linux vps安装OpenVPN详细教程
具体安装OpenVPN的过程如下：
安装RPMForge：
下载rpmforge-release
i386: http://apt.sw.be/redhat/el5/en/i386/RPMS.dag/rpmforge-release-0.3.6-1.el5.rf.i386.rpm
x86_64: http://apt.sw.be/redhat/el5/en/x86_64/RPMS.dag/rpmforge-release-0.3.6-1.el5.rf.x86_64.rpm
导入KEY
rpm --import http://dag.wieers.com/rpm/packages/RPM-GPG-KEY.dag.txt
安装
rpm -i rpmforge-release-0.3.6-1.el5.rf.*.rpm
测试
yum check-update
安装OpenVPN：
可能系统之前没有安装openssl相关组件，先安装下
yum install openssl openssl-devel -y
然后再安装openvpn
yum install openvpn -y
根据提示会下载几个相关的软件包，一路按y确定就可以了。
生成证书和key：
find / -name easy-rsa #搜索easy-rsa目录
#一般会在下面的目录中找到
cd /usr/share/doc/openvpn-2.0.9/easy-rsa
. vars #注意：点和vars之间有个空格
chmod 777 *
./clean-all
./build-ca #Common Name输入server，其他默认
./build-key-server server #Comman Name输入server，其他默认，最后按y生成证书
./build-key client01 #Comman Name输入client01，其他默认，最后按y生成证书
#如果需要多个客户端登录，依次生成其他客户端证书/key
./build-key client02
./build-key client03
#要注意，每个客户端的Comman Name必须不同
./build-dh
mkdir /etc/openvpn
cp keys /etc/openvpn -r #将keys文件夹复制到/etc/openvpn目录
tar -cf keys.tar keys #将打包好的keys.tar文件下载到本地
修改配置文件：
cd ..
cd sample-config-files
cp server.conf /usr/local/etc
vi /usr/local/etc/server.conf
服务端配置文件：
local 你VPS的IP地址
port 1194
proto tcp
dev tun
ca /etc/openvpn/keys/ca.crt
cert /etc/openvpn/keys/server.crt
key /etc/openvpn/keys/server.key
dh /etc/openvpn/keys/dh1024.pem
server 10.8.0.0 255.255.255.0
push "dhcp-option DNS 10.8.0.1
push "dhcp-option DNS 208.67.222.222
push "dhcp-option DNS 208.67.220.220
client-to-client
keepalive 10 120
comp-lzo
persist-key
persist-tun
status /etc/openvpn/keys/openvpn-status.log
verb 4
cp client.conf /usr/local/etc
vi /usr/local/etc/client.conf
客户端配置文件：
client
dev tun
proto tcp
remote 你vps的ip 1194
persist-key
persist-tun
ca ca.crt
cert client01.crt
key client01.key
#这里的两个文件名必须和前面生成的证书文件名一样
ns-cert-type server
comp-lzo
verb 3
redirect-gateway def1
运行OpenVPN：
/usr/sbin/openvpn --config /usr/local/etc/server.conf
配置iptables转发规则：
/sbin/iptables -t nat -A POSTROUTING -s 10.8.0.0/255.255.255.0 -j SNAT --to-source 你vps的ip
/etc/init.d/iptables save
/etc/init.d/iptables restart
开启ip-forward：
运行：sysctl -a | grep for
net.ipv6.conf.lo.force_mld_version = 0
net.ipv6.conf.lo.forwarding = 1
net.ipv6.conf.default.force_mld_version = 0
net.ipv6.conf.default.forwarding = 1
net.ipv6.conf.all.force_mld_version = 0
net.ipv6.conf.all.forwarding = 1
net.ipv4.ip_forward = 1
net.ipv4.conf.tun0.force_igmp_version = 0
net.ipv4.conf.tun0.mc_forwarding = 0
net.ipv4.conf.tun0.forwarding = 1
net.ipv4.conf.venet0.force_igmp_version = 0
net.ipv4.conf.venet0.mc_forwarding = 0
net.ipv4.conf.venet0.forwarding = 1
net.ipv4.conf.lo.force_igmp_version = 0
net.ipv4.conf.lo.mc_forwarding = 0
net.ipv4.conf.lo.forwarding = 1
net.ipv4.conf.default.force_igmp_version = 0
net.ipv4.conf.default.mc_forwarding = 0
net.ipv4.conf.default.forwarding = 1
net.ipv4.conf.all.force_igmp_version = 0
net.ipv4.conf.all.mc_forwarding = 0
net.ipv4.conf.all.forwarding = 1
如果你的主机上列数值不是为1， 则要将其改成1
例如：sysctl -w net.ipv4.ip_forward=1
设置OpenVPN开机自动运行：
vi /etc/rc.local
在最后面加入此行:
/usr/sbin/openvpn --config /usr/local/etc/server.conf/dev/null 21
Windows下客户端的安装配置：
下载OpenVPN GUI For Windows
http://openvpn.se/files/install_packages/openvpn-2.0.9-gui-1.0.3-install.exe
依屏幕指示安装OpenVPN GUI
安装结束后，进入安装文件夹的config目录，将之前在VPS上建立的client.conf文件下载到该目录，并更名为client.ovpn
把之前打包的keys.tar也解压到config目录里。
然后右键点击client.ovpn选择Start OpenVPN on this config file
或者从开始菜单里运行OpenVPN GUI，在右下角图标上点右键选Connect
成功连接后，右下角的OpenVPN GUI图标会由红色变为绿色。这时你就可以使用BurstNET搭建的VPN了。
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