Raspberry Pi 4 as LAN-Router

[fatzgenfatz]

Hi,
just for the fun of it I would like to try this:

Ethernet Wall Plug (Fiber2Copper Converter) with PPPoe -> RPi4 with SQM, DHCP-Server, Wireguard/OpenVPN-Server,... -> Switch -> OpenWrt router as AccessPoint.
The DNS-Servers (PiHole) would be on other Devices on the Switch.
I would use an USB2Ethernet adapter to connect the RPi to the switch.
The RPi should be fast enough to handle the fiber speed (only 150/20 at the Moment) and VPN connection(s)
This should be possible? Or are there any problems that might occur?

Thanks,
f.

[94121-usr]

Just for fun...

2Gb RPi4 kit from Vilros with aluminum case/heatsink
8Gb industrial microSD, (use Rufus portable to flash)
GS108Ev3 WAN/Port1/vlan3, LAN/Port2-3/untagged vlan1, vlan20/port4-5, vlan30/port 6-7, trunk/port8

Do it!

getting a kernel error with snapshot r15200
setting a different scaling frequency, the error does not occur
$ echo 750000 > /sys/devices/system/cpu/cpufreq/policy0/scaling_min_freq
$ echo 1000000 > /sys/devices/system/cpu/cpufreq/policy0/scaling_max_freq

[trendy]

I currently have a usb3 to gigaeth adapter for the wan interface, but at the beginning I was using dot1q subinterface for the wan.

[fatzgenfatz]

I just did it and it works great!
I didn't even need a switch because my WLAN-Bridge has two ETH-Ports, one for the Pi, one for the OpenWRT device.
The bridge connects my office to the rpi, the speed is sufficient. The devices in the Office (NAS, Pi-Hole, Video-Disk-Recorder, main PC) are connected by 1Gb Ethernet.
The kitchen is connected via OpenWrt WDS client, speed is sufficient to stream Videos while cooking.

[Hegabo]

@fatzgenfatz

The RPi should be fast enough to handle the fiber speed (only 150/20 at the Moment)

For this speed, you could just trunk both LAN and WAN on the same cable, as @94121-usr pointed out, as long as the switch supports tagging.

[fatzgenfatz]

Yes, that should work, but I had an USB2Ethernet adapter lying around and decided to not use a switch (look at my last post).