PPTP-L2TP-PPPOE 配置详解

PPPOE

server

参考 http://laibulai.iteye.com/blog/1171898

  • 安装rp-pppoe:yum install rp-pppoe
  • 配置 /etc/ppp/pppoe-server-options,内容:
# PPP options for the PPPoE server
# LIC: GPL
require-pap
require-chap
login
lcp-echo-interval 10
lcp-echo-failure 2
logfile /var/log/pppoe.log

ms-dns 8.8.8.8
ms-dns 8.8.4.4
defaultroute
  • 添加用户名密码,/etc/ppp/chap-secrets:
    pppoe * "123456" *
  • 添加防火墙规则,做nat转换
iptables -A POSTROUTING -t nat -s 10.10.10.0/24 -j MASQUERADE
iptables -A FORWARD -p tcp --syn -s 10.10.10.0/24 -j TCPMSS --set-mss 1256
echo 1 > /proc/sys/net/ipv4/ip_forward
sysctl -w net.ipv4.ip_forward=1
  • 启动pppoe
pppoe-server -I eth0 -L 10.10.10.1 -R 10.10.10.100-200

client

参考 http://www.njust.edu.cn/web/Linux-PPPoE.pdf

注:client端也要配置pap,chap验证,否则拨号无法通过验证。(测试过windows client,linux client,没有测过client server在同一台机器的情况)

  1. 安装rp-pppoe客户端:yum install rp-pppoe
  2. adsl-setup,根据相关提示进行填写
  3. adsl-start,adsl-stop,pppoe-status

L2TP

server client都要验证ipsec服务,另外查看服务器iptables的reject有没有阻止,有的话删掉

server

参考http://lizhug.com/tech/centos6-5%E6%90%AD%E5%BB%BAl2tp-ipsec-vpn-vpn%E7%B3%BB%E5%88%97%EF%BC%88%E4%B8%80%EF%BC%89/

  • 添加包源,安装
rpm -Uvh http://dl.fedoraproject.org/pub/epel/6/i386/epel-release-6-8.noarch.rpm
yum install openswan ppp xl2tpd
  • 配置

<1>修改/etc/xl2tpd/xl2tpd.conf

[global]
listen-addr = 45.62.96.30   #改成自己本机的IP
ipsec saref = yes
[lns default]
ip range = 192.168.1.128-192.168.1.254    #分配的客户端IP
local ip = 192.168.1.1                 #本地IP  不用改
refuse chap = yes                     #改成refuse
refuse pap = yes
require authentication = yes
name = l2tp
ppp debug = yes
pppoptfile = /etc/ppp/options.xl2tpd
length bit = yes

<2>修改/etc/ppp/options.xl2tpd

ipcp-accept-local
ipcp-accept-remote
ms-dns 8.8.8.8
ms-dns 8.8.4.4
noccp
auth
crtscts
debug
hide-password
modem
lock
proxyarp

<3>修改/etc/ipsec.conf 在末尾添加(注:conn前面没有空格,其他行以tab空开)

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=45.62.96.30  #这边替换成你的本机IP
  leftprotoport=17/1701
  right=%any
  rightprotoport=17/%any

<4>添加/etc/ipsec.secrets 预定义密钥(注:PSK前面有空格)

vi /etc/ipsec.secrets
45.62.96.30     %any: PSK       "test1234"    #ip地址替换成你的本机ip

<5>设置网络策略(这个我也不懂),直接在终端输入

for each in /proc/sys/net/ipv4/conf/*
do
    echo 0 > $each/accept_redirects
    echo 0 > $each/send_redirects
done

<6> 创建账户文件

vi /etc/ppp/chap-secrets
里面格式为(如我的)
#用户名 * 密码 *
lizhug * 1234567890 *

<7>修改系统配置文件/etc/sysctl.conf 在结尾添加

net.ipv4.ip_forward = 1
net.ipv4.conf.default.rp_filter = 0
net.ipv4.conf.all.send_redirects = 0
net.ipv4.conf.default.send_redirects = 0
net.ipv4.conf.all.log_martians = 0
net.ipv4.conf.default.log_martians = 0
net.ipv4.conf.default.accept_source_route = 0
net.ipv4.conf.all.accept_redirects = 0
net.ipv4.conf.default.accept_redirects = 0
net.ipv4.icmp_ignore_bogus_error_responses = 1

执行 sysctl -p 使上面的设置生效

<8>修改防火墙设置,直接在终端执行

iptables -t nat -A POSTROUTING -o eth0 -j MASQUERADE
service iptables save
service iptables restart

<9>测试执行(注:这里遇到了faild initiallize nss database 的错误,通过更新nss-tools包成功:yum install nss-tools)

ipsec setup start
ipsec verify

出现如下提示就OK,如果出现了FAILED,直接粘贴google找修改方法

[root@default ~]# ipsec verify 
Checking your system to see if IPsec got installed and started correctly:
Version check and ipsec on-path [OK]
Linux Openswan U2.6.32/K(no kernel code presently loaded)
Checking for IPsec support in kernel [OK]
 SAref kernel support [N/A]
Checking that pluto is running [OK]
 Pluto listening for IKE on udp 500 [OK]
 Pluto listening for NAT-T on udp 4500 [OK]
Checking for 'ip' command [OK]
Checking /bin/sh is not /bin/dash [OK]
Checking for 'iptables' command [OK]
Opportunistic Encryption Support [DISABLED]

重启xl2tp
service xl2tpd restart
<10>开放端口以及转发参考:http://blog.csdn.net/musiccow/article/details/22904997 原样执行下面所有命令,

#Allow ipsec traffic
iptables -A INPUT -m policy --dir in --pol ipsec -j ACCEPT
iptables -A FORWARD -m policy --dir in --pol ipsec -j ACCEPT

#Do not NAT VPN traffic
iptables -t nat -A POSTROUTING -m policy --dir out --pol none -j MASQUERADE

#Forwarding rules for VPN
iptables -A FORWARD -i ppp+ -p all -m state --state NEW,ESTABLISHED,RELATED -j ACCEPT
iptables -A FORWARD -m state --state RELATED,ESTABLISHED -j ACCEPT

#Ports for Openswan / xl2tpd
iptables -A INPUT -m policy --dir in --pol ipsec -p udp --dport 1701 -j ACCEPT
iptables -A INPUT -p udp --dport 500 -j ACCEPT
iptables -A INPUT -p udp --dport 4500 -j ACCEPT
 
iptables -t nat -A POSTROUTING -s 192.168.1.0/24 -o eth0 -j MASQUERADE

再执行下面保存iptables

service iptables save
service iptables restart

<11>添加自启动

chkconfig xl2tpd on
chkconfig iptables on
chkconfig ipsec on

client

安装:

yum install xl2tpd
yum install ppp

配置/etc/xl2tpd/xl2tpd.conf

[lac testvpn(VPN名称)]
name = wufuqiang                                 ; l2tp帐号
lns = 192.168.20.10                                           ; l2tp server的IP
pppoptfile = /etc/ppp/peers/testvpn.l2tpd         ; pppd拨号时使用的配置文件
ppp debug = yes

vi /etc/ppp/peers/testvpn.l2tpd

remotename testvpn
user wufuqiang
password 1234567890
unit 0
lock
nodeflate
nobsdcomp
noauth
persist
nopcomp
noaccomp
maxfail 5
debug

配置文件都建好后,可以启动xl2tpd了,注意启动不代表拨号

运行方式1: 运行/etc/init.d/xl2tpd start即可,这种启动方式会自动去找/etc/xl2tpd/xl2tpd.conf这个配置文件,(每次修改xl2tpd.conf配置文件都要重启(restart)xl2tpd服务,重新加载配置文件方能成功!)
运行方式2:# xl2tpd -c "/your/config_file/path",如果使用此方法,要确保存在/var/run/xl2tpd/这个目录,其实看看/etc/init.d/xl2tpd这个文件也可以看出来,如果不存在,脚本会创建这个目录

开始拨号:

echo 'c testvpn' > /var/run/xl2tpd/l2tp-control

拨号成功的话,通过ifconfig可以看见有个ppp0的接口

断开连接:

echo 'd testvpn' > /var/run/xl2tpd/l2tp-control

启动xl2tpd到拨号,整个过程可查看日志

tail -f /var/log/message

PPTP

参考http://www.dabu.info/centos6-4-structures-pptp-vpn.html

server

检测

modprobe ppp-compress-18 && echo ok

安装ppp和iptables

yum install -y perl ppp iptables //centos默认安装了iptables和ppp  

版本要对。yum list installed ppp显示版本
ppp 2.4.4——————>pptpd 1.3.4
ppp 2.4.5——————>pptpd 1.4.0

安装pptpd

rpm -Uvh http://poptop.sourceforge.net/yum/stable/rhel6/pptp-release-current.noarch.rpm
yum install pptpd

修改配置/etc/ppp/options.pptpd,加入以下内容

ms-dns 8.8.8.8
ms-dns 8.8.4.4

配置文件/etc/ppp/chap-secrets

# Secrets for authentication using CHAP
# client server secret IP addresses
myusername pptpd mypassword *

myusername是你的vpn帐号,mypassword是你的vpn的密码,*表示对任何ip,记得不要丢了这个星号。我这里根据这个格式,假设我的vpn的帐号是ksharpdabu,密码是 sky。那么,应该如下:
ksharpdabu pptpd sky *
配置文件/etc/pptpd.conf, 添加下面两行:

localip 192.168.9.1
remoteip 192.168.9.11-30 //表示vpn客户端获得ip的范围

关键点:pptpd.conf这个配置文件必须保证最后是以空行结尾才行,否则会导致启动pptpd服务时,出现“Starting pptpd:”,一直卡着不动的问题,无法启动服务,切记呀! 配置文件/etc/sysctl.conf 将net.ipv4.ip_forward = 0 改成 net.ipv4.ip_forward = 1
保存修改后的文件

#/sbin/sysctl -p

启动pptp vpn服务和iptables

/sbin/service pptpd start 或者 #service pptpd start

client

参考https://linuxconfig.org/how-to-establish-pptp-vpn-client-connection-on-centos-rhel-7-linux

安装pptp yum install pptp pptp支持模块

#modprobe nf_conntrack_pptp ;

或者添加mppe模块:

modprobe ppp_mppe

配置 /etc/ppp/chap-secrets

admin  pptp password *

在/etc/ppp/peers/目录下创建linuxconfig文件,以下是内容

pty "pptp 192.168.20.10 --nolaunchpppd"
name wfqgtxvpn
remotename pptpd
require-mppe-128
file /etc/ppp/options.pptp
ipparam linuxconfig

连接

#pppd call linuxconfig

查看/var/log/messages 日志,分析错误

断开

pkill pppd