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How to configure a wireguard endpoint on Gentoo
Tags: gentoo linux vpn

Introduction

This article explains how to configure wireguard on Gentoo.

Configuration example

Here is a /etc/wireguard/wg0.conf configuration example to create a tunnel listening on udp port 342 and a remote peers :

[Interface]
PrivateKey = MzrfXLmSfTaCpkJWKwNlCSD20eDq7fo18aJ3Dl1D0gA=
ListenPort = 342
Address = 10.1.2.7/24

[Peer]
PublicKey = R4A01RXXqRJSY9TiKQrZGR85HsFNSXxhRKKEu/bEdTQ=
Endpoint = 168.119.114.183:342
AllowedIPs = 10.1.2.9/32
PersistentKeepalive = 60

Your private key goes on the first line as argument to wgkey, the other keys are public keys for each peer. In this example I setup a client that can be hidden behind nat therefore I configure a PersistentKeepalive. If your host has a public IP this line is not needed.

To activate the interface configuration, use :

cd /etc/init.d
ln -s wg-quick wg-quick.wg0
rc-update add wg-quick.wg0 default
/etc/init.d/wg-quick.wg0 start

Administration

Private keys can be generated with the following command :

openssl rand -base64 32

The tunnel can be managed with the wg command:

root@hurricane:~# wg
interface: wg0
  public key: 7fbr/yumFeTzXwxIHnEs462JLFToUyJ7yCOdeDFmP20=
  private key: (hidden)
  listening port: 342

peer: R4A01RXXqRJSY9TiKQrZGR85HsFNSXxhRKKEu/bEdTQ=
  endpoint: 168.119.114.183:342
  allowed ips: 10.1.2.9/32
  latest handshake: 57 seconds ago
  transfer: 1003.48 KiB received, 185.89 KiB sent
  persistent keepalive: every 1 minute