Added wireguard on FreeBSD blog article

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+---
+title: Wireguard on FreeBSD
+description: How to configure a wireguard endpoint on FreeBSD
+date: 2023-02-16
+tags:
+- FreeBSD
+- vpn
+- wireguard
+---
+
+## Introduction
+
+This article explains how to configure wireguard on FreeBSD.
+
+## Installation
+
+```sh
+pkg install wireguard
+```
+
+## Generating keys
+
+The private and public keys for a host can be generated with the following commands:
+```sh
+PRIVATE_KEY=`wg genkey`
+PUBLIC_KEY=`printf $PRIVATE_KEY|wg pubkey`
+echo private_key: $PRIVATE_KEY
+echo public_key: $PUBLIC_KEY
+```
+
+## Configuration
+
+Here is a configuration example of my `/usr/local/etc/wireguard/wg0.conf` that creates a tunnel listening on udp port 342 and has one remote peer:
+```cfg
+[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
+```
+
+To implement this example you will need to generate two sets of keys. The configuration for the first server will feature the first server's private key in the `[Interface]` section and the second server's public key in the `[Peer]` section, and vice versa for the configuration of the second server.
+
+This example is from a machine 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 :
+```sh
+service wireguard enable
+echo 'wireguard_interfaces="wg0"' >> /etc/rc.conf
+service wireguard start
+```
+
+## Administration
+
+The tunnel can be managed with the `wg` command:
+```sh
+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
+```
+
+The ip configuration still relies on `ifconfig`:
+```sh
+root@hurricane:~# ifconfig wg0
+wg0: flags=80c1<UP,RUNNING,NOARP,MULTICAST> metric 0 mtu 1420
+        options=80000<LINKSTATE>
+        inet 10.1.2.7 netmask 0xffffff00
+        groups: wg
+        nd6 options=109<PERFORMNUD,IFDISABLED,NO_DAD>
+```