我的第一个问题：Ubuntu 是否支持 IPSEC/L2TP/PSK vpn CLIENT？
我的第二个问题：是否有支持 IPSEC/L2TP 和 PSK 的前端“网络管理器”？
背景：
在我的努力中我偶然发现了这篇文章：https://bugs.launchpad.net/ubuntu/+source/network-manager/+bug/264691- 我已尝试使用其中的建议 - 但仍然无法建立有效的 IPSEC/L2TP/PSK 隧道，因为它引用了 openswan。
背景：
我之前使用过 Werner Jaeger ipsec 客户端，它运行完美——大约 3 或 4 个月前它停止工作了。我尝试使用 Ubuntu Studio 14.04 和 Debian 8 在我的桌面上重新安装它，结果是一样的。
我现在知道 openswan 已从发行版中删除并被 strongswan 取代。我非常不想离开 linux，因为我的工作之一是在家工作，需要 vpn 来监控/测试/配置网络。有人能给我一个关于如何将其配置为客户端的好教程吗？
边注：
我找到了这个主题Ubuntu 14.10 上的 L2TP IPsec VPN 客户端- 尝试了里面的所有方法 - 仍然没有结果 - 而且那篇文章没有回答这个问题，因为它适用于 14.10，而我使用的是 14.04，它在技术上是不同的 - 到目前为止，我已经做了很多事情来让它工作，但都没有任何帮助。任何帮助都将不胜感激！！！
抱歉在这里发这样的帖子 - 说真的 - 我迫切希望它能正常工作，但已经筋疲力尽了 - 我已经 3 个月没能在我的桌面上工作了。我所做的所有研究都让我相信 Open Swan 不再起作用，我必须使用 Strongswan。（我错了吗？）
我一直在尝试做的一些事情 -
我尝试使用 strongswan 来执行以下操作：
apt-get install strongswan network-manager-strongswan
据我了解，我应该在网络管理器中看到 L2TP/IPSEC 选项。（我错了吗？）
问题是，在安装并重新启动后，网络管理器中不再存在 l2tp/ipsec/psk 选项
另外，进入 strongswan 后，Werner Jaeger 小程序消失了，这是预料之中的吗？
我接下来尝试做的事情是 -
我将我的机器回滚到 openswan，几个月来它第一次连接上了 - 尽管几秒钟后就断线了 - 我想我运行“ipsec verify”来检查状态 - 下面是我的步骤和我的日志减去敏感细节 - 任何想法都将不胜感激
我安装时用到的东西 -
sudo apt-get install openswan
sudo apt-get install xl2tpd
sudo apt-get install l2tp-ipsec-vpn
然后我配置了 GUI 小程序
然后我配置了文件：
/etc/ppp/watevs.options.xl2tpd
-日志-
jason@casa-wesella:~$ sudo ipsec verify
Checking your system to see if IPsec got installed and started correctly:
Version check and ipsec on-path [OK]
Linux Openswan U2.6.38/K3.16.0-43-lowlatency (netkey)
Checking for IPsec support in kernel [OK]
SAref kernel support [N/A]
NETKEY: Testing XFRM related proc values [FAILED]
Please disable /proc/sys/net/ipv4/conf/*/send_redirects
or NETKEY will cause the sending of bogus ICMP redirects! [FAILED]
Please disable /proc/sys/net/ipv4/conf/*/accept_redirects
or NETKEY will accept bogus ICMP redirects! [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 Checking NAT and MASQUERADEing [OK]
Checking for 'ip' command [OK]
Checking /bin/sh is not /bin/dash [WARNING]
Checking for 'iptables' command [OK]
Opportunistic Encryption Support [DISABLED]
> Logs from applet -
Jul 21 15:23:45.505 ipsec_setup: Starting Openswan IPsec U2.6.38/K3.16.0-43-lowlatency...
Jul 21 15:23:46.412 ipsec__plutorun: Starting Pluto subsystem...
Jul 21 15:23:46.659 ipsec__plutorun: adjusting ipsec.d to /etc/ipsec.d
Jul 21 15:23:46.749 recvref[30]: Protocol not available
Jul 21 15:23:46.749 xl2tpd[2313]: This binary does not support kernel L2TP.
Jul 21 15:23:46.749 xl2tpd[2316]: xl2tpd version xl2tpd-1.3.6 started on casa-wesella PID:2316
Jul 21 15:23:46.750 xl2tpd[2316]: Written by Mark Spencer, Copyright (C)
1998, Adtran, Inc.
Jul 21 15:23:46.750 xl2tpd[2316]: Forked by Scott Balmos and David Stipp, (C) 2001
Jul 21 15:23:46.750 xl2tpd[2316]: Inherited by Jeff McAdams, (C) 2002
Jul 21 15:23:46.750 xl2tpd[2316]: Forked again by Xelerance (www.xelerance.com) (C) 2006
Jul 21 15:23:46.751 xl2tpd[2316]: Listening on IP address 0.0.0.0, port 1701
Jul 21 15:23:46.752 Starting xl2tpd: xl2tpd.
Jul 21 15:23:46.891 ipsec__plutorun: 027 bad right --id: does not look numeric and name lookup failed (ignored)
Jul 21 15:23:46.892 ipsec__plutorun: 002 added connection description "Work"
Jul 21 15:23:47.123 104 "Work" #1: STATE_MAIN_I1: initiate
Jul 21 15:23:47.124 003 "Work" #1: received Vendor ID payload [RFC 3947] method set to=115
Jul 21 15:23:47.124 003 "Work" #1: received Vendor ID payload [Dead Peer Detection]
Jul 21 15:23:47.124 003 "Work" #1: ignoring unknown Vendor ID payload [8299031757a36082c6a621de00050282]
Jul 21 15:23:47.124 106 "Work" #1: STATE_MAIN_I2: sent MI2, expecting MR2
Jul 21 15:23:47.124 003 "Work" #1: NAT-Traversal: Result using draft-ietf-ipsec-nat-t-ike (MacOS X): i am NATed
Jul 21 15:23:47.124 108 "Work" #1: STATE_MAIN_I3: sent MI3, expecting MR3
Jul 21 15:23:47.124 004 "Work" #1: STATE_MAIN_I4: ISAKMP SA established {auth=OAKLEY_PRESHARED_KEY cipher=oakley_3des_cbc_192 prf=oakley_sha group=modp1024}
Jul 21 15:23:47.125 117 "Work" #2: STATE_QUICK_I1: initiate
Jul 21 15:23:47.125 003 "Work" #2: ignoring informational payload, type IPSEC_RESPONDER_LIFETIME msgid=8e08921c
Jul 21 15:23:47.125 003 "Work" #2: NAT-Traversal: received 2 NAT-OA. ignored because peer is not NATed
Jul 21 15:23:47.125 004 "Work" #2: STATE_QUICK_I2: sent QI2, IPsec SA established transport mode {ESP=>0x37742a26 <0x478d0d00 xfrm=AES_128-HMAC_SHA1 NATOA=none NATD=none DPD=none}
Jul 21 15:23:48.129 xl2tpd[2316]: Connecting to host Public IP, port 1701
Jul 21 15:23:48.168 xl2tpd[2316]: Connection established to Public IP, 1701. Local: 57627, Remote: 14608 (ref=0/0).
Jul 21 15:23:48.194 xl2tpd[2316]: Calling on tunnel 57627
Jul 21 15:23:48.212 xl2tpd[2316]: Call established with Public IP, Local: 14783, Remote: 14609, Serial: 1 (ref=0/0)
Jul 21 15:23:48.212 xl2tpd[2316]: start_pppd: I'm running:
Jul 21 15:23:48.213 xl2tpd[2316]: "/usr/sbin/pppd"
Jul 21 15:23:48.213 xl2tpd[2316]: "passive"
Jul 21 15:23:48.213 xl2tpd[2316]: "nodetach"
Jul 21 15:23:48.214 xl2tpd[2316]: ":"
Jul 21 15:23:48.214 xl2tpd[2316]: "file"
Jul 21 15:23:48.214 xl2tpd[2316]: "/etc/ppp/Work.options.xl2tpd"
Jul 21 15:23:48.215 xl2tpd[2316]: "/dev/pts/6"
Jul 21 15:23:48.331 pppd[2427]: Plugin passprompt.so loaded.
Jul 21 15:23:48.332 pppd[2427]: pppd 2.4.5 started by root, uid 0
Jul 21 15:23:48.333 pppd[2427]: Using interface ppp0
Jul 21 15:23:48.333 pppd[2427]: Connect: ppp0 <--> /dev/pts/6
Jul 21 15:23:52.345 pppd[2427]: Remote message: Login ok
Jul 21 15:23:52.346 pppd[2427]: PAP authentication succeeded
Jul 21 15:23:52.390 pppd[2427]: Deflate (15) compression enabled
Jul 21 15:23:52.429 pppd[2427]: local IP address Private IP
Jul 21 15:23:52.429 pppd[2427]: remote IP address Private IP
Jul 21 15:24:31.977 Stopping xl2tpd: xl2tpd.
Jul 21 15:24:31.977 xl2tpd[2316]: death_handler: Fatal signal 15 received
Jul 21 15:24:31.979 pppd[2427]: Modem hangup
Jul 21 15:24:31.979 pppd[2427]: Connect time 0.7 minutes.
Jul 21 15:24:31.980 pppd[2427]: Sent 10334 bytes, received 13370 bytes.
Jul 21 15:24:31.980 pppd[2427]: Connection terminated.
Jul 21 15:24:31.993 ipsec_setup: Stopping Openswan IPsec...
Jul 21 15:24:32.089 pppd[2427]: Exit.