Centos 安装 L2tp
wget --no-check-certificate https://raw.githubusercontent.com/teddysun/across/master/l2tp.sh chmod x l2tp.sh ./l2tp.sh
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如果你要想对用户进行操作,可以使用如下命令:
l2tp -a 新增用户
l2tp -d 删除用户
l2tp -m 修改现有的用户的密码
l2tp -l 列出所有用户名和密码
l2tp -h 列出帮助信息
其他事项:
1、脚本在安装完成后,已自动启动进程,并加入了开机自启动。
2、脚本会改写 iptables 或 firewalld 的规则。
3、脚本安装时,会即时将安装日志写到 /root/l2tp.log 文件里,如果你安装失败,可以通过此文件来寻找错误信息。
使用命令:
ipsec status (查看 IPSec 运行状态)
ipsec verify (查看 IPSec 检查结果)
/etc/init.d/ipsec start|stop|restart|status (CentOS6 下使用)
/etc/init.d/xl2tpd start|stop|restart (CentOS6 下使用)
systemctl start|stop|restart|status ipsec (CentOS7 下使用)
systemctl start|stop|restart xl2tpd (CentOS7 下使用)
service ipsec start|stop|restart|status (Debian/Ubuntu 下使用)
service xl2tpd start|stop|restart (Debian/Ubuntu 下使用)
1.安装 l2tp ipsec 所需要的软件包
yum install epel-release
yum install openswan xl2tpd ppp lsof
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2.设置ipsec
2.1 编辑 /etc/ipsec.conf
vi /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
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2.2 编辑/etc/ipsec.secrets
vi /etc/ipsec.secrets
include /etc/ipsec.d/default.secrets
/etc/ipsec.secrets 文件里面默认有一句包含
/etc/ipsec.d/*.secrets
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的语句.所以可以直接在 /etc/ipsec.d 目录下新建一自己的个 default.secrets 文件.也可以直接把它注释掉,添加下面的配置语句.
vi /etc/ipsec.d/my.secrets
xxx.xxx.xxx.xxx %any: PSK 'kuaile'
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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,比如可以填csdn.net, 注意空格。
2.3 修改/添加 /etc/sysctl.conf
vi /etc/sysctl.conf
确保下面的字段都有,对应的值或下面一样。省事的话直接在/etc/sysctl.conf的末尾直接把下面内容的粘过去。
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
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2.4 让修改后的sysctl.conf生效
sysctl -p
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2.5 验证ipsec运行状态
ipsec setup start
ipsec verify
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verify的内容如下所示,那么就离成功不远了。没有 红色 的fail 就可以了.
Verifying installed system and configuration files Version check and ipsec on-path [OK] Libreswan 3.15 (netkey) on 3.10.0-123.9.3.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 [OK] 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]
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3. 设置 l2tp
3.1 编辑 /etc/xl2tpd/xl2tpd.conf
vim /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,;号是注释,和一般的配置文件不同
; Use refinfo of 22 if using an SAref kernel patch based on openswan 2.6.35 or
; when using any of the SAref kernel patches for kernels up to 2.6.35.
; saref refinfo = 30
;
force userspace = yes
;
; debug tunnel = yes
[lns default]
ip range = 10.0.10.2-10.0.10.100 ;这里是VPN client的内网ip地址范围
local ip = 10.0.10.1 ;这里是VPN server的内网地址
refuse chap = yes
refuse pap = yes
require authentication = yes
name = LinuxVPNserver
ppp debug = yes
pppoptfile = /etc/ppp/options.xl2tpd
length bit = yes
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3.2 编辑 /etc/ppp/options.xl2tpd
vi /etc/ppp/options.xl2tpd
name l2tpd require-mschap-v2 ms-dns 180.76.76.76 ms-dns 223.5.5.5 ms-dns 8.8.8.8 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
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3.3 配置用户名,密码:编辑 /etc/ppp/chap-secrets
vim /etc/ppp/chap-secrets
client和secret自己填,server和IP留号,l2tp 可以用上面自己设定的 l2tpd . 通用
# Secrets for authentication using CHAP
# client server secret IP addresses
ison * 123456 *
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3.4 启动xl2tp
service xl2tpd start
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4. 开放端口以及转发
原样执行下面所有命令
/sbin/iptables -A INPUT -p udp -m policy --dir in --pol ipsec -m udp --dport 1701 -j ACCEPT
/sbin/iptables -A INPUT -p udp -m udp --dport 1701 -j ACCEPT
/sbin/iptables -A INPUT -p udp -m udp --dport 500 -j ACCEPT
/sbin/iptables -A INPUT -p udp -m udp --dport 4500 -j ACCEPT
/sbin/iptables -A INPUT -p esp -j ACCEPT
/sbin/iptables -A INPUT -m policy --dir in --pol ipsec -j ACCEPT
/sbin/iptables -A FORWARD -d 10.0.10.0/24 -j ACCEPT
/sbin/iptables -A FORWARD -s 10.0.10.0/24 -j ACCEPT
/sbin/iptables -A FORWARD -i ppp -m state --state NEW,RELATED,ESTABLISHED -j ACCEPT
/sbin/iptables -A FORWARD -m state --state RELATED,ESTABLISHED -j ACCEPT
/sbin/iptables -t nat -A POSTROUTING -s 10.0.10.0/24 -o eth0 -j MASQUERADE
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再执行下面保存iptables
service iptables save service iptables restart
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添加开机自启动
systemd enabled ipsec
systemd enabled xl2tpd
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如果连接不上的话, 先关掉iptalbes试试 service iptables stop
如果这时还连不上了,那么就是iptables的问题了
特别注意iptables里的顺序, INPUT和FORWARD里的REJECT一定是写在最后面,否则写在他们之后的port就都被REJECT了!
下面是我自己的iptables,可供参考
#############
*nat :PREROUTING ACCEPT [3:160] :INPUT ACCEPT [3:160] :OUTPUT ACCEPT [3:180] :POSTROUTING ACCEPT [3:180] -A POSTROUTING -s 10.0.10.0/24 -o eth0 -j MASQUERADE COMMIT # Completed on Sat Mar 18 22:21:34 2017 # Generated by iptables-save v1.4.21 on Sat Mar 18 22:21:34 2017 *filter :INPUT ACCEPT [237:33515] :FORWARD ACCEPT [0:0] :OUTPUT ACCEPT [162:45870] -A INPUT -m state --state ESTABLISHED,RELATED -j ACCEPT -A INPUT -p icmp -j ACCEPT -A INPUT -i lo -j ACCEPT -A INPUT -m state --state NEW -m tcp -p tcp --dport 80 -j ACCEPT -A INPUT -m state --state NEW -m tcp -p tcp --dport 443 -j ACCEPT -A INPUT -m state --state NEW -m tcp -p tcp --dport 22 -j ACCEPT -A INPUT -p udp -m policy --dir in --pol ipsec -m udp --dport 1701 -j ACCEPT -A INPUT -p udp -m udp --dport 1701 -j ACCEPT -A INPUT -p udp -m udp --dport 500 -j ACCEPT -A INPUT -p udp -m udp --dport 4500 -j ACCEPT -A INPUT -p esp -j ACCEPT -A INPUT -m policy --dir in --pol ipsec -j ACCEPT -A FORWARD -d 10.0.10.0/24 -j ACCEPT -A FORWARD -s 10.0.10.0/24 -j ACCEPT -A FORWARD -i ppp -m state --state NEW,RELATED,ESTABLISHED -j ACCEPT -A FORWARD -m state --state RELATED,ESTABLISHED -j ACCEPT -A INPUT -j REJECT --reject-with icmp-host-prohibited -A FORWARD -j REJECT --reject-with icmp-host-prohibited COMMIT # Completed on Sat Mar 18 22:21:34 2017
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