Dell Wyse 3040 as a WireGuard Router

I recently purchased a Dell Wyse 3040 off of eBay for £30. They're designed to be used as thin clients but make excellent Linux servers in any homelab. Think Raspberry Pi 4 but x86 and in stock!

Specs:

Quad-core Atom CPU
2GB of RAM
8/16 GB of eMMC storage
1.3W idle

I'm using mine as a WireGuard router

What does this mean? My 3040:

Runs AdGuard for DNS and DHCP (on a seperate VLAN)
Routes all traffic via a WireGuard VPN provider

I initially installed and configured OPNsense but WireGuard throughput was limited to around 220Mbps, even with Kernel WireGuard. WireGuard when used with Debian on the Wyse 3040 can hit 850Mbps.

It turns out configuring Debian as a router is incredibly easy:

Install Debian following these instructions, I didn't need to provide the LAN driver at boot, add non-free to sources.list and install firmware-realtek once booted.

apt update && apt install firmware-realtek

Configure your VLAN interface

nano /etc/network/interfaces

auto eth0.109
iface eth0.109 inet static
    address 192.168.109.2
    netmask 255.255.255.0

service networking restart

Install Docker

curl -fsSL https://get.docker.com -o get-docker.sh
sh get-docker.sh

Install Adguard and configure this for encrypted DNS and DHCP

docker run --name adguardhome --network host --restart unless-stopped -v /opt/adguardhome/work:/opt/adguardhome/work -v /opt/adguardhome/conf:/opt/adguardhome/conf -d adguard/adguardhome

Install WireGuard and setup your tunnel, be sure to use AllowedIPs = 0.0.0.0/0
Use iptables to force all traffic for our new VLAN out via the WireGuard interface

echo 1 > /proc/sys/net/ipv4/ip_forward
iptables -t nat -A POSTROUTING -o wg0 -j MASQUERADE
iptables -A INPUT -i enp1s0.109 -j ACCEPT
iptables -A INPUT -i wg0 -m state --state ESTABLISHED,RELATED -j ACCEPT
iptables -A OUTPUT -j ACCEPT

apt install iptables-persistent