centos安装配置pptp 虚拟专用网络服务器步骤分享
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服务器操作系统：CentOS 5.X 64位</p>
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服务器IP地址：192.168.21.128</p>
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实现目的：服务器安装配置pptp软件，对外提供虚拟专用网络拨号服务</p>
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具体操作：</p>
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一、安装包下载</p>
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1、ppp #安装pptpd需要此软件包</p>
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http://poptop.sourceforge.net/yum/stable/packages/ppp-2.4.4-14.1.rhel5.x86_64.rpm</p>
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2、pptpd #目前最新版本</p>
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http://poptop.sourceforge.net/yum/stable/packages/pptpd-1.4.0-1.rhel5.x86_64.rpm</p>
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下载好之后上传到/usr/local/src目录</p>
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二、检查服务器系统环境是否支持安装pptp 虚拟专用网络</p>
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1、检查系统内核是否支持MPPE补丁<br>
</p>
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<span><u>复制代码</u></span>
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<p>
代码如下:</p>
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modprobe ppp-compress-18 &&echo success</div>
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显示success说明系统支持MPPE补丁，如果不支持，需要先安装kernel-devel<br>
</p>
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<span><u>复制代码</u></span>
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<p>
代码如下:</p>
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<br>
yum install kernel-devel</div>
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</p>
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2、检查系统是否开启TUN/TAP支持</p>
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cat /dev/net/tun</p>
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如果这条指令显示结果为下面的文本，则表明通过：<br>
</p>
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<span><u>复制代码</u></span>
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<p>
代码如下:</p>
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cat: /dev/net/tun: File descriptor in bad state</div>
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3、检查系统是否开启ppp支持<br>
</p>
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<span><u>复制代码</u></span>
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<p>
代码如下:</p>
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cat /dev/ppp</div>
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如果这条指令显示结果为下面的文本，则表明通过：<br>
</p>
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<span><u>复制代码</u></span>
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<p>
代码如下:</p>
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cat: /dev/ppp: No such device or address</div>
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上面三条必须同时满足，否则不能安装pptp 虚拟专用网络</p>
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三、安装pptp<br>
</p>
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<span><u>复制代码</u></span>
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<p>
代码如下:</p>
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cd /usr/local/src<br>
rpm -ivh ppp-2.4.4-14.1.rhel5.x86_64.rpm #安装ppp<br>
rpm -ivh pptpd-1.4.0-1.rhel5.x86_64.rpm #安装pptp</div>
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四、配置pptp</p>
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1、vi /etc/ppp/options.pptpd #编辑，添加、修改以下参数<br>
</p>
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<span><u>复制代码</u></span>
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<p>
代码如下:</p>
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name pptpd<br>
refuse-pap<br>
refuse-chap<br>
refuse-mschap<br>
require-mschap-v2<br>
require-mppe-128<br>
proxyarp<br>
lock<br>
nobsdcomp<br>
novj<br>
novjccomp<br>
nologfd<br>
ms-dns 8.8.8.8 #添加主DNS服务器地址<br>
ms-dns 8.8.4.4 #添加备DNS服务器地址</div>
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:wq! #保存，退出</p>
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2、vi /etc/ppp/chap-secrets #设置pptp拨号用户和密码（可以设置多个用户，每行一个）<br>
</p>
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<span><u>复制代码</u></span>
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<p>
代码如下:</p>
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# client server secret IP addresses<br>
osyunwei虚拟专用网络user01 pptpd 123456 *<br>
osyunwei虚拟专用网络user02 pptpd 1234 *<br>
osyunwei虚拟专用网络user03 pptpd 12345678 *</div>
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格式：用户名 pptpd 密码 *</p>
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其中*表示为客户端自动分配IP地址</p>
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:wq! #保存，退出</p>
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3、vi /etc/pptpd.conf #设置pptp服务器IP地址，设置虚拟专用网络拨入客户端ip地址池<br>
</p>
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<span><u>复制代码</u></span>
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<p>
代码如下:</p>
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option /etc/ppp/options.pptpd<br>
logwtmp<br>
localip 172.16.36.1 #设置pptp虚拟拨号服务器IP地址（注意：不是服务器本身的IP地址）<br>
remoteip 172.16.36.2-254 #为拨入虚拟专用网络的用户动态分配172.16.36.2～172.16.36.254之间的IP地址</div>
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<span><u>复制代码</u></span>
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<p>
代码如下:</p>
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<br>
:wq! #保存，退出<br>
/sbin/service pptpd start #启动pptp<br>
/etc/init.d/pptpd stop #关闭<br>
service pptpd restart #重启<br>
chkconfig pptpd on #设置开机启动</div>
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五、开启服务器系统路由模式，支持包转发</p>
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编辑vi /etc/sysctl.conf <br>
</p>
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<span><u>复制代码</u></span>
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<p>
代码如下:</p>
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net.ipv4.ip_forward = 1 #设置为1<br>
#net.ipv4.tcp_syncookies = 1 #注释掉</div>
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</p>
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<span><u>复制代码</u></span>
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<p>
代码如下:</p>
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<br>
:wq! #保存，退出<br>
/sbin/sysctl -p #使设置立刻生效</div>
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<br>
六、设置防火墙转发规则<br>
</p>
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<span><u>复制代码</u></span>
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<p>
代码如下:</p>
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<br>
yum install iptables #安装防火墙<br>
service iptables start #启动防火墙<br>
iptables -t nat -A POSTROUTING -s 172.16.36.0/255.255.255.0 -j SNAT --to-source 192.168.21.128 #添加规则<br>
iptables -A FORWARD -p tcp --syn -s 172.16.36.0/255.255.255.0 -j TCPMSS --set-mss 1356 #添加规则<br>
/etc/init.d/iptables save #保存防火墙设置</div>
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七、开启pptp服务端口tcp 1723，设置虚拟专用网络拨入客户端ip地址池172.16.36.0/255.255.255.0通过防火墙</p>
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编辑vi /etc/sysconfig/iptables ，添加以下代码<br>
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<span><u>复制代码</u></span>
</div>
<p>
代码如下:</p>
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-A RH-Firewall-1-INPUT -p tcp -m state --state NEW -m tcp --dport 1723 -j ACCEPT</p> <p>-A RH-Firewall-1-INPUT -s 172.16.36.0/255.255.255.0 -j ACCEPT</div>
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:wq! #保存，退出</p>
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备注：<br><br>
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<span><u>复制代码</u></span>
</div>
<p>
代码如下:</p>
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<br>
#192.168.21.128为服务器IP地址<br>
#172.16.36.0/255.255.255.0是第四步中设置的pptp虚拟拨号服务器IP地址段<br>
/etc/init.d/iptables restart #重启防火墙<br>
chkconfig iptables on #设置开机启动<br>
cat /etc/sysconfig/iptables #查看防火墙配置文件<br>
# Generated by iptables-save v1.3.5 on Wed Dec 11 20:21:08 2013<br>
*nat<br>
: PREROUTING ACCEPT <br>
: POSTROUTING ACCEPT <br>
:OUTPUT ACCEPT <br>
-A POSTROUTING -s 172.16.36.0/255.255.255.0 -j SNAT --to-source 192.168.21.128<br>
COMMIT<br>
# Completed on Wed Dec 11 20:21:08 2013<br>
# Generated by iptables-save v1.3.5 on Wed Dec 11 20:21:08 2013<br>
*filter<br>
:INPUT ACCEPT <br>
:FORWARD ACCEPT <br>
:OUTPUT ACCEPT <br>
:RH-Firewall-1-INPUT - <br>
-A INPUT -j RH-Firewall-1-INPUT<br>
-A FORWARD -j RH-Firewall-1-INPUT<br>
-A FORWARD -s 172.16.36.0/255.255.255.0 -p tcp -m tcp --tcp-flags FIN,SYN,RST,ACK SYN -j TCPMSS --set-mss 1356<br>
-A RH-Firewall-1-INPUT -i lo -j ACCEPT<br>
-A RH-Firewall-1-INPUT -p icmp -m icmp --icmp-type any -j ACCEPT<br>
-A RH-Firewall-1-INPUT -p esp -j ACCEPT<br>
-A RH-Firewall-1-INPUT -p ah -j ACCEPT<br>
-A RH-Firewall-1-INPUT -d 224.0.0.251 -p udp -m udp --dport 5353 -j ACCEPT<br>
-A RH-Firewall-1-INPUT -p udp -m udp --dport 631 -j ACCEPT<br>
-A RH-Firewall-1-INPUT -p tcp -m tcp --dport 631 -j ACCEPT<br>
-A RH-Firewall-1-INPUT -m state --state RELATED,ESTABLISHED -j ACCEPT<br>
-A RH-Firewall-1-INPUT -p tcp -m state --state NEW -m tcp --dport 22 -j ACCEPT<br>
-A RH-Firewall-1-INPUT -p tcp -m state --state NEW -m tcp --dport 1723 -j ACCEPT<br>
-A RH-Firewall-1-INPUT -s 172.16.36.0/255.255.255.0 -j ACCEPT<br>
-A RH-Firewall-1-INPUT -j REJECT --reject-with icmp-host-prohibited<br>
COMMIT<br>
# Completed on Wed Dec 11 20:21:08 2013</div>
<p>
<br style='font-family: tahoma, arial, "Microsoft YaHei"; font-size: 14px;'><br style='font-family: tahoma, arial, "Microsoft YaHei"; font-size: 14px;'><span style='font-family: tahoma, arial, "Microsoft YaHei"; font-size: 14px;'>八、设置开机自动建立ppp设备节点（系统重新启动后有可能会丢失此文件，导致pptp客户端拨号出现错误619）</span></p>
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编辑vi /etc/rc.d/rc.local，在文件最后添加此行代码<br>
</p>
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<span><u>复制代码</u></span>
</div>
<p>
代码如下:</p>
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mknod /dev/ppp c 108 0 #在文件最后添加此行代码</div>
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<br style='font-family: tahoma, arial, "Microsoft YaHei"; font-size: 14px;'><span style='font-family: tahoma, arial, "Microsoft YaHei"; font-size: 14px;'>:wq! #保存，退出</span></p>
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