sudo apt-get  install openswan

    安装过程中如问到: Use an X.509 certificate for this host, 回答NO.

   sudo mv /etc/sysctl.conf /etc/sysctl.conf.bak

    sudo vim /etc/sysctl.conf

    ———–输入如下内容————-

    net.ipv4.ip_forward = 1

    net.ipv4.conf.all.accept_redirects = 0

    net.ipv6.conf.all.accept_redirects = 0

    net.ipv4.conf.all.send_redirects = 0

1.2 加载sysctl参数

    sysctl  -p
sudo bash -c ‘for each in /proc/sys/net/ipv4/conf/*
do
echo 0 > $each/accept_redirects
echo 0 > $each/send_redirects
done
‘

   sudo mv  /etc/rc.local /etc/rc.local.bak
sudo vim /etc/rc.local
———–输入如下内容————-
#!/bin/sh -e
iptables -t nat -A POSTROUTING -s 10.1.1.0/24 -o eth0 -j MASQUERADE
exit 0

   #添加执行权限，运行配置
sudo chmod +x /etc/rc.local
sudo /etc/rc.local

   sudo mv /etc/ipsec.secrets  /etc/ipsec.secrets.bak
sudo vim /etc/ipsec.secrets
———–输入如下内容————-
# 将IP和密码换成服务器IP和设定的密码
111.222.333.444 %any: PSK “0123456” #此处密码为服务器的共享密钥，连接时时提供

1.5 配置ipsec.conf

    sudo mv   /etc/ipsec.conf /etc/ipsec.conf.bak
sudo vim  /etc/ipsec.conf
———–输入如下内容————-
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=111.222.333.444 #换成服务器ip
leftprotoport=17/1701
right=%any
rightprotoport=17/%any

   sudo update-rc.d ipsec defaults

2、安装xl2tpd

   sudo apt-get install xl2tpd

   sudo mv   /etc/xl2tpd/xl2tpd.conf  /etc/xl2tpd/xl2tpd.conf.bak
sudo vim /etc/xl2tpd/xl2tpd.conf
———–输入如下内容————-
[global]
ipsec saref = yes

[lns default]
ip range = 10.1.1.2-10.1.1.255
local ip = 10.1.1.1
refuse chap = yes
refuse pap = yes
require authentication = yes
ppp debug = yes
pppoptfile = /etc/ppp/options.xl2tpd
length bit = yes

   sudo mv /etc/ppp/options.xl2tpd /etc/ppp/options.xl2tpd.bak
sudo vim /etc/ppp/options.xl2tpd
———–输入如下内容————-
require-mschap-v2
ms-dns 8.8.8.8
ms-dns 8.8.4.4
asyncmap 0
auth
crtscts
lock
hide-password
modem
debug
name l2tpd
proxyarp
lcp-echo-interval 30
lcp-echo-failure 4

    sudo mv   /etc/ppp/chap-secrets  /etc/ppp/chap-secrets.bak
sudo vim  /etc/ppp/chap-secrets
———–输入如下内容————-
#user   server  password    ip
user1   l2tpd   123456      *
user2   l2tpd   123456      *

    sudo invoke-rc.d xl2tpd restart
sudo invoke-rc.d ipsec restart

   sudo ipsec verify

    出现如下信息：

    Checking your system to see if IPsec got installed and started correctly:

    Version check and ipsec on-path                                  [OK]

    Linux Openswan U2.6.28/K2.6.32.16-linode28 (netkey)

    Checking for IPsec support in kernel                             [OK]

    NETKEY detected, 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

    Checking for ‘ip’ command                                        [OK]

    Checking for ‘iptables’ command                                  [OK]

    Opportunistic Encryption Support                                [DISABLED]

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