首页 > Linux系统管理 > CentOS 下配置PPTP VPN客户端
2017
05-17

CentOS 下配置PPTP VPN客户端

安装pptp和pptp-setup
pptp就不用解释了,pptp-setup是一个设置脚本,通过该脚本可以使用方便地进行初始化设置,生成配置文件。

# yum install pptp pptp-setup
创建配置
# pptpsetup --create codelife --server vpn.codelife.me \
--username codelife --password me --encrypt
 
连接VPN
# pppd call codelife

验证连接情况

然后通过如下命令验证连接情况

# ip a |grep ppp

可以用 curl ifconfig.me 查看公网地址是否变了

关闭连接
注意:启动连接很简单,但停止不能使用ifconfig pp0 down,否则只是禁用了ppp0网卡,后台连接还是存在的。当然,可以杀进程(killall pppd)来断开连接。不过,ppp工具包提供了更好用的脚本。但需要您进行一些额外的工作:

# cp /usr/share/doc/ppp-2.4.5/scripts/pon /usr/sbin/
# cp /usr/share/doc/ppp-2.4.5/scripts/poff /usr/sbin/
# chmod +x /usr/sbin/pon
# chmod +x /usr/sbin/poff
然后使用下面的命令启动和关闭连接即可:
 
# pon vpn
# poff vpn
traceroute www.163.com
traceroute to www.163.com (101.23.128.17), 30 hops max, 60 byte packets
 1  localhost (192.168.1.1)  2.222 ms  3.144 ms  3.132 ms
 2  111.192.144.1 (111.192.144.1)  80.279 ms  80.632 ms  80.624 ms
 3  61.148.185.69 (61.148.185.69)  9.026 ms  9.492 ms  9.479 ms
 4  124.65.61.157 (124.65.61.157)  9.469 ms  9.459 ms  9.447 ms
 5  202.96.12.185 (202.96.12.185)  9.829 ms  9.783 ms  9.771 ms
 6  219.158.96.110 (219.158.96.110)  17.160 ms  17.210 ms  17.158 ms
 7  61.182.176.178 (61.182.176.178)  30.222 ms  28.589 ms  28.077 ms
 8  60.5.194.58 (60.5.194.58)  29.293 ms  29.287 ms  29.276 ms
 9  60.5.197.214 (60.5.197.214)  26.617 ms  26.724 ms  26.668 ms
10  101.23.255.45 (101.23.255.45)  27.672 ms  28.147 ms  26.811 ms
11  101.23.128.17 (101.23.128.17)  25.890 ms  28.065 ms  28.420 ms

发现虽然VPN已经连接成功,但是路由没有通过VPN上网,第1跳还是localhost (192.168.1.1)

再次查看网络连接配置

ifconfig
eth0      Link encap:Ethernet  HWaddr 08:00:27:90:e8:19
          inet addr:192.168.1.200  Bcast:192.168.1.255  Mask:255.255.255.0
          inet6 addr: fe80::a00:27ff:fe90:e819/64 Scope:Link
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:175 errors:0 dropped:0 overruns:0 frame:0
          TX packets:162 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000
          RX bytes:16817 (16.8 KB)  TX bytes:19723 (19.7 KB)
 
lo        Link encap:Local Loopback
          inet addr:127.0.0.1  Mask:255.0.0.0
          inet6 addr: ::1/128 Scope:Host
          UP LOOPBACK RUNNING  MTU:16436  Metric:1
          RX packets:0 errors:0 dropped:0 overruns:0 frame:0
          TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:0
          RX bytes:0 (0.0 B)  TX bytes:0 (0.0 B)
 
ppp0      Link encap:Point-to-Point Protocol
          inet addr:10.10.10.3  P-t-P:10.10.10.1  Mask:255.255.255.255
          UP POINTOPOINT RUNNING NOARP MULTICAST  MTU:1496  Metric:1
          RX packets:7 errors:0 dropped:0 overruns:0 frame:0
          TX packets:7 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:3
          RX bytes:70 (70.0 B)  TX bytes:76 (76.0 B)
 
~ route -n
Kernel IP routing table
Destination     Gateway         Genmask         Flags Metric Ref    Use Iface
0.0.0.0         192.168.1.1     0.0.0.0         UG    100    0        0 eth0
10.10.10.1      0.0.0.0         255.255.255.255 UH    0      0        0 ppp0
50.116.27.194   192.168.1.1     255.255.255.255 UGH   0      0        0 eth0
192.168.1.0     0.0.0.0         255.255.255.0   U     0      0        0 eth0
 
~ ip route
default via 192.168.1.1 dev eth0  metric 100
10.10.10.1 dev ppp0  proto kernel  scope link  src 10.10.10.3
50.116.27.194 via 192.168.1.1 dev eth0  src 192.168.1.200
192.168.1.0/24 dev eth0  proto kernel  scope link  src 192.168.1.200

发现默认路由是指向eth0。

下面修改路由配置:

#修改路由命令

~ sudo ip route del default 
~ sudo ip route add default dev ppp0
 
~ route -n
Kernel IP routing table
Destination     Gateway         Genmask         Flags Metric Ref    Use Iface
0.0.0.0         0.0.0.0         0.0.0.0         U     0      0        0 ppp0
10.10.10.1      0.0.0.0         255.255.255.255 UH    0      0        0 ppp0
50.116.27.194   192.168.1.1     255.255.255.255 UGH   0      0        0 eth0
192.168.1.0     0.0.0.0         255.255.255.0   U     0      0        0 eth0
 
~ ip route
default dev ppp0  scope link
10.10.10.1 dev ppp0  proto kernel  scope link  src 10.10.10.3
50.116.27.194 via 192.168.1.1 dev eth0  src 192.168.1.200
192.168.1.0/24 dev eth0  proto kernel  scope link  src 192.168.1.200
 
~ traceroute www.163.com
traceroute to www.163.com (101.23.128.17), 30 hops max, 60 byte packets
 1  localhost (10.10.10.1)  281.093 ms  281.414 ms  280.941 ms
 2  router2-dal.linode.com (67.18.7.162)  281.225 ms  281.109 ms  281.841 ms
 3  xe-2-0-0.car04.dllstx2.networklayer.com (67.18.7.93)  280.882 ms  284.002 ms  283.913 ms
 4  po102.dsr01.dllstx2.networklayer.com (70.87.254.81)  284.123 ms  284.087 ms  283.979 ms
 5  po21.dsr01.dllstx3.networklayer.com (70.87.255.65)  284.000 ms  283.921 ms  283.839 ms
 6  ae16.bbr01.eq01.dal03.networklayer.com (173.192.18.224)  283.542 ms  279.296 ms  290.455 ms
 7  dls-bb1-link.telia.net (213.248.102.173)  301.426 ms  302.092 ms  302.085 ms
 8  las-bb1-link.telia.net (213.155.131.77)  327.192 ms  327.350 ms  327.344 ms
 9  chinaunicom-ic-151188-las-bb1.telia.net (213.248.94.126)  478.941 ms  479.089 ms  479.083 ms
10  219.158.30.173 (219.158.30.173)  496.679 ms  496.673 ms  496.667 ms
11  219.158.97.57 (219.158.97.57)  516.819 ms  517.035 ms  517.011 ms
12  219.158.5.129 (219.158.5.129)  491.084 ms  490.018 ms  497.472 ms
13  219.158.100.130 (219.158.100.130)  518.239 ms  518.216 ms  518.192 ms
14  61.182.176.186 (61.182.176.186)  533.695 ms  533.673 ms  533.666 ms
15  101.23.255.230 (101.23.255.230)  512.212 ms  512.500 ms  512.479 ms
16  60.5.194.74 (60.5.194.74)  519.246 ms  519.815 ms  519.791 ms
17  101.23.255.45 (101.23.255.45)  526.522 ms  526.907 ms  526.844 ms
18  101.23.128.17 (101.23.128.17)  522.068 ms  517.535 ms  517.240 ms

查看第一跳,localhost (10.10.10.1),已经通过VPN实现路由。

停止VPN

~ sudo poff myvpn
 
~ ifconfig
eth0      Link encap:Ethernet  HWaddr 08:00:27:90:e8:19
          inet addr:192.168.1.200  Bcast:192.168.1.255  Mask:255.255.255.0
          inet6 addr: fe80::a00:27ff:fe90:e819/64 Scope:Link
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:2270 errors:0 dropped:0 overruns:0 frame:0
          TX packets:1991 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000
          RX bytes:207578 (207.5 KB)  TX bytes:184147 (184.1 KB)
 
lo        Link encap:Local Loopback
          inet addr:127.0.0.1  Mask:255.0.0.0
          inet6 addr: ::1/128 Scope:Host
          UP LOOPBACK RUNNING  MTU:16436  Metric:1
          RX packets:0 errors:0 dropped:0 overruns:0 frame:0
          TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:0
          RX bytes:0 (0.0 B)  TX bytes:0 (0.0 B)
 
再ping网站,发现网络出现问题。Network is unreachable
 
 
~ ping www.163.com
connect: Network is unreachable
 
~ route -n
Kernel IP routing table
Destination     Gateway         Genmask         Flags Metric Ref    Use Iface
50.116.27.194   192.168.1.1     255.255.255.255 UGH   0      0        0 eth0
192.168.1.0     0.0.0.0         255.255.255.0   U     0      0        0 eth0
 
~ ip route
50.116.27.194 via 192.168.1.1 dev eth0  src 192.168.1.200
192.168.1.0/24 dev eth0  proto kernel  scope link  src 192.168.1.200
重置路由
 
 
~ sudo ip route add default via 192.168.1.1
 
~ route -n
Kernel IP routing table
Destination     Gateway         Genmask         Flags Metric Ref    Use Iface
0.0.0.0         192.168.1.1     0.0.0.0         UG    0      0        0 eth0
50.116.27.194   192.168.1.1     255.255.255.255 UGH   0      0        0 eth0
192.168.1.0     0.0.0.0         255.255.255.0   U     0      0        0 eth0
 
~ ip route
default via 192.168.1.1 dev eth0
50.116.27.194 via 192.168.1.1 dev eth0  src 192.168.1.200
192.168.1.0/24 dev eth0  proto kernel  scope link  src 192.168.1.200

#再次ping网站,访问成功!

~ ping www.163.com
PING 163.xdwscache.glb0.lxdns.com (101.23.128.17) 56(84) bytes of data.
64 bytes from 101.23.128.17: icmp_req=1 ttl=54 time=25.6 ms
64 bytes from 101.23.128.17: icmp_req=2 ttl=54 time=25.5 ms
64 bytes from 101.23.128.17: icmp_req=3 ttl=54 time=27.8 ms

通过ip-up, ip-down配置路由

~ sudo vi /etc/ppp/ip-up.d/route-traffic
 
#!/bin/bash
/sbin/ip route add 50.116.27.194 via 192.168.1.1
/sbin/ip route del default
/sbin/ip route add default dev ppp0
 
~ sudo vi /etc/ppp/ip-down.d/disableroute
 
#!/bin/bash
/sbin/ip route add default via 192.168.1.1

重启VPN连接

~ sudo pon myvpn
#路由跟踪正确
~ traceroute www.163.com
traceroute to www.163.com (123.125.34.30), 30 hops max, 60 byte packets
 1  localhost (10.10.10.1)  293.397 ms  293.782 ms  293.668 ms
 2  router2-dal.linode.com (67.18.7.162)  293.530 ms  293.721 ms  294.223 ms
 3  xe-2-0-0.car04.dllstx2.networklayer.com (67.18.7.93)  293.454 ms  293.358 ms  293.239 ms
 4  po102.dsr02.dllstx2.networklayer.com (70.87.254.85)  293.749 ms  293.650 ms  293.544 ms
 5  po22.dsr02.dllstx3.networklayer.com (70.87.255.69)  293.444 ms  293.339 ms  293.242 ms
 6  ae17.bbr02.eq01.dal03.networklayer.com (173.192.18.230)  293.117 ms  293.525 ms  300.406 ms
 7  dls-bb1-link.telia.net (80.239.195.177)  300.850 ms  300.667 ms  300.320 ms
 
#正常退出
~ sudo poff myvpn
#测试网络连接正常
~ ping www.163.com
PING 163.xdwscache.glb0.lxdns.com (101.23.128.17) 56(84) bytes of data.
64 bytes from 101.23.128.17: icmp_req=1 ttl=54 time=28.2 ms
64 bytes from 101.23.128.17: icmp_req=2 ttl=54 time=28.1 ms

我做了个squid代理在上面

vim /etc/squid/squid.conf
http_port 3128
cache_mem 64 MB
maximum_object_size 4 MB
cache_dir ufs /var/spool/squid 100 16 256
access_log /var/log/squid/access.log
acl localnet src 192.168.0.0/16
http_access allow localnet
http_access allow all
visible_hostname squid.david.dev
cache_mgr 1111111g@qq.com

添加下防火墙规则

echo "1" >/proc/sys/net/ipv4/ip_forward
iptables -t nat -A PREROUTING -i eth0 -p tcp --dport 80 -j REDIRECT --to-ports 3128
iptables -t nat -A POSTROUTING -s 192.168.0.0/16 -o eth0 -j MASQUERADE
最后编辑:
作者:saunix
大型互联网公司linux系统运维攻城狮,专门担当消防员