centos7 xl2tp vpn 服务器搭建

为了方便不在公司网络上网的个人用户能访问公司内网资源，需要搭建各种VPN服务器供使用，可通过在网络设备上配置pptp/l2tp/ipsec/ssl等协议的VPN，也可以通过在Windows server服务器上搭建各种VPN服务，比如sstp vpn,也可以在Linux服务器上搭建 pptp/l2tp/ipsec VPN，其中网络设备上SSL VPN和pptp协议的VPN在MAC电脑上的兼容性极差。

下面的案例以在Linux 上搭建xl2tpd/ipsec VPN

查看服务器是否支持pptp

# modprobe ppp-compress-18 && echo yes

返回结果为yes就表示通过

查看服务器是否开启了TUN，有的虚拟机主机需要开启

# cat /dev/net/tun && echo yes

返回结果为cat: /dev/net/tun: File descriptor in bad state就表示通过

安装EPEL源（CentOS7官方源中已经去掉了xl2tpd)

# yum install -y epel-release

安装xl2tpd和libreswan(openswan已经停止维护)

# yum install -y xl2tpd libreswan

编辑xl2tpd配置文件

# vi /etc/xl2tpd/xl2tpd.conf
[global]
listen-addr = 192.168.80.250
[lns default]
ip range = 192.168.1.128-192.168.1.135
local ip = 192.168.80.250
require chap = yes
refuse pap = yes
require authentication = yes
name = LinuxVPNserver
ppp debug = yes
pppoptfile = /etc/ppp/options.xl2tpd
length bit = yes

编辑xl2tpd ppp options file文件

# vi /etc/ppp/options.xl2tpd
name xl2tpd
require-mschap-v2
ipcp-accept-local
ipcp-accept-remote
ms-dns 202.106.0.20
ms-dns 8.8.4.4
#noccp
auth
idle 1800
mtu 1400
mru 1400
nodefaultroute
debug
proxyarp
refuse-pap
refuse-mschap
persist
lcp-echo-failure 4
lcp-echo-interval 30
connect-delay 5000
logfile /var/log/ppp/xl2tpd.log

编辑ipsec配置文件

vim /etc/ipsec.conf # 只修改以下项，其他默认
--------------------------------------------------------
config setup
protostack=netkey
dumpdir=/var/run/pluto/
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

include /etc/ipsec.d/*.conf
--------------------------------------------------------

8 编辑include的conn文件

# vi /etc/ipsec.conf
version 2.0

config setup
  virtual-private=%v4:10.0.0.0/8,%v4:192.168.0.0/16,%v4:172.16.0.0/12,%v4:!192.168.1.0/24,%v4:!192.168.43.0/24
  protostack=netkey
  interfaces=%defaultroute
  uniqueids=no

conn shared
  left=%defaultroute
  leftid=211.103.172.114
  right=%any
  encapsulation=yes
  authby=secret
  pfs=no
  rekey=no
  keyingtries=5
  dpddelay=30
  dpdtimeout=120
  dpdaction=clear
  ike=aes256-sha2,aes128-sha2,aes256-sha1,aes128-sha1,aes256-sha2;modp1024,aes128-sha1;modp1024
  phase2alg=aes_gcm-null,aes256-sha2_512,aes256-sha2,aes128-sha2,aes256-sha1,aes128-sha1
  sha2-truncbug=yes

conn l2tp-psk
  auto=add
  leftprotoport=17/1701
  rightprotoport=17/%any
  type=transport
  phase2=esp
  also=shared

conn xauth-psk
  auto=add
  leftsubnet=0.0.0.0/0
  rightaddresspool=192.168.1.128-192.168.1.135
  modecfgdns="202.106.0.20, 8.8.4.4"
  leftxauthserver=yes
  rightxauthclient=yes
  leftmodecfgserver=yes
  rightmodecfgclient=yes
  modecfgpull=yes
  xauthby=file
  ike-frag=yes
  ikev2=never
  cisco-unity=yes
  also=shared

设置用户名密码

# vi /etc/ppp/chap-secrets
# Secrets for authentication using CHAP
# client    server  secret          IP addresses
  user1     xl2tpd  p@9865321       *
  user2     xl2tpd  p@9865321       *

# 格式：用户名类型密码允许访问的ip
# 这个配置文件，也是pptpd的用户密码配置文件，直接类型上用*表示所有,因为这里我们只搭建l2tp/ipsec

设置预共享密钥PSK

# vi /etc/ipsec.d/ipsec.secrets
%any  %any  : PSK "K2hUWLpiGtDTdPMcezME"

自定义的PSK，客户端拨号连接时需要填写

CentOS7 防火墙设置

# firewall-cmd --permanent --add-service=ipsec
# firewall-cmd --permanent --add-port=1701/udp
# firewall-cmd --permanent --add-port=4500/udp 
# firewall-cmd --permanent --add-masquerade
# firewall-cmd --reload

修改内核参数

# vim /etc/sysctl.conf
net.ipv4.ip_forward = 1
net.ipv4.conf.all.accept_redirects = 0
net.ipv4.conf.all.rp_filter = 0
net.ipv4.conf.all.send_redirects = 0
net.ipv4.conf.default.accept_redirects = 0
net.ipv4.conf.default.rp_filter = 0
net.ipv4.conf.default.send_redirects = 0
net.ipv4.conf.ppp0.accept_redirects = 0
net.ipv4.conf.ppp0.rp_filter = 0
net.ipv4.conf.ppp0.send_redirects = 0

#sysctl -p

启动xl2tpd

# systemctl enable xl2tpd
# systemctl start xl2tpd
# syatemctl status xl2tpd

检查配置

# ipsec verify

启动ipsec

# systemctl enable ipsec
# systemctl start ipsec
# systemctl status ipsec

到此，服务端的搭建已经完成

centos7 xl2tp vpn 服务器搭建

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