手里有个LG p350手机，刷机后系统为2.3.7，始终无法vpn，无论是pptp还是openvpn，当然这还得怪我这个有洁癖，什么都喜欢用原生态，手机也是，非得刷原生态ROM，vpn也只喜欢用系统自带的。
好吧，少话废话，直接上android 2.x版本pptp vpn连接的上，却无法访问网络的的解决方法。原因就出在服务端的配置ppp-options文件上,直接注销“require-mppe-128”这个选项，然后在手机里去掉“启用加密”的勾选。OK，再看看，已经连接上，而且也能访问网络了。
如果是android 4.x，最后是把这项打开，手机上也选上“启用加密”。呵呵……
脚本网上找的，32位系统适用，内容如下
#! /bin/sh
#
### BEGIN INIT INFO
# Provides: pptpd instll
# PowerBY: fireye
# website: http//www.hichou.com www.qinday.com
# Description: pptpd install for centos vps
### END INIT INFO
#
yum remove -y pptpd ppp
iptables –flush POSTROUTING –table nat
iptables –flush FORWARD
rm -rf /etc/pptpd.conf
rm -rf /etc/ppp
wget http://packages.sw.be/dkms/dkms-2.1.1.2-1.el5.rf.noarch.rpm
wget “http://nchc.dl.sourceforge.net/project/poptop/mppe%20module%20builder/kernel_ppp_mppe-1.0.2%20dkms-2.0.6/kernel_ppp_mppe-1.0.2-3dkms.noarch.rpm”
wget http://www.diahosting.com/dload/pptpd-1.3.4-1.rhel5.1.i386.rpm
wget ftp://ftp.ntua.gr/pub/net/poptop/OldFiles/pptpd-1.1.3-1.i386.rpm
wget http://mirrors.163.com/centos/5.6/os/i386/CentOS/ppp-2.4.4-2.el5.i386.rpm
yum -y install make libpcap iptables gcc-c++ logrotate tar cpio perl pam tcp_wrappers
rpm -ivh dkms-2.1.1.2-1.el5.rf.noarch.rpm
rpm -ivh kernel_ppp_mppe-1.0.2-3dkms.noarch.rpm
rpm -qa kernel_ppp_mppe
rpm -Uvh ppp-2.4.4-2.el5.i386.rpm
rpm -ivh pptpd-1.3.4-1.rhel5.1.i386.rpm
mknod /dev/ppp c 108 0
echo 1 > /proc/sys/net/ipv4/ip_forward
echo “mknod /dev/ppp c 108 0″ >> /etc/rc.local
echo “echo 1 > /proc/sys/net/ipv4/ip_forward” >> /etc/rc.local
echo “localip 172.16.36.1″ >> /etc/pptpd.conf
echo “remoteip 172.16.36.2-254″ >> /etc/pptpd.conf
echo “ms-dns 8.8.8.8″ >> /etc/ppp/options.pptpd
echo “ms-dns 8.8.4.4″ >> /etc/ppp/options.pptpd
pass=`openssl rand 6 -base64`
if [ “$1” != “” ]
then pass=$1
fi
echo “vpn pptpd ${pass} *” >> /etc/ppp/chap-secrets
iptables -t nat -A POSTROUTING -s 172.16.36.0/24 -j SNAT –to-source `ifconfig | grep ‘inet addr:’| grep -v ’127.0.0.1′ | cut -d: -f2 | awk ‘NR==1 { print $1}’`
iptables -A FORWARD -p tcp –syn -s 172.16.36.0/24 -j TCPMSS –set-mss 1356
iptables -A RH-Firewall-1-INPUT -p tcp -m state –state NEW -m tcp –dport 1723 -j ACCEPT
iptables -A RH-Firewall-1-INPUT -p tcp -m state –state NEW -m tcp –dport 47 -j ACCEPT
service iptables save
chkconfig iptables on
chkconfig pptpd on
service iptables start
service pptpd restart
echo “VPN service is installed, your VPN username is vpn, VPN password is ${pass}”
VPN service is installed, your VPN username is vpn, VPN password is OBoyvanl