当前位置: > Linux服务器 > VPN >

CentOS安装L2TP VPN笔记

时间:2016-06-01 22:05来源:xfeng.me 作者:xfeng.me

换了个新vps,之前一直用pptp和openvpn,这次准备尝试下l2tp,记录下安装过程

ip里也就能通过NCSetting快速启动vpn了,openvpn没有在NCSetting里的设置 
L2TP VPN
首先需要卸载已安装的openswan,我因为yum install安装的openswan版本有bug,导致我折腾一天也没连接成功,所以建议直接下载指定版本的源码编译安装

安装ipsec

1
2
3
4
5
yum remove -y openswan
wget http://www.openswan.org/download/openswan-2.6.24.tar.gz
tar zxvf openswan-2.6.24.tar.gz
cd openswan-2.6.24
make programs install

安装必须的模块

1
yum install ppp iptables libpcap-devel

配置ipsec

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
rm -rf /etc/ipsec.conf
touch /etc/ipsec.conf
cat >>/etc/ipsec.conf< <EOF
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=$ip  #替换成vps的ip
    leftprotoport=17/1701
    right=%any
    rightprotoport=17/%any
EOF

配置密钥

替换vipip和key

1
echo "$your_vps_ip %any: PSK \"$your_key\"" >/etc/ipsec.d/l2tp.secrets

配置转发

1
2
3
4
5
6
7
8
sed -i 's/net.ipv4.ip_forward = 0/net.ipv4.ip_forward = 1/g' /etc/sysctl.conf
sysctl -p
for each in /proc/sys/net/ipv4/conf/*                                                                                                      
do                                                                                                                                         
echo 0 > $each/accept_redirects                                                                                                            
echo 0 > $each/send_redirects                                                                                                              
done 
iptables -t nat -A POSTROUTING -j MASQUERADE

验证ipsec配置

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
/etc/init.d/ipsec restart                                                                                                                  
ipsec verify 
Checking your system to see if IPsec got installed and started correctly:
Version check and ipsec on-path                                 [OK]
Linux Openswan U2.6.24/K2.6.32-71.29.1.el6.i686 (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 for RSA private key (/etc/ipsec.secrets)               [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                                  [N/A]
Checking for 'ip' command                                       [OK]
Checking for 'iptables' command                                 [OK]
Opportunistic Encryption Support                                [DISABLED]

安装x2ltpd

1
2
3
4
5
6
wget http://www.xelerance.com/wp-content/uploads/software/xl2tpd/xl2tpd-1.3.0.tar.gz
tar xvf xl2tpd-1.3.0.tar.gz
make install
mkdir /var/run/xl2tpd
ln -s /usr/local/sbin/l2tp-control /var/run/xl2tpd/l2tp-control
mkdir /etc/xl2tpd

配置xl2tpd

修改/etc/xl2tpd/xl2tpd.conf 

1
2
3
4
5
6
7
8
9
10
11
12
[global]
listen-addr = $your_vps_ip #替换成你的vpsip
ipsec saref = yes
[lns default]
ip range = 192.168.30.10-192.168.30.20
local ip = 192.168.30.1
require chap = yes
refuse pap = yes
require authentication = yes
ppp debug = yes
pppoptfile = /etc/ppp/options.xl2tpd
length bit = yes

 

编辑 /etc/ppp/options.xl2tpd 

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
require-mschap-v2
ipcp-accept-local
ipcp-accept-remote
ms-dns  8.8.8.8
ms-dns  8.8.4.4
asyncmap 0
noccp
auth
crtscts
hide-password
debug
modem
lock
proxyarp
name l2tpd
lcp-echo-interval 30
lcp-echo-failure 4

 

配置用户和密码 /etc/ppp/chap-secrets 

1
2
3
# Secrets for authentication using CHAP
# client        server  secret                  IP addresses
name         l2tpd   password                *

 

配置转发规则

1
2
iptables -t nat -A POSTROUTING -s 192.168.30.0/24 -o eth0 -j MASQUERADE 
iptables -t nat -A POSTROUTING -s 192.168.30.0/24 -j SNAT --to-source $your_vps_ip

启动xl2tp

1
xl2tpd -D &

现在应该已经正常运行了,可以在你的手机或者电脑上新建一个l2tp连接测试

自启动配置

为了保证每次vps重启后都正常启动l2tp服务,我们还需做下面操作 

1
2
3
4
5
iptables-save > /etc/iptables
echo "iptables-restore /etc/iptables" >> /etc/rc.local
echo "/usr/local/sbin/xl2tpd -D &" >> /etc/rc.local
chkconfig --add ipsec
chkconfig --level 2345 ipsec on

 

参考文章: 
CentOS上L2TP安装与配置



(责任编辑:IT)
------分隔线----------------------------