ubuntu pptpd setup

1.
    sudo apt-get install pptpd

2.修改/etc/pptpd.conf
    option /etc/ppp/pptpd-options
    logwtmp
    localip 192.168.0.1
    remoteip 192.168.0.2-3

3.修改/etc/ppp/pptpd-options
    name servername
    refuse-pap
    refuse-chap
    refuse-mschap
    require-mschap-v2
    require-mppe-128
    ms-dns 140.121.80.16
    proxyarp
    nodefaultroute
    lock
    nobsdcomp

4.修改/etc/ppp/chap-secrets
    # Secrets for authentication using CHAP
    # client    server      secret    IP addresses
    username    servername  passwd    *

5.
    sudo /etc/init.d/pptpd restart
    or
    sudo service pptpd restart

6.修改/etc/sysctl.conf
    find "＃net.ipv4.ip_forward=1" in file then delete #

7.
    sudo sysctl -p

8.
    sudo iptables -t nat -A POSTROUTING -s 192.168.0.0/16 -o eth0 -j MASQUERADE
    add "iptables -t nat -A POSTROUTING -s 192.168.0.0/16 -o eth0 -j MASQUERADE" to /etc/rc.local file