Openswan + xl2tpd连接超时一段时间后

Question

我有一个非本地的Openswan+xl2tpd服务器(Ubuntu12.04)，与NAT后面的Windows8连接。客户端在不做任何事情(在30到60分钟之间，但我没有计时)之后就失去了连接。

客户端没有启用它应该杀死不活动的连接。也不会进入睡眠模式。我也试着在24小时内杀了人，但没什么用。

客户端所在的NAT路由器是Debian Linux，它的路由器是Cisco，它将我们直接连接到服务器所在的数据中心。我们的其他连接，比如SSH，都不会因为不活动而中断(因为廉价的路由器)。不过，我还是试着打开/etc/ipsec.conf中的记事本：

config setup
    (...snip...)
    nat_traversal=yes
    force_keepalive=yes
    keep_alive=10

但这没什么用。

正如您稍后在配置中所看到的，死对等检测的操作是明确的。这将是第一个修复建议，但我需要明确，因为人们将连接从任何地方，但厨房水槽。此外，正如我说过的，在我现在的测试设置中，我看不到任何设备破坏它的连接。(编辑：“重新启动”也有相同的效果)

这是曾经发生过的事：

Jul 18 16:18:06 host xl2tpd[1918]: Maximum retries exceeded for tunnel 49070.  Closing.
Jul 18 16:18:06 host xl2tpd[1918]: Terminating pppd: sending TERM signal to pid 18359
Jul 18 16:18:06 host xl2tpd[1918]: Connection 4 closed to 89.188.x.y, port 1701 (Timeout)
Jul 18 16:18:11 host xl2tpd[1918]: Unable to deliver closing message for tunnel 49070. Destroying anyway.

这些在另一个：

Jul 18 17:44:39 host xl2tpd[1918]: udp_xmit failed to 89.188.x.y:1701 with err=-1:Operation not permitted
Jul 18 17:44:43  xl2tpd[1918]: last message repeated 4 times
Jul 18 17:44:43 host xl2tpd[1918]: Maximum retries exceeded for tunnel 10918.  Closing. 
Jul 18 17:44:43 host xl2tpd[1918]: udp_xmit failed to 89.188.x.y:1701 with err=-1:Operation not permitted
Jul 18 17:44:43 host xl2tpd[1918]: Terminating pppd: sending TERM signal to pid 26338
Jul 18 17:44:43 host xl2tpd[1918]: Connection 6 closed to 89.188.x.y, port 1701 (Timeout)
Jul 18 17:44:44 host xl2tpd[1918]: udp_xmit failed to 89.188.x.y:1701 with err=-1:Operation not permitted
Jul 18 17:44:48  xl2tpd[1918]: last message repeated 3 times
Jul 18 17:44:48 host xl2tpd[1918]: Unable to deliver closing message for tunnel 10918. Destroying anyway.
Jul 18 17:44:59 host xl2tpd[1918]: Can not find tunnel 10918 (refhim=0)
Jul 18 17:44:59 host xl2tpd[1918]: network_thread: unable to find call or tunnel to handle packet.  call = 0, tunnel = 10918 Dumping. 
Jul 18 17:45:09 host xl2tpd[1918]: Can not find tunnel 10918 (refhim=0)
Jul 18 17:45:09 host xl2tpd[1918]: network_thread: unable to find call or tunnel to handle packet.  call = 0, tunnel = 10918 Dumping. 
Jul 18 17:45:19 host xl2tpd[1918]: Can not find tunnel 10918 (refhim=0)
Jul 18 17:45:19 host xl2tpd[1918]: network_thread: unable to find call or tunnel to handle packet.  call = 0, tunnel = 10918 Dumping. 
Jul 18 17:45:29 host xl2tpd[1918]: Can not find tunnel 10918 (refhim=0)
Jul 18 17:45:29 host xl2tpd[1918]: network_thread: unable to find call or tunnel to handle packet.  call = 0, tunnel = 10918 Dumping. 
Jul 18 17:45:39 host xl2tpd[1918]: Can not find tunnel 10918 (refhim=0)
Jul 18 17:45:39 host xl2tpd[1918]: network_thread: unable to find call or tunnel to handle packet.  call = 0, tunnel = 10918 Dumping. 
Jul 18 17:45:49 host xl2tpd[1918]: Can not find tunnel 10918 (refhim=0)
Jul 18 17:45:49 host xl2tpd[1918]: network_thread: unable to find call or tunnel to handle packet.  call = 0, tunnel = 10918 Dumping.

版本：

• Ubuntu 12.04
• Openswan: 2.6.37-1
• xl2tpd: 3.1+dfsg-1
• 内核:3.2.049-泛型

吐露：

/etc/ipsec.conf：

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

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,%v4:!10.152.2.0/24
    oe=off
    protostack=netkey
    force_keepalive=yes
    keep_alive=10

conn L2TP-PSK-NAT
    rightsubnet=vhost:%priv
    also=L2TP-PSK-noNAT

conn L2TP-PSK-noNAT
    authby=secret
    pfs=no
    auto=add
    keyingtries=2
    rekey=no
    dpddelay=30
    dpdtimeout=120
    dpdaction=clear
    ikelifetime=8h
    keylife=1h
    type=transport
    left=%defaultroute
    leftprotoport=17/1701
    right=%any
    rightprotoport=17/%any

/etc/xl2tpd/xl2tpd.conf

[global]
ipsec saref = no

[lns default]
ip range = 10.152.2.2-10.152.2.254
local ip = 10.152.2.1
refuse chap = yes
refuse pap = yes
require authentication = yes
ppp debug = no
pppoptfile = /etc/ppp/options.xl2tpd
length bit = yes

/etc/ppp/options.xl2tpd：

require-mschap-v2
refuse-mschap
ms-dns 10.152.2.1
asyncmap 0
auth
crtscts
idle 1800
mtu 1200
mru 1200
lock
hide-password
local
#debug
name l2tpd
proxyarp
lcp-echo-interval 30
lcp-echo-failure 4

Answer 1

在您的/etc/ppp/options.xl2tpd文件中，您有“空闲1800”，即30分钟。

您可以尝试将该值设置为更高的值，或者做一些糟糕的事情，例如：

while true; do echo "c default" 1>/var/run/xl2tpd/l2tp-control; sleep 1500; done