WireGuard VPN peer-to-site

Server Guide
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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.

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