L2TP ipsec vpn是PPTP VPN的升级版，似乎是企业专用的。本文的方法在Chicagovps的xen上通过，并能成功联网，而且速度还不错。
环境：CentOS 6，且支持ppp
1、安装基础包
$ yum install -y ppp iptables make gcc gmp-devel xmlto bison flex xmlto libpcap-devel lsof vim-enhanced $ yum -y install nss-devel nspr-devel pkgconfig pam-devel libcap-ng-devel libselinux-devel curl-devel \ flex bison gcc make fipscheck-devel unbound-devel xmlto
2、下载安装openswan
#openswan is obsoleted by libreswan, trying to install libreswan-3.15-5.3.el6.x86_64 instead $ yum install libreswan ppp4 Comments