CentOS 配置PPTP和L2TP服务器
IPSEC+L2TPD安装配置
1、安装OpenSwan
   # yum install openswan
配置/etc/ipsec.conf
内容如下:
version 2.0
config setup
    nat_traversal=yes
    virtual_private=%v4:10.0.0.0/8,%v4:192.168.0.0/16,%v4:172.16.0.0/12
    oe=off
    protostack=netkey
conn L2TP-PSK-NAT
    rightsubnet=vhost:%priv
    also=L2TP-PSK-noNAT
conn L2TP-PSK-noNAT
    authby=secret
    pfs=no
    auto=add
    keyingtries=3
    rekey=no
    ikelifetime=8h
    keylife=1h
    type=transport
    left=192.168.1.100
    leftprotoport=17/1701
    right=%any
    rightprotoport=17/%any
说明:192.168.1.100为VPN服务器外网IP
配置 PSK /etc/ipsec.secrets
内容如下:
    192.168.1.100 %any: PSK "pass"
配置包转发
 for i in /proc/sys/net/ipv4/conf/*
do
echo 0 > $i /accept_redirects
echo 0 > $i /send_redirects
   done
   echo 1 > /proc/sys/net/ipv4/ip_forward 
测试IPSEC是否成功
   # /etc/init.d/ipsec start
   # ipsec verify
Checking your system to see if IPsec got installed and started correctly:
Version check and ipsec on-path                                 [OK]
Linux Openswan U2.6.32/K2.6.18-194.8.1.el5 (netkey)
Checking for IPsec support in kernel                            [OK]
 SAref kernel support                                           [N/A]
 NETKEY:  Testing for disabled ICMP send_redirects              [OK]
NETKEY detected, testing for disabled ICMP accept_redirects     [OK]
Checking that pluto is running                                  [OK]
 Pluto listening for IKE on udp 500                             [OK]
 Pluto listening for NAT-T on udp 4500                          [OK]
Two or more interfaces found, checking IP forwarding            [OK]
Checking NAT and MASQUERADEing                                  [OK]
Checking for 'ip' command                                       [OK]
Checking /bin/sh is not /bin/dash                               [OK]
Checking for 'iptables' command                                 [OK]
Opportunistic Encryption Support                                [DISABLED]
无FAIL,则配置成功
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