利用openbsd+openvpn快速建立企业vpn

利用openbsd+openvpn快速建立企业vpn
openvpn介绍http://openvpn.sourceforge.net/ ,不多说了.
openvpn可工作于两种模式：
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
拓扑图:
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
大功告成
openvpn主页http://openvpn.sourceforge.net 上还有howto，faq,examples可参考
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