linux下安装pptpd来搭建vpn

    yum remove -y pptpd ppp
    iptables --flush POSTROUTING --table nat
    iptables --flush FORWARD
    rm -rf /etc/pptpd.conf
    rm -rf /etc/ppp

    wget http://www.diahosting.com/dload/dkms-2.0.17.5-1.noarch.rpm
    wget http://www.diahosting.com/dload/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 http://www.diahosting.com/dload/ppp-2.4.4-9.0.rhel5.i386.rpm

    yum -y install make libpcap iptables gcc-c++ logrotate tar cpio perl pam tcp_wrappers
    rpm -ivh dkms-2.0.17.5-1.noarch.rpm
    rpm -ivh kernel_ppp_mppe-1.0.2-3dkms.noarch.rpm
    rpm -qa kernel_ppp_mppe
    rpm -Uvh ppp-2.4.4-9.0.rhel5.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
    service iptables save

    chkconfig iptables on
    chkconfig pptpd on

    service iptables start
    service pptpd startecho "VPN service is installed, your VPN username is vpn, VPN password is ${pass}"

将以上脚本保存成pptpd.sh,然后运行就可以了

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