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To help understand the WireGuard concepts, we will show some practical setups that hopefully match many scenarios out there.
This is probably the most common setup for a VPN: connecting a single system to a remote site, and getting access to the remote network “as if you were there”.
Where to place the remote WireGuard endpoint in the network will vary a lot depending on the topology. It can be in a firewall box, the router itself, or some random system in the middle of the network.
Here we will cover a simpler case more resembling what a home network could be like:
public internet
xxxxxx ppp0 ┌────────┐
┌────┐ xx xxxx ──┤ router │
│ ├─ppp0 xxx xx └───┬────┘
│ │ xx x │ home 10.10.10.0/24
│ │ xxx xxx └───┬─────────┬─────────┐
└────┘ xxxxx │ │ │
┌─┴─┐ ┌─┴─┐ ┌─┴─┐
│ │ │ │ │ │
│pi4│ │NAS│ │...│
│ │ │ │ │ │
└───┘ └───┘ └───┘
This diagram represents a typical simple home network setup. You have a router/modem, usually provided by the ISP (Internet Service Provider), and some internal devices like a Raspberry PI perhaps, a NAS (Network Attached Storage), and some other device.
There are basically two approaches that can be taken here: install WireGuard on the router, or on another system in the home network.
Note that in this scenario the “fixed” side, the home network, normally won’t have a WireGuard Endpoint configured, as the peer is typically “on the road” and will have a dynamic IP address.