利用Openbsd和Openvpn快速建立企业的VPN

一种是IP遂道路由模式,主要应用于点对点

一种是基于以太网的遂道桥模式, 应用于点对多点,有多个分支机构

本文介绍的配置实例是第一种

局域网1:

OFFICE主机装openbsd3.4 两块网卡

rl1接公网 61.131.58.x ,

rl0接 内网192.168.1.222

vpn 10.1.0.1

A client主机 192.168.1.22

局域网2:

HOME主机装redhat9.0两块网卡

rl1 接公网 218.85.158.244

rl0 接内网 192.168.0.222

vpn 10.1.0.2

B client主机 192.168.0.45

环境:openbsd3.4+lzo+openssl+openvpn

openssl用来进行加密，lzo用来进行数据压缩

下载地址 http://prdownloads.sourceforge.net/openvpn/openvpn-2.0_beta7.tar.gz

http://www.oberhumer.com/opensource/lzo/download/lzo-1.08.tar.gz

openbsd的安装就不说了

openssl在openbsd下是默认安装的

我将openvpn-2.0.beta7.tar.gz和lzo-1.08.tar.gz下载到/home

#cd /home

#tar zxvf lzo-1.08.tar.gz

#cd lzo-1.08.

#./comfigure

#make

#make install

#tar zxvf openvpn-2.0_beta7.tar.gz

#cd openvpn-2.0_beta7

#./configure --with-lzo-headers=/usr/local/include --with-lzo-lib=/usr/local/lib

#make

#make install

#mkdir /etc/openvpn

#cd /etc/openvpn

#openvpn --genkey --secret static.key

将static.key从office主机复制到home主机的/etc/openvpn目录中

office#scp static.key root@218.85.158.244:/etc/openvpn

参考/home/openvpn-2.0_beta7/sample-config-files下的文件

建立以下几个配置文件及脚本文件

office.up和openvpn-startup.sh脚本

static-office.conf配置文件

我的office主机的配置例子如下

office.up如下

#!/bin/sh

route add -net 192.168.0.0/24 10.1.0.2

openvpn-startup.sh如下

#!/bin/sh

/usr/local/sbin/openvpn --config /etc/openvpn/static-office.conf

static-office.conf如下

dev tun0

remote 218.85.158.244

ifconfig 10.1.0.1 10.1.0.2

up ./office.up

secret /etc/openvpn/static.key

port 5000

comp-lzo

ping 15

ping 15

ping-restart 45

ping-timer-rem

persist-tun

persist-key

verb 3

我的home主机的配置例子如下

home.up如下

#!/bin/sh

route add –net 192.168.1.0/24 10.1.0.1

openvpn-startup.sh如下

#!/bin/sh

/usr/local/sbin/openvpn --config /etc/openvpn/static-home.conf

static-home.conf如下

dev tun0

remote 61.131.58.x

ifconfig 10.1.0.2 10.1.0.1

up ./home.up

secret /etc/openvpn/static.key

port 5000

comp-lzo

ping 15

ping 15

ping-restart 45

ping-timer-rem

persist-tun

persist-key

verb 3

在office主机及home主机两端起用pf防火墙,编辑/etc/sysctl.conf

net.inet.ip.forwarding=1

net.inet6.ip6.forwarding=1并去掉前面的#号

编辑/etc/rc.conf

pf=YES

我的office主机的pf.conf如下:

ext_if="rl1" # replace with actual external interface name i.e., dc0

int_if="rl0" # replace with actual internal interface name i.e., dc1

internal_net="192.168.1.0/24"

priv_nets="{

127.0.0.0/8,

192.168.0.0/16,

172.16.0.0/12,

10.0.0.0/8

}"

set optimization aggressive

scrub in all

nat on $ext_if from $internal_net to any -> 61.131.58.x/32

block all

pass quick on lo0 all

pass quick on tun0 all

pass in on $int_if from any to any keep state

pass out on $int_if from any to any keep state

block drop in quick on $ext_if from $priv_nets to any

block drop out quick on $ext_if from any to $priv_nets

pass out on $ext_if proto tcp all modulate state flags S/SA

pass out on $ext_if proto { udp,icmp } all keep state

我的home主机的pf.conf如下:

ext_if="rl1" # replace with actual external interface name i.e., dc0

int_if="rl0" # replace with actual internal interface name i.e., dc1

internal_net="192.168.0.0/24"

priv_nets="{

127.0.0.0/8,

192.168.0.0/16,

172.16.0.0/12,

10.0.0.0/8

}"

set optimization aggressive

scrub in all

nat on $ext_if from $internal_net to any -> 218.85.158.244/32

block all

pass quick on lo0 all

pass quick on tun0 all

pass in on $int_if from any to any keep state

pass out on $int_if from any to any keep state

block drop in quick on $ext_if from $priv_nets to any

block drop out quick on $ext_if from any to $priv_nets

pass out on $ext_if proto tcp all modulate state flags S/SA

pass out on $ext_if proto { udp,icmp } all keep state

重起office和home主机

#cd /etc/openvpn

#./openvpn-startup.sh

在局域网1 A client端 ping 局域网2 b client端

ping 192.168.0.45