Centos 7安装L2TP/IPSEC vpn

一、安装l2tp ipsec所需要的软件包

yum install epel-release

yum install openswan xl2tpd ppp lsof

二、设置ipsec

a.编辑/etc/ipsec.conf(把下面xx.xxx.xxx.xxx换成你自己主机实际的外网固定IP。其他的不动。)

config setup protostack=netkey dumpdir=/var/run/pluto/ nat_traversal=yes virtual_private=%v4:10.0.0.0/8,%v4:192.168.0.0/16,%v4:172.16.0.0/12,%v4:25.0.0.0/8,%v4:100.64.0.0/10,%v6:fd00::/8,%v6:fe80::/10 conn L2TP-PSK-NAT rightsubnet=vhost:%priv also=L2TP-PSK-noNAT conn L2TP-PSK-noNAT authby=secret pfs=no auto=add keyingtries=3 dpddelay=30 dpdtimeout=120 dpdaction=clear rekey=no ikelifetime=8h keylife=1h type=transport left=xxx.xxx.xxx.xxx leftprotoport=17/1701 right=%any rightprotoport=17/%any

b.编辑/etc/ipsec.secrets

include /etc/ipsec.d/*.secrets xx.xxx.xxx.xxx %any: PSK "ZXkj8888"

xx.xxx.xxx.xxx换成你自己VPS实际的外网固定IP,YourPsk你自己定一个，到时候连VPN的时候用,就是预共享密钥，比如可以填csdn.net,注意空格。

c.修改/添加 /etc/sysctl.conf(sysctl -p)

net.ipv4.ip_forward = 1 net.ipv4.conf.default.accept_redirects = 0 net.ipv4.conf.default.send_redirects = 0 net.ipv4.conf.eth0.rp_filter = 0 net.ipv4.conf.default.rp_filter = 0 d.

e.验证ipsec运行状态

ipsec setup start ipsec verify [root@localhost ~]# ipsec setup start Redirecting to: systemctl start ipsec.service [root@localhost ~]# ipsec verify Verifying installed system and configuration files Version check and ipsec on-path [OK] Libreswan 3.15 (netkey) on 3.10.0-514.el7.x86_64 Checking for IPsec support in kernel [OK] NETKEY: Testing XFRM related proc values ICMP default/send_redirects [OK] ICMP default/accept_redirects [OK] XFRM larval drop [OK] Pluto ipsec.conf syntax [OK] Hardware random device [N/A] Two or more interfaces found,checking IP forwarding [OK] Checking rp_filter [ENABLED] /proc/sys/net/ipv4/conf/all/rp_filter [ENABLED] /proc/sys/net/ipv4/conf/ens160/rp_filter [ENABLED] /proc/sys/net/ipv4/conf/ip_vti0/rp_filter [ENABLED] rp_filter is not fully aware of IPsec and should be disabled Checking that pluto is running [OK] Pluto listening for IKE on udp 500 [OK] Pluto listening for IKE/NAT-T on udp 4500 [OK] Pluto ipsec.secret syntax [OK] Checking 'ip' command [OK] Checking 'iptables' command [OK] Checking 'prelink' command does not interfere with FIPSChecking for obsolete ipsec.conf options [OK] Opportunistic Encryption [DISABLED] ipsec verify: encountered 7 errors - see 'man ipsec_verify' for help

三、设置 l2tp

/etc/xl2tpd/xl2tpd.conf

[global] ipsec saref = yes listen-addr = xxx.xxx.xxx.xxx #这里是你的主机外网ip地址 [lns default] ip range = 10.60.10.235-10.60.10.240 local ip = 10.60.10.1 require chap = yes refuse pap = yes require authentication = yes name = LinuxVPNserver ppp debug = yes pppoptfile = /etc/ppp/options.xl2tpd length bit = yes

b.编辑/etc/ppp/options.xl2tpd

name l2tpd require-mschap-v2 ms-dns 8.8.8.8 ms-dns 8.8.4.4 ipcp-accept-local ipcp-accept-remote #ms-dns 8.8.8.8 noccp auth crtscts idle 1800 mtu 1410 mru 1410 nodefaultroute debug lock proxyarp connect-delay 5000

c.配置用户名密码:编辑 /etc/ppp/chap-secrets

# Secrets for authentication using CHAP # client server secret IP addresses "sun" * "123456" *

设置完成，使用windows测试是否正常连接，如下为win10设置：

四、防护墙设置

Chain IN_public_allow (1 references) target prot opt source destination ACCEPT tcp -- 0.0.0.0/0 0.0.0.0/0 tcp dpt:22 ctstate NEW ACCEPT udp -- 0.0.0.0/0 0.0.0.0/0 udp dpt:500 ctstate NEW ACCEPT udp -- 0.0.0.0/0 0.0.0.0/0 udp dpt:4500 ctstate NEW 十、ACCEPT ah -- 0.0.0.0/0 0.0.0.0/0 ctstate NEW 十一、 ACCEPT esp -- 0.0.0.0/0 0.0.0.0/0 ctstate NEW 十二、 ACCEPT udp -- 0.0.0.0/0 0.0.0.0/0 udp dpt:1701 ctstate NEW 十三、 ACCEPT tcp -- 0.0.0.0/0 0.0.0.0/0 tcp dpt:17328 ctstate NEW 十四、 ACCEPT udp -- 0.0.0.0/0 0.0.0.0/0 udp dpt:4500 ctstate NEW

上网设置

iptables -t nat -A POSTROUTING -s10.60.10.0/24 -j SNAT --to-source 45.77.133.69

firewall-cmd �Creload

十五、系统维护

启动方式：

systemctl start xl2tpd

systemctl status xl2tpd

systemctl start ipsec

systemctl status ipsec

原文：http://www.cnblogs.com/vijayfly/p/6762911.html