1、检查服务器是否支持PPTP服务
[root@centos1 ~]# modprobe ppp-compress-18 && echo ok
ok
以上命令执行出来显示是“OK”的话，继续往下进行！
[root@centos1 ~]# cat /dev/net/tun
cat: /dev/net/tun: 文件描述符处于错误状态
以上命令执行出来显示报错的话，继续往下进行！

以上两条命令执行都通过，才能安装PPTP。

2、安装PPTP
[root@centos1 ~]# yum install ppp \输出的内容太多，我就不复制出来了
[root@centos1 ~]# rpm -i http://poptop.sourceforge.net/yum/stable/rhel6/pptp-release-current.noarch.rpm
[root@centos1 ~]# yum -y install pptpd
3、更改配置文件
找到“locapip”和“remoteip”这两个配置项，更改为你期望的IP段值。localip表示服务器的IP，remoteip表示分配给客户端的IP地址，可以设置为区间。这里我们使用pptp默认的配置：
localip 192.168.1.106
remoteip 192.168.1.20-200
编辑/etc/ppp/options.pptpd文件，添加DNS，一般只需要更改ms-dns就可以
ms-dns 8.8.8.8
ms-dns 8.8.4.4
二、PPTP的账号、密码配置
1、添加账号
需要编辑/etc/ppp/chap-secrets文件
[root@centos1 ~]# vim /etc/ppp/chap-secrets

Secrets for authentication using CHAP

clientserversecretIP addresses

machenximachenxi

client //用户账号，需要用双引号包含
server //代表自动识别当前服务器主机名，也可以手动配置
secret //用户密码，需要用双引号包含
IP address //代表自动分配可用的IP地址，可根据需要指定IP地址

除了上面编辑文件，还可以用命令来创建用
[root@centos1 ~]# vpnuser add jackware jackware
[root@centos1 ~]# cat /etc/ppp/chap-secrets \多了一个jackware的账号

Secrets for authentication using CHAP

clientserversecretIP addresses

machenximachenxi
jackwarejackware
[root@centos1 ~]# vpnuser del jackware
[root@centos1 ~]# cat /etc/ppp/chap-secrets \jackware的账号删除掉了

Secrets for authentication using CHAP

clientserversecretIP addresses

machenximachenxi

PPTPD配置ok，重启服务
[root@centos1 ~]# service pptpd restart
Shutting down pptpd: [确定]
Starting pptpd: [确定]
Warning: a pptpd restart does not terminate existing
connections, so new connections may be assigned the same IP
address and cause unexpected results. Use restart-kill to
destroy existing connections during a restart.
接下来到Windows机器上面做下验证吧。

这个时候ifconfig看一看网卡信息，是不是多出了一个ppp0的接口
[root@centos1 ppp]# ifconfig
eth0 Link encap:Ethernet HWaddr 00:0C:29:B5:3C:1C
inet addr:192.168.1.106 Bcast:192.168.1.255 Mask:255.255.255.0
inet6 addr: fe80::20c:29ff:feb5:3c1c/64 Scope:Link
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:8242 errors:0 dropped:0 overruns:0 frame:0
TX packets:5920 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:8299985 (7.9 MiB) TX bytes:650125 (634.8 KiB)

eth1 Link encap:Ethernet HWaddr 00:0C:29:B5:3C:26
inet addr:10.0.0.1 Bcast:10.255.255.255 Mask:255.0.0.0
inet6 addr: fe80::20c:29ff:feb5:3c26/64 Scope:Link
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:28 errors:0 dropped:0 overruns:0 frame:0
TX packets:23 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:6832 (6.6 KiB) TX bytes:3198 (3.1 KiB)

ppp0 Link encap:Point-to-Point Protocol
inet addr:192.168.1.106 P-t-P:192.168.1.20 Mask:255.255.255.255
UP POINTOPOINT RUNNING NOARP MULTICAST MTU:1396 Metric:1
RX packets:81 errors:0 dropped:0 overruns:0 frame:0
TX packets:29 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:3
RX bytes:7108 (6.9 KiB) TX bytes:4874 (4.7 KiB)

简单配置DHCP
1、安装DHCPD服务
yum -y install dhcp
2、配置/etc/dhcp.conf
#

DHCP Server Configuration file.

see /usr/share/doc/dhcp*/dhcpd.conf.sample

see ‘man 5 dhcpd.conf’

#
ddns-update-style interim;
ignore client-updates;

subnet 10.0.0.0 netmask 255.255.255.0 {
range 10.0.0.10 10.0.0.244;
option domain-name-servers ns.example.org;
option domain-name “machenxi.com”;
option routers 10.0.0.1;
option subnet-mask 255.255.255.0;
default-lease-time 600;
max-lease-time 7200;
host myhost {
}
}
3、编辑/etc/init.d/dhcpd将用户、用户组更改为root
user=root
group=root
4、重启dhcp
service dhcpd restart