利用Openbsd和Openvpn快速建立企業的VPN

　　

利用openbsd+openvpn快速建立企業vpn

openvpn可工作於兩種模式：

一種是IP遂道路由模式,主要應用於點對點

一種是基於乙太網的遂道橋模式, 應用於點對多點,有多個分支機構

本文介紹的配置實例是第一種

 

區域網1:

OFFICE主機裝openbsd3.4 兩塊網卡

rl1接公網 61.131.58.x ,

rl0接 內網192.168.1.222

vpn 10.1.0.1

A client主機 192.168.1.22

 

區域網2:

HOME主機裝redhat9.0兩塊網卡

rl1 接公網 218.85.158.244

rl0 接內網 192.168.0.222

vpn 10.1.0.2

B client主機 192.168.0.45

 

環境:openbsd3.4+lzo+openssl+openvpn

openssl用來進行加密，lzo用來進行數據壓縮

下載地址 http://prdownloads.sourceforge.net/openvpn/openvpn-2.0_beta7.tar.gz

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

openbsd的安裝就不說了

openssl在openbsd下是默認安裝的

我將openvpn-2.0.beta7.tar.gz和lzo-1.08.tar.gz下載到/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

將static.key從office主機複製到home主機的/etc/openvpn目錄中

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

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

建立以下幾個配置文件及腳本文件

office.up和openvpn-startup.sh腳本

static-office.conf配置文件

我的office主機的配置例子如下

 

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主機的配置例子如下

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主機及home主機兩端起用pf防火牆,編輯/etc/sysctl.conf

net.inet.ip.forwarding=1

net.inet6.ip6.forwarding=1並去掉前面的#號

編輯/etc/rc.conf

pf=YES

我的office主機的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主機的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主機

#cd /etc/openvpn

#./openvpn-startup.sh

在區域網1 A client端 ping 區域網2 b client端

ping 192.168.0.45

（責任編輯：A6）

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