在FreeBSD上启动和配置OpenVPN

这段示例代码演示了如何在FreeBSD上启动和配置OpenVPN以建立安全的VPN连接。它包括安装OpenVPN，生成证书和密钥，创建配置文件，并启动OpenVPN服务器和客户端。实现具体包括使用pkg安装OpenVPN，使用EasyRSA生成证书和密钥，编辑配置文件并分别使用systemctl命令启动OpenVPN服务端和客户端。

# pkg install openvpn
# mkdir /usr/local/etc/openvpn
# cp /usr/local/share/examples/openvpn/sample-config-files/server.conf /usr/local/etc/openvpn/
# cd /usr/local/etc/openvpn/
# mkdir easy-rsa
# cp -r /usr/local/share/easy-rsa/ /usr/local/etc/openvpn/
# cd /usr/local/etc/openvpn/easy-rsa/
# ./easyrsa init-pki
# ./easyrsa gen-dh
# ./easyrsa build-ca
# ./easyrsa build-server-full server nopass
# ./easyrsa build-client-full client1 nopass
# . /usr/local/etc/openvpn/easy-rsa/vars
# cd /usr/local/etc/openvpn
# vi server.conf
# sysrc openvpn_enable=YES
# systemctl start openvpn-server
# systemctl start openvpn-client@client1

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