前言
VPN (Virtual Private Network) 虚拟私有网络 (也有叫虚拟专用网络的)，是在互联网上使用各种技术构建出一个加密隧道，然后通过这个隧道直达对端，与对端形成一种局域互联的技术，VPN可以实现以局域互联的身份使用到远程网络资源的效果
作为翻墙越货，登堂入室，隐身马甲之必备神器，很有必要了解一点，这里我分享一下在Linux中搭建的方法
概要
环境
内核版本 2.6.32-504.el6.x86_64
系统版本 CentOS release 6.6 (Final)
代码语言：javascript复制[root@pptp-server ~]# uname -a
Linux pptp-server.cloud.com 2.6.32-504.el6.x86_64 #1 SMP Wed Oct 15 04:27:16 UTC 2014 x86_64 x86_64 x86_64 GNU/Linux
[root@pptp-server ~]# cat /etc/issue
CentOS release 6.6 (Final)
Kernel r on an m
[root@pptp-server ~]# 安装ppp软件包
代码语言：javascript复制[root@pptp-server ~]# yum install ppp
Loaded plugins: fastestmirror, security
Setting up Install Process
Determining fastest mirrors
addons | 3.4 kB 00:00
addons/primary_db | 4.4 MB 00:00
base | 3.7 kB 00:00
base/primary_db | 4.6 MB 00:00
centosplus | 3.4 kB 00:00
centosplus/primary_db | 2.0 MB 00:00
contrib | 2.9 kB 00:00
contrib/primary_db | 1.2 kB 00:00
dag | 1.9 kB 00:00
dag/primary_db | 2.7 MB 00:00
epel | 4.3 kB 00:00
epel/primary_db | 5.7 MB 00:00
extras | 3.4 kB 00:00
extras/primary_db | 31 kB 00:00
update | 3.4 kB 00:00
update/primary_db | 4.4 MB 00:00
Package iptables-1.4.7-14.el6.x86_64 already installed and latest version
Resolving Dependencies
--> Running transaction check
---> Package ppp.x86_64 0:2.4.5-5.el6 will be installed
--> Finished Dependency Resolution
Dependencies Resolved
====================================================================================================================================
Package Arch Version Repository Size
====================================================================================================================================
Installing:
ppp x86_64 2.4.5-5.el6 base 323 k
Transaction Summary
====================================================================================================================================
Install 1 Package(s)
Total download size: 323 k
Installed size: 760 k
Is this ok [y/N]: y
Downloading Packages:
ppp-2.4.5-5.el6.x86_64.rpm | 323 kB 00:00
warning: rpmts_HdrFromFdno: Header V3 RSA/SHA256 Signature, key ID c105b9de: NOKEY
Retrieving key from http://yum.ksyun.cn/centos/RPM-GPG-KEY-CentOS-6
Importing GPG key 0xC105B9DE:
Userid: "CentOS-6 Key (CentOS 6 Official Signing Key) <centos-6-key@centos.org>"
From : http://yum.ksyun.cn/centos/RPM-GPG-KEY-CentOS-6
Is this ok [y/N]: y
Running rpm_check_debug
Running Transaction Test
Transaction Test Succeeded
Running Transaction
Installing : ppp-2.4.5-5.el6.x86_64 1/1
Verifying : ppp-2.4.5-5.el6.x86_64 1/1
Installed:
ppp.x86_64 0:2.4.5-5.el6
Complete!
[root@pptp-server ~]# 
