strongSwan + xl2tpd VPN服务器:如何配置多个配置文件？

Question

我在Ubuntu 16.04上用strongSwan和xl2tpd设置了VPN服务器。配置之后，我尝试从iPad连接，但得到了如下错误：

Mar 26 02:22:13 myname-ubuntu-server charon: 01[NET] received packet: from 61.205.5.249[44919] to 192.168.193.3[500] (788 bytes)
Mar 26 02:22:13 myname-ubuntu-server charon: 01[ENC] parsed ID_PROT request 0 [ SA V V V V V V V V V V V V ]
Mar 26 02:22:13 myname-ubuntu-server charon: 01[IKE] received NAT-T (RFC 3947) vendor ID
Mar 26 02:22:13 myname-ubuntu-server charon: 01[IKE] received draft-ietf-ipsec-nat-t-ike vendor ID
Mar 26 02:22:13 myname-ubuntu-server charon: 01[IKE] received draft-ietf-ipsec-nat-t-ike-08 vendor ID
Mar 26 02:22:13 myname-ubuntu-server charon: 01[IKE] received draft-ietf-ipsec-nat-t-ike-07 vendor ID
Mar 26 02:22:13 myname-ubuntu-server charon: 01[IKE] received draft-ietf-ipsec-nat-t-ike-06 vendor ID
Mar 26 02:22:13 myname-ubuntu-server charon: 01[IKE] received draft-ietf-ipsec-nat-t-ike-05 vendor ID
Mar 26 02:22:13 myname-ubuntu-server charon: 01[IKE] received draft-ietf-ipsec-nat-t-ike-04 vendor ID
Mar 26 02:22:13 myname-ubuntu-server charon: 01[IKE] received draft-ietf-ipsec-nat-t-ike-03 vendor ID
Mar 26 02:22:13 myname-ubuntu-server charon: 01[IKE] received draft-ietf-ipsec-nat-t-ike-02 vendor ID
Mar 26 02:22:13 myname-ubuntu-server charon: 01[IKE] received draft-ietf-ipsec-nat-t-ike-02\n vendor ID
Mar 26 02:22:13 myname-ubuntu-server charon: 01[IKE] received FRAGMENTATION vendor ID
Mar 26 02:22:13 myname-ubuntu-server charon: 01[IKE] received DPD vendor ID
Mar 26 02:22:13 myname-ubuntu-server charon: 01[IKE] 61.205.5.249 is initiating a Main Mode IKE_SA
Mar 26 02:22:13 myname-ubuntu-server charon: 01[ENC] generating ID_PROT response 0 [ SA V V V ]
Mar 26 02:22:13 myname-ubuntu-server charon: 01[NET] sending packet: from 192.168.193.3[500] to 61.205.5.249[44919] (136 bytes)
Mar 26 02:22:13 myname-ubuntu-server charon: 10[NET] received packet: from 61.205.5.249[44919] to 192.168.193.3[500] (380 bytes)
Mar 26 02:22:13 myname-ubuntu-server charon: 10[ENC] parsed ID_PROT request 0 [ KE No NAT-D NAT-D ]
Mar 26 02:22:13 myname-ubuntu-server charon: 10[IKE] local host is behind NAT, sending keep alives
Mar 26 02:22:13 myname-ubuntu-server charon: 10[IKE] remote host is behind NAT
Mar 26 02:22:13 myname-ubuntu-server charon: 10[ENC] generating ID_PROT response 0 [ KE No NAT-D NAT-D ]
Mar 26 02:22:13 myname-ubuntu-server charon: 10[NET] sending packet: from 192.168.193.3[500] to 61.205.5.249[44919] (396 bytes)
Mar 26 02:22:13 myname-ubuntu-server charon: 06[NET] received packet: from 61.205.5.249[4500] to 192.168.193.3[4500] (108 bytes)
Mar 26 02:22:13 myname-ubuntu-server charon: 06[ENC] parsed ID_PROT request 0 [ ID HASH N(INITIAL_CONTACT) ]
Mar 26 02:22:13 myname-ubuntu-server charon: 06[CFG] looking for pre-shared key peer configs matching 192.168.193.3...61.205.5.249[100.75.130.131]
Mar 26 02:22:13 myname-ubuntu-server charon: 06[IKE] found 1 matching config, but none allows pre-shared key authentication using Main Mode
Mar 26 02:22:13 myname-ubuntu-server charon: 06[ENC] generating INFORMATIONAL_V1 request 2960834334 [ HASH N(AUTH_FAILED) ]
Mar 26 02:22:13 myname-ubuntu-server charon: 06[NET] sending packet: from 192.168.193.3[4500] to 61.205.5.249[4500] (108 bytes)

我认为这个错误的关键点是“找到一个匹配的配置，但是没有一个允许使用主模式的预共享密钥身份验证”。有人知道如何解决这个错误吗？

我找到了这个问题的答案，建议在/etc/ipsec.conf中添加"aggressiveness=yes“，并尝试了，但没有奏效.(也许我把"aggressiveness=yes“添加到一个错误的位置.我是Linux的初学者.)

我通过以下站点设置配置文件：http://qiita.com/namoshika/items/30c348b56474d422ef64 (对不起，它是用日语编写的.我认为您至少可以阅读代码部分)。

如果有人告诉我使用L2TP/IPsec在Ubuntu16.04上设置VPN服务器的可靠指令文件，我将不胜感激。

Answer 1

不要使用攻击模式，连接就不那么安全了。无论如何，尝试使用这种配置。我在我的VPN服务器上使用了强天鹅-5.3.5和xl2tpd-1.3.6

ipsec.conf

config setup
    cachecrls=yes
    uniqueids=yes
    charondebug=""

conn %default
    keyingtries=%forever
    dpddelay=30s
    dpdtimeout=120s


conn L2TP
    dpdaction=clear
    #Server IP
    left=192.168.1.130
    #Server default gateway
    leftnexthop=192.168.1.254
    leftprotoport=17/1701
    rightprotoport=17/%any
    right=%any
    rightsubnet=0.0.0.0/0
    leftauth=psk
    rightauth=psk
    leftid="<insert-the-public-ip-here>"
    ikelifetime=1h
    keylife=8h
    ike=aes128-sha1-modp1536,aes128-sha1-modp1024,aes128-md5-modp1536,aes128-md5-modp1024,3des-sha1-modp1536,3des-sha1-modp1024,3des-md5-modp1536,3des-md5-modp1024
    esp=aes128-sha1-modp1536,aes128-sha1-modp1024,aes128-md5-modp1536,aes128-md5-modp1024,3des-sha1-modp1536,3des-sha1-modp1024,3des-md5-modp1536,3des-md5-modp1024
    auto=add
    keyexchange=ike
    type=transport

conn block
    auto=ignore
conn private
    auto=ignore
conn private-or-clear
    auto=ignore
conn clear-or-private
    auto=ignore
conn clear
    auto=ignore
conn packetdefault
    auto=ignore

ipsec.secrets

<insert-the-left-id-here> %any : PSK "<my-password>"

/etc/xl2tpd/xl2tpd.conf

[global]
ipsec saref = no
debug tunnel = no
debug avp = no
debug network = no
debug state = no


[lns default]
ip range = 10.0.0.20-10.0.0.30
local ip = 10.0.0.1
require authentication = yes
name = l2tp
pass peer = yes
ppp debug = no
pppoptfile = /etc/ppp/options.xl2tpd
length bit = yes
unix authentication = yes

/etc/ppp/options.xl2tpd

ipcp-accept-local
ipcp-accept-remote
ms-dns 10.0.0.1
auth
idle 1800
mtu 1200
mru 1200
nodefaultroute
lock
proxyarp
connect-delay 5000
name l2tpd
ifname l2tp
login

/etc/ppp/CH章-机密

username    *   "l2tppassword"  *

重新启动服务

sudo service strongswan restart
sudo service xl2tpd restart