配置PPTP服务器

1、验证内核是否加载了MPPE模块：

modprobe ppp-compress-18 && echo MPPE is ok

2、安装所需的软件包：

yum -y install ppp

wget ftp://rpmfind.net/linux/epel/7/x86_64/p/pptpd-1.4.0-2.el7.x86_64.rpm

rpm -ivh pptpd-1.4.0-2.el7.x86_64.rpm

3、配置PPP和PPTP的配置文件：

grep ^[^#] /etc/ppp/options.pptpd

vi /etc/ppp/options.pptpd

name pptpd

#refuse-pap

#refuse-chap

#refuse-mschap

require-mschap-v2

require-mppe-128

ms-dns 8.8.8.8

ms-dns 8.8.4.4

proxyarp

lock

nobsdcomp

novj

novjccomp

nologfd

vi /etc/ppp/chap-secrets

username    pptpd    passwd    *

vi /etc/pptpd.conf

option /etc/ppp/options.pptpd

logwtmp

localip 192.168.0.1

remoteip 192.168.0.207-217

4、打开内核的IP转发功能：

vi /etc/sysctl.conf

net.ipv4.ip_forward = 1

/sbin/sysctl -p

5、配置防火墙和NAT转发

yum install iptables-services

systemctl stop firewalld.service

systemctl disable firewalld.service

systemctl enable iptables.service

systemctl start iptables.service

开启包转发：

iptables -t nat -A POSTROUTING -s 192.168.0.0/24 -o eno16777736 -j MASQUERADE

service iptables save

service iptables restart

开放端口和gre协议：

iptables -A INPUT -p tcp -m state --state NEW,RELATED,ESTABLISHED -m tcp --dport 1723 -j ACCEPT

iptables -A INPUT -p gre -m state --state NEW,RELATED,ESTABLISHED -j ACCEPT

iptables -t nat -A POSTROUTING -s 192.168.0.0/24 -o eno16777736 -j MASQUERADE

添加规则：

iptables -A INPUT -p gre -j ACCEPT

iptables -A INPUT -p tcp -m tcp --dport 1723 -j ACCEPT

iptables -A INPUT -m state --state RELATED,ESTABLISHED -j ACCEPT

iptables -A FORWARD -s 192.168.0.0/24 -o eno16777736 -j ACCEPT

iptables -A FORWARD -d 192.168.0.0/24 -i eno16777736 -j ACCEPT

iptables -t nat -A POSTROUTING -s 192.168.0.0/24 -o eno16777736 -j MASQUERADE

service iptables save

启动和查看服务：

systemctl start pptpd

systemctl enable pptpd

systemctl status pptpd

6.查看pptpd服务进程和端口：

#ps -ef | grep pptpd

root      25100      1  0 14:19 ?        00:00:00 /usr/sbin/pptpd -f

root      25463  24275  0 14:52 pts/0    00:00:00 grep --color=auto pptpd

# netstat -nutap | grep pptpd

tcp        0      0 0.0.0.0:1723            0.0.0.0:*               LISTEN      25100/pptpd