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redhat9.0 两块网卡 eth1接公网 61.131.58.x , eth0接 内网192.168.1.56 vpn 10.1.0.1 A主机 192.168.1.222 局域网2: HOME主机装redhat9.0两块网卡 eth0 接公网 218.85.158.244 eth1 接内网 192.168.0.235 vpn 10.1.0.2 B主机 192.168.0.45 环境:redhat9.0+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 先检查openssl是否已安装 rpm ?qa grep openssl 没有请先装openssl, openssl如何安装就不介绍了 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
[email protected]:/etc/openvpn office#cd /home/openvpn-2.0_beta7/sample-config-files office#cp static-office.conf /etc/openvpn office#cp firewall.sh /etc/openvpn office#cp openvpn-startup.sh /etc/openvpn office#cp office.up /etc/openvpn 修改static-office.conf ,firewall.sh ,openvpn-startup.sh,office.up 我们先来看office主机的这几个配置文件 static-office.conf配置如下: dev tun0 remote 218.85.158.244 #为对端的公网ip ifconfig 10.1.0.1 10.1.0.2 #为本端和对端的vpn ip地址 secret /etc/openvpn/static.key #密钥 port 5000 comp-lzo ping 15 ping 15 ping-restart 45 ping-timer-rem persist-tun persist-key verb 3 office主机的firewall.sh脚本如下: #!/bin/bash PRIVATE=192.168.1.0/24 LOOP=127.0.0.1 iptables -P OUTPUT DROP iptables -P INPUT DROP iptables -P FORWARD DROP iptables -F iptables -P OUTPUT ACCEPT iptables -P INPUT DROP iptables -P FORWARD DROP iptables -A INPUT -i eth1 -s $LOOP -j DROP iptables -A FORWARD -i eth1 -s $LOOP -j DROP iptables -A INPUT -i eth1 -d $LOOP -j DROP iptables -A FORWARD -i eth1 -d $LOOP -j DROP iptables -A FORWARD -p tcp --sport 137:139 -o eth1 -j DROP iptables -A FORWARD -p udp --sport 137:139 -o eth1 -j DROP iptables -A OUTPUT -p tcp --sport 137:139 -o eth1 -j DROP iptables -A OUTPUT -p udp --sport 137:139 -o eth1 -j DROP iptables -A FORWARD -s ! $PRIVATE -i eth0 -j DROP iptables -A INPUT -s $LOOP -j ACCEPT iptables -A INPUT -d $LOOP -j ACCEPT iptables -A INPUT -p icmp --icmp-type echo-request -j ACCEPT iptables -A INPUT -p tcp --dport http -j ACCEPT iptables -A INPUT -p tcp --dport ssh -j ACCEPT iptables -A INPUT -p udp --dport 5000 -j ACCEPT #openvpn默认使用udp 5000端口 iptables -A INPUT -i tun+ -j ACCEPT iptables -A FORWARD -i tun+ -j ACCEPT #这两句很重要 iptables -A INPUT -i tap+ -j ACCEPT iptables -A FORWARD -i tap+ -j ACCEPT iptables -A INPUT -i eth0 -j ACCEPT iptables -A FORWARD -i eth0 -j ACCEPT iptables -A OUTPUT -m state --state NEW -o eth1 -j ACCEPT iptables -A INPUT -m state --state ESTABLISHED,RELATED -j ACCEPT iptables -A FORWARD -m state --state NEW -o eth1 -j ACCEPT iptables -A FORWARD -m state --state ESTABLISHED,RELATED -j ACCEPT iptables -t nat -A POSTROUTING -s $PRIVATE -o eth1 -j MASQUERADE office.up脚本配置如下: #!/bin/bash route add -net 192.168.0.0 netmask 255.255.255.0 gw 10.1.0.2 #此处是对端的vpn ip地址 openvpn-startup.sh脚本配置如下: #!/bin/bash dir=/etc/openvpn $dir/firewall.sh modprobe tun echo 1 > /proc/sys/net/ipv4/ip_forward openvpn --config /etc/openvpn/static-office.conf home主机的4个配置文件 static-home.conf如下 dev tun0 remote 61.131.58.194 ifconfig 10.1.0.2 10.1.0.1 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 firewall.sh如下 #!/bin/bash PRIVATE=192.168.0.0/24 LOOP=127.0.0.1 iptables -P OUTPUT DROP iptables -P INPUT DROP iptables -P FORWARD DROP iptables -F iptables -P OUTPUT ACCEPT iptables -P INPUT DROP iptables -P FORWARD DROP iptables -A INPUT -i eth0 -s $LOOP -j DROP iptables -A FORWARD -i eth0 -s $LOOP -j DROP iptables -A INPUT -i eth0 -d $LOOP -j DROP iptables -A FORWARD -i eth0 -d $LOOP -j DROP iptables -A FORWARD -p tcp --sport 137:139 -o eth0 -j DROP iptables -A FORWARD -p udp --sport 137:139 -o eth0 -j DROP iptables -A OUTPUT -p tcp --sport 137:139 -o eth0 -j DROP iptables -A OUTPUT -p udp --sport 137:139 -o eth0 -j DROP iptables -A FORWARD -s ! $PRIVATE -i eth1 -j DROP iptables -A INPUT -s $LOOP -j ACCEPT iptables -A INPUT -d $LOOP -j ACCEPT iptables -A INPUT -p icmp --icmp-type echo-request -j ACCEPT iptables -A INPUT -p tcp --dport http -j ACCEPT iptables -A INPUT -p tcp --dport ssh -j ACCEPT iptables -A INPUT -p udp --dport 5000 -j ACCEPT iptables -A INPUT -i tun+ -j ACCEPT iptables -A FORWARD -i tun+ -j ACCEPT iptables -A INPUT -i tap+ -j ACCEPT iptables -A FORWARD -i tap+ -j ACCEPT iptables -A INPUT -i eth1 -j ACCEPT iptables -A FORWARD -i eth1 -j ACCEPT iptables -A OUTPUT -m state --state NEW -o eth0 -j ACCEPT iptables -A INPUT -m state --state ESTABLISHED,RELATED -j ACCEPT iptables -A FORWARD -m state --state NEW -o eth0 -j ACCEPT iptables -A FORWARD -m state --state ESTABLISHED,RELATED -j ACCEPT iptables -t nat -A POSTROUTING -s $PRIVATE -o eth0 -j MASQUERADE home.up脚本如下: #!/bin/bash route add -net 192.168.1.0 netmask 255.255.255.0 gw 10.1.0.1 openvpn-startup.sh脚本如下: #!/bin/bash dir=/etc/openvpn $dir/firewall.sh modprobe tun echo 1 > /proc/sys/net/ipv4/ip_forward openvpn --config /etc/openvpn/static-home.conf 最后需要注意的是在office和home主机的/etc/modules.conf都要加上一行: alias char-major-10-200 tun 在office主机上 office#cd /etc/openvpn office#./openvpn-startup.sh office#./office.up 在home主机上 home#cd /etc/openvpn home#./openvpn-startup.sh home#./home.up A主机的default gateway设为192.168.1.56 B主机的default gateway设为192.168.0.235 在A主机上ping 192.168.0.45 在home主机上用tcpdump监听 home#tcpdump -i tun0 应该有echo request和echo reply 不行的话，在home#ping 10.1.0.1看两个vpn网关是否通
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