废话不多说直接上步骤。
server
#epel仓库愿安装 rpm -ivh http://mirrors.ustc.edu.cn/fedora/epel/6/x86_64/epel-release-6-8.noarch.rpm #l2tp程序安装 yum install openswan ppp xl2tpd -y
vim /etc/ipsec.conf
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=192.168.42.191 #换成自己的公网ip，由于我这里测试所以是内网
leftprotoport=17/1701
right=%any
rightprotoport=17/%any
vim /etc/ipsec.secrets
192.168.42.191 %any: PSK "shiyiwen" #修改ip 和 密码
把如下添加进 /etc/sysctl.conf #注意顺序
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
sysctl -p 刷新
启动ipsec 和xl2tpd 应用
ipsec restart /etc/init.d/xl2tpd start chkconfig xl2tpd on chkconfig ipsec on
使用ipsec verify查看状态 （关闭selinux 和iptables 如果要开iptables 本文下面有全的）
enabled 没有管，因为后面也可以连接成功，内核参数也是设置对的。有知道的通知望告诉我。
/etc/xl2tpd/xl2tpd.conf 这里的配置文件可以配置分配的网段还有一些其他参数。默认可以不配置。
接下来配置ppp协议
vim /etc/ppp/chap-secrets #配置用户名和密码其实还有权限。
# Secrets for authentication using CHAP # client server secret IP addresses admin * "yingzi" *
重启xl2tpd 服务
===============================================================
client：
#安装epel源 #安装客户端l2tpd 这里我们还是用xl2tpd，当然2边都需要ppp协议 yum install xl2tpd ppp
vim /etc/xl2tpd/xl2tpd.conf
[lac sywvpn] name = admin; lns = 192.168.42.191; pppoptfile = /etc/ppp/peers/sywvpn.l2tpd; ppp debug = yes;
vim /etc/ppp/peers/sywvpn.l2tpd
#下面对应的参数是服务端配置过的
remotename sywvpn user "admin" password "yingzi" unit 0 lock nodeflate nobsdcomp noauth persist nopcomp noaccomp debug
#启动客户端
/etc/init.d/xl2tpd start
# 启动还没开始拨号。
开始拨号
echo 'c sywvpn' > /var/run/xl2tpd/l2tp-control
# 查看client拨号日志
Aug 31 15:38:59 app7 xl2tpd[3464]: Connecting to host 192.168.42.191, port 1701 Aug 31 15:38:59 app7 xl2tpd[3464]: Connection established to 192.168.42.191, 1701. Local: 52638, Remote: 44491 (ref=0/0). Aug 31 15:38:59 app7 xl2tpd[3464]: Calling on tunnel 52638 Aug 31 15:38:59 app7 xl2tpd[3464]: Call established with 192.168.42.191, Local: 28263, Remote: 3204, Serial: 2 (ref=0/0) Aug 31 15:38:59 app7 pppd[4629]: pppd 2.4.5 started by root, uid 0 Aug 31 15:38:59 app7 pppd[4629]: Using interface ppp0 Aug 31 15:38:59 app7 pppd[4629]: Connect: ppp0 <--> /dev/pts/2 Aug 31 15:39:02 app7 pppd[4629]: CHAP authentication succeeded: Access granted Aug 31 15:39:02 app7 pppd[4629]: CHAP authentication succeeded Aug 31 15:39:02 app7 pppd[4629]: local IP address 192.168.1.128 Aug 31 15:39:02 app7 pppd[4629]: remote IP address 192.168.1.99
#查看server端日志
Aug 31 15:38:41 Monitor xl2tpd[30013]: control_finish: Connection closed to 172.16.38.7, port 1701 (Goodbye!), Local: 63296, Remote: 51768 #之前断的 Aug 31 15:38:59 Monitor xl2tpd[30013]: Connection established to 172.16.38.7, 1701. Local: 44491, Remote: 52638 (ref=0/0). LNS session is 'default' Aug 31 15:38:59 Monitor xl2tpd[30013]: Call established with 172.16.38.7, Local: 3204, Remote: 28263, Serial: 2 Aug 31 15:38:59 Monitor pppd[30138]: pppd 2.4.5 started by root, uid 0 Aug 31 15:38:59 Monitor pppd[30138]: Using interface ppp0 Aug 31 15:38:59 Monitor pppd[30138]: Connect: ppp0 <--> /dev/pts/1 Aug 31 15:39:02 Monitor pppd[30138]: Cannot determine ethernet address for proxy ARP Aug 31 15:39:02 Monitor pppd[30138]: local IP address 192.168.1.99 Aug 31 15:39:02 Monitor pppd[30138]: remote IP address 192.168.1.128
#ifconfig 客户端
ppp0 Link encap:Point-to-Point Protocol
inet addr:192.168.1.128 P-t-P:192.168.1.99 Mask:255.255.255.255
UP POINTOPOINT RUNNING NOARP MULTICAST MTU:1410 Metric:1
RX packets:1341 errors:0 dropped:0 overruns:0 frame:0
TX packets:1341 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:3
RX bytes:112434 (109.7 KiB) TX bytes:112440 (109.8 KiB)
#ping 服务端
[root@app7 var]# ping 192.168.1.99 PING 192.168.1.99 (192.168.1.99) 56(84) bytes of data. 64 bytes from 192.168.1.99: icmp_seq=1 ttl=64 time=4.26 ms 64 bytes from 192.168.1.99: icmp_seq=2 ttl=64 time=4.01 ms 64 bytes from 192.168.1.99: icmp_seq=3 ttl=64 time=3.88 ms 64 bytes from 192.168.1.99: icmp_seq=4 ttl=64 time=3.91 ms 64 bytes from 192.168.1.99: icmp_seq=5 ttl=64 time=3.86 m
#断开拨号
echo 'd sywvpn' > /var/run/xl2tpd/l2tp-control
#查看该文件应该属于数据库过度文件
prw------- 1 root root 0 Aug 31 15:38 /var/run/xl2tpd/l2tp-control
# 网上解释如下
管道（FIFO，pipe）
用来解决多个程序同时访问一个文件所造成的错误问题，first-in-first-out(FIFO)，第一属性为（p）。
=================================================配置 iptables 来自网络======服务端的哦===========
iptables -t nat -A POSTROUTING -s 192.168.7.0/24 -o eth0 -j MASQUERADE
iptables -I FORWARD -s 192.168.7.0/24 -j ACCEPT
iptables -I FORWARD -d 192.168.7.0/24 -j ACCEPT
iptables-save
service iptables restart
192.168.7.0/24根据实际情况替换。
vi /etc/sysconfig/iptables 看到的应该是类似这样。
最上面先是nat规则，下面是filter规则。
下面filter表里，先把VPN要用到的udp端口1701，500，4500都打开。要用openvp的话，还要开1194。
另外filter表里，一定要有FORWARD规则。这点在网上好几个教程里都没说！坑死人。
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#下面规则做参考啊，新手别完全照抄。
*nat
:PREROUTING ACCEPT [39:3503]
:POSTROUTING ACCEPT [0:0]
:OUTPUT ACCEPT [0:0]
-A POSTROUTING -s 192.168.7.0/24 -o eth0 -j MASQUERADE
COMMIT
# Completed on Thu Jun 28 15:50:40 2012
# Generated by iptables-save v1.4.7 on Thu Jun 28 15:50:40 2012
*filter
:INPUT ACCEPT [0:0]
:FORWARD ACCEPT [0:0]
:OUTPUT ACCEPT [121:13264]
-A INPUT -m state --state RELATED,ESTABLISHED -j ACCEPT
-A INPUT -p icmp -j ACCEPT
-A INPUT -i lo -j ACCEPT
-A INPUT -p tcp -m state --state NEW -m tcp --dport 22 -j ACCEPT
-A INPUT -p tcp -m state --state NEW -m tcp --dport 80 -j ACCEPT
-A INPUT -p tcp -m state --state NEW -m tcp --dport 53 -j ACCEPT
-A INPUT -p udp -m state --state NEW -m udp --dport 53 -j ACCEPT
-A INPUT -p tcp -m state --state NEW -m tcp --dport 1194 -j ACCEPT
-A INPUT -p udp -m state --state NEW -m udp --dport 1701 -j ACCEPT
-A INPUT -p udp -m state --state NEW -m udp --dport 500 -j ACCEPT
-A INPUT -p udp -m state --state NEW -m udp --dport 4500 -j ACCEPT-A INPUT -j REJECT --reject-with icmp-host-prohibited
-A FORWARD -d 192.168.7.0/24 -j ACCEPT
-A FORWARD -s 192.168.7.0/24 -j ACCEPT
-A FORWARD -j REJECT --reject-with icmp-host-prohibited
COMMIT
# Completed on Thu Jun 28 15:50:40 2012
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by:V
