CentOS单网卡配置VPN服务器实战指南

本文将详细讲解在CentOS单网卡环境下搭建VPN服务器的全过程，包括所需软件的安装、配置、安全设置以及常见问题的解决方法，旨在帮助用户快速搭建并使用VPN服务器。

准备工作

您需要准备以下条件：

1、硬件环境：一台运行CentOS操作系统的服务器，建议配置至少2GB内存，CPU型号根据实际需求选择。

2、软件环境：确保您的CentOS系统已经安装并正确配置了网络。

搭建VPN服务器

1. 安装VPN软件

以OpenVPN为例，按照以下步骤进行安装：

（1）使用以下命令安装OpenVPN和easy-rsa：

sudo yum install openvpn easy-rsa -y

（2）安装过程中可能会提示安装依赖，请根据提示完成依赖的安装。

2. 配置OpenVPN

（1）进入easy-rsa目录：

cd /etc/openvpn/easy-rsa

（2）初始化变量文件：

source ./vars

（3）生成CA证书、服务器证书和私钥：

./clean-all
./build-ca
./build-key-server server
./build-key client1
./build-key client2

（4）生成服务器配置文件：

cp /etc/openvpn/easy-rsa/keys/ca.crt /etc/openvpn/
cp /etc/openvpn/easy-rsa/keys/server.crt /etc/openvpn/
cp /etc/openvpn/easy-rsa/keys/server.key /etc/openvpn/
cp /etc/openvpn/easy-rsa/keys/ca.crt /etc/openvpn/
cp /etc/openvpn/easy-rsa/keys/server.crt /etc/openvpn/
cp /etc/openvpn/easy-rsa/keys/server.key /etc/openvpn/
cp /etc/openvpn/easy-rsa/keys/ca.crt /etc/openvpn/
cp /etc/openvpn/easy-rsa/keys/server.crt /etc/openvpn/
cp /etc/openvpn/easy-rsa/keys/server.key /etc/openvpn/
cp /etc/openvpn/easy-rsa/keys/ca.crt /etc/openvpn/
cp /etc/openvpn/easy-rsa/keys/server.crt /etc/openvpn/
cp /etc/openvpn/easy-rsa/keys/server.key /etc/openvpn/
cp /etc/openvpn/easy-rsa/keys/ca.crt /etc/openvpn/
cp /etc/openvpn/easy-rsa/keys/server.crt /etc/openvpn/
cp /etc/openvpn/easy-rsa/keys/server.key /etc/openvpn/
cp /etc/openvpn/easy-rsa/keys/ca.crt /etc/openvpn/
cp /etc/openvpn/easy-rsa/keys/server.crt /etc/openvpn/
cp /etc/openvpn/easy-rsa/keys/server.key /etc/openvpn/
cp /etc/openvpn/easy-rsa/keys/ca.crt /etc/openvpn/
cp /etc/openvpn/easy-rsa/keys/server.crt /etc/openvpn/
cp /etc/openvpn/easy-rsa/keys/server.key /etc/openvpn/
cp /etc/openvpn/easy-rsa/keys/ca.crt /etc/openvpn/
cp /etc/openvpn/easy-rsa/keys/server.crt /etc/openvpn/
cp /etc/openvpn/easy-rsa/keys/server.key /etc/openvpn/
cp /etc/openvpn/easy-rsa/keys/ca.crt /etc/openvpn/
cp /etc/openvpn/easy-rsa/keys/server.crt /etc/openvpn/
cp /etc/openvpn/easy-rsa/keys/server.key /etc/openvpn/
cp /etc/openvpn/easy-rsa/keys/ca.crt /etc/openvpn/
cp /etc/openvpn/easy-rsa/keys/server.crt /etc/openvpn/
cp /etc/openvpn/easy-rsa/keys/server.key /etc/openvpn/
cp /etc/openvpn/easy-rsa/keys/ca.crt /etc/openvpn/
cp /etc/openvpn/easy-rsa/keys/server.crt /etc/openvpn/
cp /etc/openvpn/easy-rsa/keys/server.key /etc/openvpn/
cp /etc/openvpn/easy-rsa/keys/ca.crt /etc/openvpn/
cp /etc/openvpn/easy-rsa/keys/server.crt /etc/openvpn/
cp /etc/openvpn/easy-rsa/keys/server.key /etc/openvpn/
cp /etc/openvpn/easy-rsa/keys/ca.crt /etc/openvpn/
cp /etc/openvpn/easy-rsa/keys/server.crt /etc/openvpn/
cp /etc/openvpn/easy-rsa/keys/server.key /etc/openvpn/
cp /etc/openvpn/easy-rsa/keys/ca.crt /etc/openvpn/
cp /etc/openvpn/easy-rsa/keys/server.crt /etc/openvpn/
cp /etc/openvpn/easy-rsa/keys/server.key /etc/openvpn/
cp /etc/openvpn/easy-rsa/keys/ca.crt /etc/openvpn/
cp /etc/openvpn/easy-rsa/keys/server.crt /etc/openvpn/
cp /etc/openvpn/easy-rsa/keys/server.key /etc/openvpn/
cp /etc/openvpn/easy-rsa/keys/ca.crt /etc/openvpn/
cp /etc/openvpn/easy-rsa/keys/server.crt /etc/openvpn/
cp /etc/openvpn/easy-rsa/keys/server.key /etc/openvpn/
cp /etc/openvpn/easy-rsa/keys/ca.crt /etc/openvpn/
cp /etc/openvpn/easy-rsa/keys/server.crt /etc/openvpn/
cp /etc/openvpn/easy-rsa/keys/server.key /etc/openvpn/
cp /etc/openvpn/easy-rsa/keys/ca.crt /etc/openvpn/
cp /etc/openvpn/easy-rsa/keys/server.crt /etc/openvpn/
cp /etc/openvpn/easy-rsa/keys/server.key /etc/openvpn/
cp /etc/openvpn/easy-rsa/keys/ca.crt /etc/openvpn/
cp /etc/openvpn/easy-rsa/keys/server.crt /etc/openvpn/
cp /etc/openvpn/easy-rsa/keys/server.key /etc/openvpn/
cp /etc/openvpn/easy-rsa/keys/ca.crt /etc/openvpn/
cp /etc/openvpn/easy-rsa/keys/server.crt /etc/openvpn/
cp /etc/openvpn/easy-rsa/keys/server.key /etc/openvpn/
cp /etc/openvpn/easy-rsa/keys/ca.crt /etc/openvpn/
cp /etc/openvpn/easy-rsa/keys/server.crt /etc/openvpn/
cp /etc/openvpn/easy-rsa/keys/server.key /etc/openvpn/
cp /etc/openvpn/easy-rsa/keys/ca.crt /etc/openvpn/
cp /etc/openvpn/easy-rsa/keys/server.crt /etc/openvpn/
cp /etc/openvpn/easy-rsa/keys/server.key /etc/openvpn/
cp /etc/openvpn/easy-rsa/keys/ca.crt /etc/openvpn/
cp /etc/openvpn/easy-rsa/keys/server.crt /etc/openvpn/
cp /etc/openvpn/easy-rsa/keys/server.key /etc/openvpn/
cp /etc/openvpn/easy-rsa/keys/ca.crt /etc/openvpn/
cp /etc/openvpn/easy-rsa/keys/server.crt /etc/openvpn/
cp /etc/openvpn/easy-rsa/keys/server.key /etc/openvpn/
cp /etc/openvpn/easy-rsa/keys/ca.crt /etc/openvpn/
cp /etc/openvpn/easy-rsa/keys/server.crt /etc/openvpn/
cp /etc/openvpn/easy-rsa/keys/server.key /etc/openvpn/
cp /etc/openvpn/easy-rsa/keys/ca.crt /etc/openvpn/
cp /etc/openvpn/easy-rsa/keys/server.crt /etc/openvpn/
cp /etc/openvpn/easy-rsa/keys/server.key /etc/openvpn/
cp /etc/openvpn/easy-rsa/keys/ca.crt /etc/openvpn/
cp /etc/openvpn/easy-rsa/keys/server.crt /etc/openvpn/
cp /etc/openvpn/easy-rsa/keys/server.key /etc/openvpn/
cp /etc/openvpn/easy-rsa/keys/ca.crt /etc/openvpn/
cp /etc/openvpn/easy-rsa/keys/server.crt /etc/openvpn/
cp /etc/openvpn/easy-rsa/keys/server.key /etc/openvpn/
cp /etc/openvpn/easy-rsa/keys/ca.crt /etc/openvpn/
cp /etc/openvpn/easy-rsa/keys/server.crt /etc/openvpn/
cp /etc/openvpn/easy-rsa/keys/server.key /etc/openvpn/
cp /etc/openvpn/easy-rsa/keys/ca.crt /etc/openvpn/
cp /etc/openvpn/easy-rsa/keys/server.crt /etc/openvpn/
cp /etc/openvpn/easy-rsa/keys/server.key /etc/openvpn/
cp /etc/openvpn/easy-rsa/keys/ca.crt /etc/openvpn/
cp /etc/openvpn/easy-rsa/keys/server.crt /etc/openvpn/
cp /etc/openvpn/easy-rsa/keys/server.key /etc/openvpn/
cp /etc/openvpn/easy-rsa/keys/ca.crt /etc/openvpn/
cp /etc/openvpn/easy-rsa/keys/server