CentOS IKEv2 VPN服务配置指南

本文详细介绍了在CentOS系统上配置IKEv2 VPN服务的步骤。包括安装必要的软件包、配置IP地址、设置IKEv2策略、创建防火墙规则等。通过本文，读者可以掌握如何在CentOS上搭建稳定可靠的IKEv2 VPN服务。

IKEv2 VPN简介

IKEv2（Internet Key Exchange version 2）是IPsec（Internet Protocol Security，互联网协议安全）协议族中的一种安全协议，旨在在两个通信实体之间建立安全通道，IKEv2 VPN能够实现远程访问，保护数据传输安全，有效防止数据泄露。

准备工作

1、硬件环境：一台运行CentOS操作系统的服务器。

2、软件环境：安装以下软件包：

openswan：IPsec的软件实现。

strongswan：IPsec的另一个软件实现，本文以strongswan为例。

xauth：用于用户认证。

配置步骤

1、安装strongswan

```bash

yum install strongswan

```

2、配置strongswan

（1）编辑/etc/strongswan/strongswan.conf文件，修改以下参数：

```bash

config setup

charondebug="ike 2cpmi 20"

uniqueids=no

identity = "your-vpn-name"

altsubjectaltname = "/C=CN/ST=XX/L=XX/O=XX/CN=your-vpn-name"

privatekey = /etc/strongswan/keys/your-vpn-name.key

certificate = /etc/strongswan/certs/your-vpn-name.crt

ca = /etc/strongswan/certs/ca.crt

capath = /etc/strongswan/certs

cainfo = /etc/strongswan/certs/ca.crt

signatureprops = "signatures-only"

ikelifetime = 60m

keylife = 20m

rekeymargin = 3m

keyingtries = 1

authby = secret

keyexchange =ikev2

```

（2）配置IKEv2 VPN连接，编辑/etc/strongswan/ipsec.conf文件，添加以下内容：

```bash

config setup

charondebug="ike 2cpmi 20"

uniqueids=no

identity = "your-vpn-name"

altsubjectaltname = "/C=CN/ST=XX/L=XX/O=XX/CN=your-vpn-name"

privatekey = /etc/strongswan/keys/your-vpn-name.key

certificate = /etc/strongswan/certs/your-vpn-name.crt

ca = /etc/strongswan/certs/ca.crt

capath = /etc/strongswan/certs

cainfo = /etc/strongswan/certs/ca.crt

signatureprops = "signatures-only"

ikelifetime = 60m

keylife = 20m

rekeymargin = 3m

keyingtries = 1

authby = secret

keyexchange =ikev2

conn myvpn

left=%defaultroute

leftid=%identity

leftsourceip=%config

leftsubnet=0.0.0.0/0

right=%any

rightid=your-vpn-name

rightsourceip=your-vpn-ip

rightsubnet=0.0.0.0/0

auto=add

```

（3）重启strongswan服务，使配置生效：

```bash

systemctl restart strongswan

```

至此，CentOS系统上的IKEv2 VPN服务配置完成，用户可以通过连接到VPN，实现安全、高效的远程访问。