpenWrt; that would do the trick. Guess I could give it a shot with the stock firmware for the time being.

4

it is fully supported, just not in stable, since it didn't make it in time for the 23.05 release.

5

Oh, I thought I read that a couple of features were still broken/non-functional... but now trying to search for that, I'm not finding anything.

Looks like I can give it a try!

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