六步搞定centos 6下l2tp + ipsec VPN服务器配置

近年来最累的一次折腾。有必要好好记录一下。跟了网上N个教程，有好几个都走不通。最后自己彻底整理了一次。把自己的经验和配置分享出来。

首先隆重感谢一下至今素未谋面的老熊，真是好人啊。06年的时候就在plesk服务器换ip的事上，帮了我好大的忙。没想到这次在我卡在第6步，最绝望的时候，这只熊的婀娜身影再一次出现在了我的生活中。还在漆黑的深夜中陪伴在我的身边。以下隆重公布一下他的QQ，造福广大网友！QQ: 499******* （后几位号码，为符合当地莫名其妙的“相关法规”，被系统自动屏蔽。。。）

其次要感谢老熊的同事，百忙中写好的防火墙规则，让我10分钟之内，就被兴奋得昏了头的我，给无情覆盖了。以至于下次人家重写之后，很自觉的在/root下给留了个备份。[emot]zan[/emot]

1. 先安装openswan

yum install -y ppp iptables make gcc gmp-devel xmlto bison flex xmlto libpcap-devel lsof
wget http://download.openswan.org/openswan/openswan-2.6.38.tar.gz
tar zxvf openswan-2.6.38.tar.gz
cd openswan-2.6.38
make programs install

gkp说“安装 openswan，记得别用2.6.26，宁可用2.6.24。他和xl2tpd存在严重兼容性bug”

2. 安装xl2tpd

在centos 6官方的yum源中，没有这个软件包。需要安装fedora的epel源。

rpm -Uvh http://mirrors.ustc.edu.cn/fedora/epel/6/x86_64/epel-release-6-7.noarch.rpm
#CentOS 5用这个地址：  rpm -Uvh http://mirrors.ustc.edu.cn/fedora/epel/5/i386/epel-release-5-4.noarch.rpm
yum install xl2tpd -y

如果上面这个安装地址如果不对了。参照这个fedora epel的faq页（https://fedoraproject.org/wiki/EPEL/FAQ/zh-cn#How_can_I_install_the_packages_from_the_EPEL_software_repository.3F）

安装其他一些linux软件源，参照这页：http://dingxuan.info/blog/post/repo-sources.php

编辑 /etc/ipsec.conf 注意$esojourn.org替换成你机器的ip。这个IP应该是你的公网IP，不是本机内网IP。

# /etc/ipsec.conf - Openswan IPsec configuration file

# This file:  /usr/local/share/doc/openswan/ipsec.conf-sample
#
# Manual:     ipsec.conf.5


version 2.0     # conforms to second version of ipsec.conf specification

# basic configuration
config setup
        # Do not set debug options to debug configuration issues!
        # plutodebug / klipsdebug = "all", "none" or a combation from below:
        # "raw crypt parsing emitting control klips pfkey natt x509 dpd private"
        # eg:
        # plutodebug="control parsing"
        # Again: only enable plutodebug or klipsdebug when asked by a developer
        #
        # enable to get logs per-peer
        # plutoopts="--perpeerlog"
        #


        # Enable core dumps (might require system changes, like ulimit -C)
        # This is required for abrtd to work properly
        # Note: incorrect SElinux policies might prevent pluto writing the core
        dumpdir=/var/run/pluto/
        #
        # NAT-TRAVERSAL support, see README.NAT-Traversal
        nat_traversal=yes
        # exclude networks used on server side by adding %v4:!a.b.c.0/24
        # It seems that T-Mobile in the US and Rogers/Fido in Canada are
        # using 25/8 as "private" address space on their 3G network.
        # This range has not been announced via BGP (at least upto 2010-12-21)
        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,%v6:fd00::/8,%v6:fe80::/10
        # OE is now off by default. Uncomment and change to on, to enable.
        oe=off
        # which IPsec stack to use. auto will try netkey, then klips then mast

        protostack=netkey
        #这里注释说可以用auto，但实际上不行。还得老老实实写netkey

        # Use this to log to a file, or disable logging on embedded systems (like openwrt)
        #plutostderrlog=/dev/null

# Add connections here

# sample VPN connection
# for more examples, see /etc/ipsec.d/examples/
#conn sample
#               # Left security gateway, subnet behind it, nexthop toward right.
#               left=10.0.0.1
#               leftsubnet=172.16.0.0/24
#               leftnexthop=10.22.33.44
#               # Right security gateway, subnet behind it, nexthop toward left.
#               right=10.12.12.1
#               rightsubnet=192.168.0.0/24
#               rightnexthop=10.101.102.103
#               # To authorize this connection, but not actually start it,
#               # at startup, uncomment this.
#               #auto=add

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=$esojourn.org  #这里写公网IP，没固定IP的就到花生壳弄个动态域名解析。
    leftid=$esojourn.org
    leftprotoport=17/1701
    right=%any

修改ipsec密钥

vi  /etc/ipsec.secrets

www.esojourn.org %any: PSK "myps"
#www.esojourn.org改成公网ip，没固定IP的，就到花生壳弄个动态域名解析。http://www.oray.com/peanuthull/
#myps改成密码

3. 修改/etc/sysctl.conf，开启路由功能

vi /etc/sysctl.conf

星云说：
将下面两项找到：

net.ipv4.ip_forward = 0
net.ipv4.conf.default.rp_filter = 1

改为：

net.ipv4.ip_forward = 1
net.ipv4.conf.default.rp_filter = 0

之后先让修改后的配置生效，再测试一下，

sysctl -p
service ipsec start
ipsec verify

如果行了就这样了，但实际上，我反复测试之后，干脆在sysctl.conf最下面，加了这一段。加好后别忘了再sysctl -p一下。

#added for xl2tpd
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

如果ipsec verify返回这样，就可以了。

Checking your system to see if IPsec got installed and started correctly:
Version check and ipsec on-path                                 [OK]
Linux Openswan U2.6.24/K2.6.32.16-linode28 (netkey)
Checking for IPsec support in kernel                            [OK]
NETKEY detected, testing for disabled ICMP send_redirects       [OK]
NETKEY detected, testing for disabled ICMP accept_redirects     [OK]
Checking for RSA private key (/etc/ipsec.secrets)               [OK]
Checking that pluto is running                                  [OK]
Pluto listening for IKE on udp 500                              [OK]
Pluto listening for NAT-T on udp 4500                           [OK]
Two or more interfaces found, checking IP forwarding            [OK]
Checking NAT and MASQUERADEing
Checking for 'ip' command                                       [OK]
Checking for 'iptables' command                                 [OK]
Opportunistic Encryption Support                                [DISABLED]

我的经验中，这里可能会出这么几个故障：
第一：

SAref kernel support                                           [N/A]

这样的话， /etc/xl2tpd/xl2tpd.conf这个文件里

[global]
ipsec saref = no

第二：

Two or more interfaces found, checking IP forwarding            [FAILED]
Checking NAT and MASQUERADEing                                  [OK]

ip转发检查失败。

Paul和Steve说：只要 cat /proc/sys/net/ipv4/ip_forward 返回结果是1就没事。这个我已经证实了。

第三：返回结果里，就没有Two or more interfaces found, checking IP forwarding和Checking NAT and MASQUERADEing这两项。碰上这个我也没办法了。重装了系统，又瞎折腾一通之后就好了。

[ 2012-7-6 ]
第四：更新加入一个新的情况

Checking for IPsec support in kernel                            [OK]
 SAref kernel support                                           [N/A]
 NETKEY:  Testing XFRM related proc values                      [OK]
        [OK]
        [FAILED]

  Please enable /proc/sys/net/core/xfrm_larval_drop
  or NETKEY will cause non-POSIX compliant long time-outs

Checking that pluto is running                                  [OK]

出这毛病，照着说明，

echo 1 > /proc/sys/net/core/xfrm_larval_drop
vi /etc/bashrc

然后把“echo 1 > /proc/sys/net/core/xfrm_larval_drop”这句加进去。以后每次开机自动执行一下。

4. 编辑 /etc/xl2tpd/xl2tpd.conf
vi /etc/xl2tpd/xl2tpd.conf

; This is a minimal sample xl2tpd configuration file for use
; with L2TP over IPsec.
;
; The idea is to provide an L2TP daemon to which remote Windows L2TP/IPsec
; clients connect. In this example, the internal (protected) network
; is 192.168.1.0/24.  A special IP range within this network is reserved
; for the remote clients: 192.168.1.128/25
; (i.e. 192.168.1.128 ... 192.168.1.254)
;
; The listen-addr parameter can be used if you want to bind the L2TP daemon
; to a specific IP address instead of to all interfaces. For instance,
; you could bind it to the interface of the internal LAN (e.g. 192.168.1.98
; in the example below). Yet another IP address (local ip, e.g. 192.168.1.99)
; will be used by xl2tpd as its address on pppX interfaces.

[global]
listen-addr = esojourn.org  
;这里写内网IP。或者加;注释掉也问题不大。
;
; requires openswan-2.5.18 or higher - Also does not yet work in combination
; with kernel mode l2tp as present in linux 2.6.23+
; ipsec saref = yes
ipsec saref = no
;这里一般都让写yes，但如果刚才你的ipsec verify中，有报SAref kernel support[N/A]的话，这里就写no。


; 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.
; ipsec refinfo = 30
;
; forceuserspace = yes
;
; debug tunnel = yes

[lns default]
ip range = 192.168.7.128-192.168.7.254
;这里写vpn client的ip段
local ip = 192.168.7.1

require chap = yes
refuse pap = yes
require authentication = yes
name = LinuxVPNserver
ppp debug = yes
pppoptfile = /etc/ppp/options.xl2tpd
length bit = yes

5. 修改 /etc/ppp/options.xl2tpd

vi /etc/ppp/options.xl2tpd

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

vi /etc/ppp/chap-secrets

#文件格式
# user server password ip
username * userpass * #改成你的用户名 密码

6. 最关键的iptables配置
做完上面这堆步骤之后，客户端建个连接就可以验证进入vpn主机了。但是无法访问内外网。我就是在这里卡了一个多星期。网上的资料，有的没说这一步。有的说了也没说全。我发个权威的吧。

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。

#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

最后

service xl2tpd restart
service iptables restart
chkconfig xl2tpd on
chkconfig iptables on
chkconfig ipsec on

《六步搞定centos 6下l2tp + ipsec VPN服务器配置》上有28条评论

  1. 请教博主一个问题，在配置l2tp vpn时，执行ipsec verify 这一步时提示-bash:：psec ：comand not found，这个该如何解决呢？

    回复

  4. 请问 如果vps 有两个ip连接vpn后显示的ip 为拨入时的ip应该怎么配置？按照以上的配置 貌似不能链接

    回复

  5. 请教：启动ipsec的时候会提示出错，但没有具体的出错信息，只是一行空行。
    # service ipsec start
    failed to start openswan IKE daemon – the following error occured:

    回复

  8. 博主，请教一个问题。执行过 xl2tpd -D 后出现如下代码正常么？正常的话为何 netstat -an 中没有监听 1701 呢
    /]# xl2tpd -D
    xl2tpd[12565]: IPsec SAref does not work with L2TP kernel mode yet, enabling forceuserspace=yes
    xl2tpd[12565]: setsockopt recvref[22]: Protocol not available
    xl2tpd[12565]: This binary does not support kernel L2TP.
    xl2tpd[12565]: xl2tpd version xl2tpd-1.2.4 started on 207-226-138-166.static.pccwglobal.net PID:12565
    xl2tpd[12565]: Written by Mark Spencer, Copyright (C) 1998, Adtran, Inc.
    xl2tpd[12565]: Forked by Scott Balmos and David Stipp, (C) 2001
    xl2tpd[12565]: Inherited by Jeff McAdams, (C) 2002
    xl2tpd[12565]: Forked again by Xelerance (www.xelerance.com) (C) 2006
    xl2tpd[12565]: Listening on IP address 0.0.0.0, port 1701

    回复

  9. 博主，你好，我按照你的教程配置之后 客户端是xp，vpn能连接但是查看/var/log/secure发现ipsec没有起到作用，这是什么情况？

    回复

  10. 这个是我的规则怎么就不好用呢?而且这个防火墙一关就可以联网。*filter:FORWARD ACCEPT [0:0]:INPUT ACCEPT [0:0]:RH-Firewall-1-INPUT – [0:0]:OUTPUT ACCEPT [0:0]-A INPUT -j RH-Firewall-1-INPUT-A FORWARD -j RH-Firewall-1-INPUT-A RH-Firewall-1-INPUT -i lo -j ACCEPT-A RH-Firewall-1-INPUT -i eth0 -j ACCEPT-A RH-Firewall-1-INPUT -p icmp –icmp-type any -j ACCEPT-A RH-Firewall-1-INPUT -p 50 -j ACCEPT-A RH-Firewall-1-INPUT -p 51 -j ACCEPT-A RH-Firewall-1-INPUT -p udp -d 224.0.0.251 –dport 5353 -j ACCEPT-A RH-Firewall-1-INPUT -p udp -m udp –dport 631 -j ACCEPT-A RH-Firewall-1-INPUT -p tcp -m tcp –dport 631 -j ACCEPT-A RH-Firewall-1-INPUT -m state –state ESTABLISHED,RELATED -j ACCEPT-A RH-Firewall-1-INPUT -p tcp -m state -m tcp –dport 10000 –state NEW -j ACCEPT-A RH-Firewall-1-INPUT -p tcp -m state -m tcp –dport 22 –state NEW -j ACCEPT-A INPUT -p udp -m state -m udp –dport 1701 –state NEW -j ACCEPT-A INPUT -p udp -m state -m udp –dport 500 –state NEW -j ACCEPT-A INPUT -p udp -m state -m udp –dport 4500 –state NEW -j ACCEPT-A RH-Firewall-1-INPUT -j REJECT –reject-with icmp-host-prohibited-A FORWARD -s 10.0.99.0/24 -j ACCEPT-A FORWARD -d 10.0.99.0/24 -j ACCEPTCOMMIT*mangle:FORWARD ACCEPT [0:0]:INPUT ACCEPT [0:0]:OUTPUT ACCEPT [0:0]:PREROUTING ACCEPT [0:0]:POSTROUTING ACCEPT [0:0]COMMIT*nat:OUTPUT ACCEPT [0:0]:PREROUTING ACCEPT [0:0]:POSTROUTING ACCEPT [0:0]-A POSTROUTING -s 10.0.99.0/24 -o eth0 -j MASQUERADECOMMIT# Completed

    回复

  11. 请教一下博主，这个试验的网络环境是什么样的呢，VPN服务器是放在内网下的吗，我按照这个做的，在内网可以连接成功，可是放到外网环境就连不上来，路由器上做了映射。

    回复

  12. 映射我也做了，做了映射后目的IP地址不是要变化的么，这样不是和NAT一样了，会不会有影响，现在的情况是WIN7连报809错误，是不是客户端不支持NAT穿越的原因呢，日志上也看不出什么，还有就是iptables,我看楼主的文章说是不开iptables也可以连上，我现在就连不上。希望楼主有时间能帮一下我，我的QQ：284693977，非常感谢您。

    回复

  16. [root@localhost openswan-2.6.38]# sysctl -pnet.ipv4.ip_forward = 1net.ipv4.conf.default.rp_filter = 0net.ipv4.conf.default.accept_source_route = 0kernel.sysrq = 0kernel.core_uses_pid = 1error: "net.bridge.bridge-nf-call-ip6tables" is an unknown keyerror: "net.bridge.bridge-nf-call-iptables" is an unknown keyerror: "net.bridge.bridge-nf-call-arptables" is an unknown keykernel.msgmnb = 65536kernel.msgmax = 65536kernel.shmmax = 4294967295kernel.shmall = 268435456[root@localhost openswan-2.6.38]# service ipsec startfailed to start openswan IKE daemon – the following error occured:can not load config '/etc/ipsec.conf': /etc/ipsec.conf:71: syntax error, unexpected STRING, expecting EOL [#▒▒▒▒д▒▒▒▒IP▒▒û▒̶▒IP▒ľ͵▒▒▒▒▒▒Ū▒▒̬▒▒▒▒▒▒▒][root@localhost openswan-2.6.38]#[root@localhost openswan-2.6.38]#[root@localhost openswan-2.6.38]# ipsec verifyChecking 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                            [FAILED] SAref kernel support                                           [N/A]Checking that pluto is running                                  [FAILED]  whack: Pluto is not running (no "/var/run/pluto/pluto.ctl")Checking for 'ip' command                                       [OK]Checking /bin/sh is not /bin/dash                               [OK]Checking for 'iptables' command                                 [OK]Opportunistic Encryption Support                                [DISABLED]  can not load config '/etc/ipsec.conf': /etc/ipsec.conf:71: syntax error, unexpected STRING, expecting EOL [#▒▒▒▒д▒▒▒▒IP▒▒û▒̶▒IP▒ľ͵▒▒▒▒▒▒Ū▒▒̬▒▒▒▒▒▒▒]

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  17. 配置成功后，iPhone可以成功连上vpn，但无法上网，服务器上也没有开防火墙。请问你碰到过这种情况么？谢谢

    回复

  18. 一步一步做到ipsec verify的时候得到的结果是
    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 [FAILED]
    SAref kernel support [N/A]
    Checking that pluto is running [OK]
    Pluto listening for IKE on udp 500 [FAILED]
    Pluto listening for NAT-T on udp 4500 [FAILED]
    Two or more interfaces found, checking IP forwarding [FAILED]
    Checking NAT and MASQUERADEing [OK]
    Checking for ‘ip’ command [OK]
    Checking /bin/sh is not /bin/dash [OK]
    Checking for ‘iptables’ command [OK]
    Opportunistic Encryption Support [DISABLED]

    查了好多资料，都没找到解决办法，怎么办好？

    回复

  19. [root@www openswan-2.6.38]# make install
    OBJDIR: OBJ.linux.x86_64
    (cd /root/openswan-2.6.38/OBJ.linux.x86_64 && OBJDIRTOP=/root/openswan-2.6.38/OBJ.linux.x86_64 OBJDIR=/root/openswan-2.6.38/OBJ.linux.x86_64 make install )
    make[1]: Entering directory `/root/openswan-2.6.38/OBJ.linux.x86_64′
    make[2]: Entering directory `/root/openswan-2.6.38/OBJ.linux.x86_64/lib’
    make[3]: Entering directory `/root/openswan-2.6.38/OBJ.linux.x86_64/lib/libopenswan’
    make[3]: Leaving directory `/root/openswan-2.6.38/OBJ.linux.x86_64/lib/libopenswan’
    make[3]: Entering directory `/root/openswan-2.6.38/OBJ.linux.x86_64/lib/libpluto’
    make[3]: Leaving directory `/root/openswan-2.6.38/OBJ.linux.x86_64/lib/libpluto’
    make[3]: Entering directory `/root/openswan-2.6.38/OBJ.linux.x86_64/lib/libcrypto’
    make[4]: Entering directory `/root/openswan-2.6.38/OBJ.linux.x86_64/lib/libcrypto/libaes’
    make[4]: Leaving directory `/root/openswan-2.6.38/OBJ.linux.x86_64/lib/libcrypto/libaes’
    make[4]: Entering directory `/root/openswan-2.6.38/OBJ.linux.x86_64/lib/libcrypto/libdes’
    make[4]: Leaving directory `/root/openswan-2.6.38/OBJ.linux.x86_64/lib/libcrypto/libdes’
    make[4]: Entering directory `/root/openswan-2.6.38/OBJ.linux.x86_64/lib/libcrypto/libmd5′
    make[4]: Leaving directory `/root/openswan-2.6.38/OBJ.linux.x86_64/lib/libcrypto/libmd5′
    make[4]: Entering directory `/root/openswan-2.6.38/OBJ.linux.x86_64/lib/libcrypto/libsha1′
    make[4]: Leaving directory `/root/openswan-2.6.38/OBJ.linux.x86_64/lib/libcrypto/libsha1′
    make[4]: Entering directory `/root/openswan-2.6.38/OBJ.linux.x86_64/lib/libcrypto/libsha2′
    make[4]: Leaving directory `/root/openswan-2.6.38/OBJ.linux.x86_64/lib/libcrypto/libsha2′
    make[4]: Entering directory `/root/openswan-2.6.38/OBJ.linux.x86_64/lib/libcrypto/libmd2′
    make[4]: Leaving directory `/root/openswan-2.6.38/OBJ.linux.x86_64/lib/libcrypto/libmd2′
    make[4]: Entering directory `/root/openswan-2.6.38/OBJ.linux.x86_64/lib/libcrypto/liboswcrypto’
    make[4]: Leaving directory `/root/openswan-2.6.38/OBJ.linux.x86_64/lib/libcrypto/liboswcrypto’
    make[3]: Leaving directory `/root/openswan-2.6.38/OBJ.linux.x86_64/lib/libcrypto’
    make[3]: Entering directory `/root/openswan-2.6.38/OBJ.linux.x86_64/lib/libwhack’
    make[3]: Leaving directory `/root/openswan-2.6.38/OBJ.linux.x86_64/lib/libwhack’
    make[3]: Entering directory `/root/openswan-2.6.38/OBJ.linux.x86_64/lib/libipsecconf’
    make[3]: Leaving directory `/root/openswan-2.6.38/OBJ.linux.x86_64/lib/libipsecconf’
    make[2]: Leaving directory `/root/openswan-2.6.38/OBJ.linux.x86_64/lib’
    make[2]: Entering directory `/root/openswan-2.6.38/OBJ.linux.x86_64/programs’
    make[3]: Entering directory `/root/openswan-2.6.38/OBJ.linux.x86_64/programs/proc’
    # remove any old vendor file installed previously
    make[3]: Leaving directory `/root/openswan-2.6.38/OBJ.linux.x86_64/programs/proc’
    make[3]: Entering directory `/root/openswan-2.6.38/OBJ.linux.x86_64/programs/pluto’
    mkdir -p /usr/local/libexec/ipsec /usr/local/lib/ipsec
    mkdir -p -m 755 /etc/ipsec.d
    mkdir -p -m 755 /etc/ipsec.d/cacerts
    mkdir -p -m 755 /etc/ipsec.d/aacerts
    mkdir -p -m 755 /etc/ipsec.d/ocspcerts
    mkdir -p -m 755 /etc/ipsec.d/certs
    mkdir -p -m 755 /etc/ipsec.d/crls
    mkdir -p -m 700 /etc/ipsec.d/private
    mkdir -p -m 700 /var/run/pluto
    install -b –suffix=.old pluto whack /usr/local/libexec/ipsec
    #install –mode=u+rxs,g+rx,o+rx –group=root -b –suffix=.old whackinit /usr/local/libexec/ipsec
    if true ; then install -b –suffix=.old _pluto_adns /usr/local/libexec/ipsec ; fi
    install /root/openswan-2.6.38/programs/pluto/pluto.8 /usr/local/man/man8/ipsec_pluto.8
    sh /root/openswan-2.6.38/packaging/utils/manlink /root/openswan-2.6.38/programs/pluto/pluto.8 | \
    while read from to ; \
    do \
    ln -s -f ipsec_$from /usr/local/man/man8/$to; \
    done
    install /root/openswan-2.6.38/programs/pluto/ipsec.secrets.5 /usr/local/man/man5
    sh /root/openswan-2.6.38/packaging/utils/manlink /root/openswan-2.6.38/programs/pluto/ipsec.secrets.5 | \
    while read from to ; \
    do \
    ln -s -f $from /usr/local/man/man5/$to; \
    done
    make[3]: Leaving directory `/root/openswan-2.6.38/OBJ.linux.x86_64/programs/pluto’
    info: addcon/Makefile: MAKECMDGOALS=”install”
    make[3]: Entering directory `/root/openswan-2.6.38/OBJ.linux.x86_64/programs/addconn’
    # remove any old vendor file installed previously
    make[3]: Leaving directory `/root/openswan-2.6.38/OBJ.linux.x86_64/programs/addconn’
    make[3]: Entering directory `/root/openswan-2.6.38/OBJ.linux.x86_64/programs/_confread’
    /usr/bin/xmlto man /root/openswan-2.6.38/programs/_confread/ipsec.conf.5.xml
    /usr/bin/xmlto: line 576: 23871 已杀死 “$XSLTPROC_PATH” $XSLTOPTS -o “$XSLT_PROCESSED” “$STYLESHEET” “$INPUT_FILE”
    make[3]: *** [ipsec.conf.5] 错误 1
    make[3]: Leaving directory `/root/openswan-2.6.38/OBJ.linux.x86_64/programs/_confread’
    make[2]: *** [install] 错误 1
    make[2]: Leaving directory `/root/openswan-2.6.38/OBJ.linux.x86_64/programs’
    make[1]: *** [install] 错误 1
    make[1]: Leaving directory `/root/openswan-2.6.38/OBJ.linux.x86_64′
    make: *** [install] 错误 2

    这是怎么回事？

    回复

  20. 卸载xmlto后，openswan－2.6.38终于可以正常安装了，但是ipsec verify 的时候提示我
    -bash: /usr/sbin/ipsec: 没有那个文件或目

    回复

  21. # ipsec verify
    Version check and ipsec on-path [OK]
    Linux Openswan U2.6.38/K3.9.3-x86_64-linode33 (netkey)
    Checking for IPsec support in kernel [OK]
    SAref kernel support [N/A]
    NETKEY: Testing XFRM related proc values [OK]
    [OK]
    [OK]
    Checking that pluto is running [FAILED]
    whack: Pluto is not running (no “/var/run/pluto/pluto.ctl”)
    Two or more interfaces found, checking IP forwarding [FAILED]
    whack: Pluto is not running (no “/var/run/pluto/pluto.ctl”)
    Checking NAT and MASQUERADEing [OK]
    Checking for ‘ip’ command [OK]
    Checking /bin/sh is not /bin/dash [OK]
    Checking for ‘iptables’ command [OK]
    Opportunistic Encryption Support [DISABLED]
    can not load config ‘/etc/ipsec.conf’: /etc/ipsec.conf:64: syntax error, unexpected STRING, expecting EOL [#这里写公网IP，没固定IP的就到花生壳弄个动态域名解析。]

    /etc/ipsec.conf 里面的 IP 公网 IP 已经写上了,但是就是这里通不过, orz.

    不知道是不是在执行 make programs install 出现下面的错误导致的.
    cc1: 错误：-Werror=cpp：没有选项 -Wcpp
    make[3]: *** [addrtoa.o] 错误 1
    make[3]: Leaving directory `/root/openswan-2.6.39/OBJ.linux.x86_64/lib/libopenswan’
    make[2]: *** [programs] 错误 1
    make[2]: Leaving directory `/root/openswan-2.6.39/OBJ.linux.x86_64/lib’
    make[1]: *** [programs] 错误 1
    make[1]: Leaving directory `/root/openswan-2.6.39/OBJ.linux.x86_64′
    make: *** [programs] 错误 2

    回复

    1. 貌似把/etc/ipsec.conf里那个注释语句被程序认为是配置文件的一部分了？
      “ #这里写公网IP，没固定IP的就到花生壳弄个动态域名解析。”

      这个整句删掉？

      回复

  22. 您好！首先谢谢您的分享，完全按您的教程（openswan版本号一致），只要不是用ipsec的共享密钥，就可以成功连接我自己搭建的l2tp，但是客户端一开启配置共享密钥就无法连接，windows，安卓也就好说了（不用密钥呗），苦于ios。。。跟本无法用，在围墙中苦苦挣扎。。。
    所以想请教下您：
    我的VPS上有一个防火墙，在防火墙上面我通过web界面开通了4500:tcp/udp,500:udp，1701：tcp/udp
    而Linux-server则是完全按照您的/etc/sysconfig/iptables中填写，各表都加载正常。
    /var/log/secure日志如下：
    Dec 3 14:48:11 i-hdkkd3bo pluto[907]: packet from 1.202.99.36:500: ignoring unknown Vendor ID payload [01528bbbc00696121849ab9a1c5b2a5100000001]
    Dec 3 14:48:11 i-hdkkd3bo pluto[907]: packet from 1.202.99.36:500: ignoring Vendor ID payload [MS NT5 ISAKMPOAKLEY 00000009]
    Dec 3 14:48:11 i-hdkkd3bo pluto[907]: packet from 1.202.99.36:500: received Vendor ID payload [RFC 3947] method set to=115
    Dec 3 14:48:11 i-hdkkd3bo pluto[907]: packet from 1.202.99.36:500: received Vendor ID payload [draft-ietf-ipsec-nat-t-ike-02_n] meth=106, but already using method 115
    Dec 3 14:48:11 i-hdkkd3bo pluto[907]: packet from 1.202.99.36:500: ignoring Vendor ID payload [FRAGMENTATION]
    Dec 3 14:48:11 i-hdkkd3bo pluto[907]: packet from 1.202.99.36:500: ignoring Vendor ID payload [MS-Negotiation Discovery Capable]
    Dec 3 14:48:11 i-hdkkd3bo pluto[907]: packet from 1.202.99.36:500: ignoring Vendor ID payload [Vid-Initial-Contact]
    Dec 3 14:48:11 i-hdkkd3bo pluto[907]: packet from 1.202.99.36:500: ignoring Vendor ID payload [IKE CGA version 1]
    Dec 3 14:48:11 i-hdkkd3bo pluto[907]: packet from 1.202.99.36:500: initial Main Mode message received on 10.81.14.45:500 but no connection has been authorized with policy=PSK
    Dec 3 14:48:12 i-hdkkd3bo pluto[907]: packet from 1.202.99.36:500: ignoring unknown Vendor ID payload [01528bbbc00696121849ab9a1c5b2a5100000001]
    Dec 3 14:48:12 i-hdkkd3bo pluto[907]: packet from 1.202.99.36:500: ignoring Vendor ID payload [MS NT5 ISAKMPOAKLEY 00000009]
    Dec 3 14:48:12 i-hdkkd3bo pluto[907]: packet from 1.202.99.36:500: received Vendor ID payload [RFC 3947] method set to=115
    Dec 3 14:48:12 i-hdkkd3bo pluto[907]: packet from 1.202.99.36:500: received Vendor ID payload [draft-ietf-ipsec-nat-t-ike-02_n] meth=106, but already using method 115
    Dec 3 14:48:12 i-hdkkd3bo pluto[907]: packet from 1.202.99.36:500: ignoring Vendor ID payload [FRAGMENTATION]
    Dec 3 14:48:12 i-hdkkd3bo pluto[907]: packet from 1.202.99.36:500: ignoring Vendor ID payload [MS-Negotiation Discovery Capable]
    Dec 3 14:48:12 i-hdkkd3bo pluto[907]: packet from 1.202.99.36:500: ignoring Vendor ID payload [Vid-Initial-Contact]
    Dec 3 14:48:12 i-hdkkd3bo pluto[907]: packet from 1.202.99.36:500: ignoring Vendor ID payload [IKE CGA version 1]
    Dec 3 14:48:12 i-hdkkd3bo pluto[907]: packet from 1.202.99.36:500: initial Main Mode message received on 10.81.14.45:500 but no connection has been authorized with policy=PSK

    ipsec verify：（这个应该没啥问题）
    Checking your system to see if IPsec got installed and started correctly:
    Version check and ipsec on-path [OK]
    Linux Openswan U2.6.38/K2.6.32-431.29.2.el6.x86_64 (netkey)
    Checking for IPsec support in kernel [OK]
    SAref kernel support [N/A]
    NETKEY: Testing XFRM related proc values [OK]
    [OK]
    [OK]
    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]

    sysctl -p：这个貌似也木问题
    net.ipv4.conf.default.accept_source_route = 0
    kernel.sysrq = 0
    kernel.core_uses_pid = 1
    net.ipv4.tcp_syncookies = 1
    error: “net.bridge.bridge-nf-call-ip6tables” is an unknown key
    error: “net.bridge.bridge-nf-call-iptables” is an unknown key
    error: “net.bridge.bridge-nf-call-arptables” is an unknown key
    kernel.msgmnb = 65536
    kernel.msgmax = 65536
    kernel.shmmax = 68719476736
    kernel.shmall = 4294967296
    fs.file-max = 65535
    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

    cat /etc/ipsec.conf
    # /etc/ipsec.conf – Openswan IPsec configuration file

    # This file: /usr/local/share/doc/openswan/ipsec.conf-sample
    #
    # Manual: ipsec.conf.5

    version 2.0 # conforms to second version of ipsec.conf specification

    # basic configuration
    config setup
    # Do not set debug options to debug configuration issues!
    # plutodebug / klipsdebug = “all”, “none” or a combation from below:
    # “raw crypt parsing emitting control klips pfkey natt x509 dpd private”
    # eg:
    # plutodebug=”control parsing”
    # Again: only enable plutodebug or klipsdebug when asked by a developer
    #
    # enable to get logs per-peer
    # plutoopts=”–perpeerlog”
    #
    # Enable core dumps (might require system changes, like ulimit -C)
    # This is required for abrtd to work properly
    # Note: incorrect SElinux policies might prevent pluto writing the core
    dumpdir=/var/run/pluto/
    #
    # NAT-TRAVERSAL support, see README.NAT-Traversal
    nat_traversal=yes
    # exclude networks used on server side by adding %v4:!a.b.c.0/24
    # It seems that T-Mobile in the US and Rogers/Fido in Canada are
    # using 25/8 as “private” address space on their 3G network.
    # This range has not been announced via BGP (at least upto 2010-12-21)
    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,%v6:fd00::/8,%v6:fe80::/10
    # OE is now off by default. Uncomment and change to on, to enable.
    oe=off
    # which IPsec stack to use. auto will try netkey, then klips then mast
    protostack=netkey
    # Use this to log to a file, or disable logging on embedded systems (like openwrt)
    #plutostderrlog=/dev/null

    # Add connections here

    # sample VPN connection
    # for more examples, see /etc/ipsec.d/examples/
    #conn sample
    # # Left security gateway, subnet behind it, nexthop toward right.
    # left=10.0.0.1
    # leftsubnet=172.16.0.0/24
    # leftnexthop=10.22.33.44
    # # Right security gateway, subnet behind it, nexthop toward left.
    # right=10.12.12.1
    # rightsubnet=192.168.0.0/24
    # rightnexthop=10.101.102.103
    # # To authorize this connection, but not actually start it,
    # # at startup, uncomment this.
    # #auto=add
    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=119.254.101.144
    leftid=119.254.101.144
    leftprotoport=17/1701
    right=%any
    rightprotoport=17/%any

    回复

    1. 我也要感谢您的留言。没想到这么多年了，还有人来。心里想起一句话，“fresh meat!”（如果您老到玩过diablo 1也许能明白。）

      抱歉，没精力仔细看了。根据您的描述，凭印象给建议个方向。iptables是难点。照抄八成不行，得花时间搞懂。

      回复

  23. # Generated by iptables-save v1.4.7 on Thu Dec 3 13:31:09 2015
    *nat
    :PREROUTING ACCEPT [0:0]
    :POSTROUTING ACCEPT [0:0]
    :OUTPUT ACCEPT [0:0]
    -A POSTROUTING -s 192.168.7.0/24 -o eth0 -j MASQUERADE
    COMMIT
    # Completed on Thu Dec 3 13:31:09 2015
    # Generated by iptables-save v1.4.7 on Thu Dec 3 13:31:09 2015
    *filter
    :INPUT ACCEPT [5:348]
    :FORWARD ACCEPT [0:0]
    :OUTPUT ACCEPT [5:592]
    -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 80 -j ACCEPT
    -A INPUT -p tcp -m state –state NEW -m tcp –dport 21 -j ACCEPT
    -A INPUT -p tcp -m state –state NEW -m tcp –dport 5277 -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
    COMMI

    这个是linux-server的iptables规则

    回复

    1. service ipsec status
      IPsec running – pluto pid: 5620
      pluto pid 5620
      No tunnels up
      。。。。。。。。。。。。。。。。。。。。。。。。
      -A INPUT -p udp -m state –state NEW -m tcp –dport 1701 -j ACCEPT

      回复

  24. 我次奥了，给你一百个攒
    就是少了这条网上都查不到
    iptables -I FORWARD -d 192.168.7.0/24 -j ACCEPT

    回复

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