使用zeroconf网络断开电缆连接后，必须重新启动网络服务

我正在使用运行Ubuntu 15.04的Wandboard（imx6）设备来实现类似自助服务终端的目的。在网络之间移动（现场无键盘访问）后，我将zeroconf网络用于初始配置。将网络更改为zeroconf设置后，网络接口无法正常工作。这是我的再现步骤（让我知道是否还有其他有用的内容可放入我的diag脚本中）：

1. 我重置为zeroconf设置，并在设备仍然插入lan的情况下重新启动

wandboard@lnm:~$ ./network-diag.sh 
+ cat /etc/network/interfaces
auto lo
iface lo inet loopback

auto eth0
iface eth0 inet static
  address 169.254.254.254
  netmask 255.255.0.0
  gateway 1.1.1.1

+ ip addr show eth0
2: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP group default qlen 1000
    link/ether 00:1f:7b:b2:14:96 brd ff:ff:ff:ff:ff:ff
    inet 169.254.254.254/16 brd 169.254.255.255 scope global eth0
       valid_lft forever preferred_lft forever
    inet6 fe80::21f:7bff:feb2:1496/64 scope link 
       valid_lft forever preferred_lft forever
+ ip route
169.254.0.0/16 dev eth0  proto kernel  scope link  src 169.254.254.254 

+ systemctl status sys-subsystem-net-devices-eth0.device
� sys-subsystem-net-devices-eth0.device - /sys/subsystem/net/devices/eth0
   Loaded: loaded
   Active: active (plugged) since Fri 2016-08-12 18:40:17 UTC; 1min 17s ago
   Device: /sys/devices/soc0/soc.1/2100000.aips-bus/2188000.ethernet/net/eth0

2. 拔下电缆，插入临时零配置网络

wandboard@lnm:~$ ./network-diag.sh 
+ cat /etc/network/interfaces
auto lo
iface lo inet loopback

auto eth0
iface eth0 inet static
  address 169.254.254.254
  netmask 255.255.0.0
  gateway 1.1.1.1

+ ip addr show eth0
2: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP group default qlen 1000
    link/ether 00:1f:7b:b2:14:96 brd ff:ff:ff:ff:ff:ff
    inet6 fe80::21f:7bff:feb2:1496/64 scope link 
       valid_lft forever preferred_lft forever
+ ip route

+ systemctl status sys-subsystem-net-devices-eth0.device
�  sys-subsystem-net-devices-eth0.device - /sys/subsystem/net/devices/eth0
   Loaded: loaded
   Active: active (plugged) since Fri 2016-08-12 18:40:17 UTC; 5min ago
   Device: /sys/devices/soc0/soc.1/2100000.aips-bus/2188000.ethernet/net/eth0

3. 现在，从Windows计算机在Zeroconf模式下无法访问设备。Pings返回“目标主机不可达”。但是随着网络的快速重启...

wandboard@lnm:~$ sudo service networking restart                                                                    
wandboard@lnm:~$ ./network-diag.sh 
+ cat /etc/network/interfaces
auto lo
iface lo inet loopback

auto eth0
iface eth0 inet static
  address 169.254.254.254
  netmask 255.255.0.0
  gateway 1.1.1.1

+ ip addr show eth0
2: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP group default qlen 1000
    link/ether 00:1f:7b:b2:14:96 brd ff:ff:ff:ff:ff:ff
    inet 169.254.254.254/16 brd 169.254.255.255 scope global eth0
       valid_lft forever preferred_lft forever
    inet6 fe80::21f:7bff:feb2:1496/64 scope link 
       valid_lft forever preferred_lft forever
+ ip route
169.254.0.0/16 dev eth0  proto kernel  scope link  src 169.254.254.254 

+ systemctl status sys-subsystem-net-devices-eth0.device
�  sys-subsystem-net-devices-eth0.device - /sys/subsystem/net/devices/eth0
   Loaded: loaded
   Active: active (plugged) since Fri 2016-08-12 18:40:17 UTC; 7min ago
   Device: /sys/devices/soc0/soc.1/2100000.aips-bus/2188000.ethernet/net/eth0

然后一切都很好。Windows计算机上的Ping立即开始完成。

这在现场给用户带来了困惑，他们最终关闭了设备并重新打开电源，直到设备响应为止。电缆切换事件发生后，如何在Zeroconf模式下按预期方式重新连接网络？

更新：allow-hotplug eth0似乎没有任何改变。

更新-更新：
遵循maxf的建议，仅在安装ifplugd（并对其进行配置！）之后，我的许多问题就消失了。注意：如果希望它监视接口，则必须在/ etc / default / ifplugd中配置ifplugd。我发现除了一种情况外，我的界面都可以正常联机：

╔═══════════╦═══════════════╦═══════════╦═════════╗
║ Boot with ║   bad link    ║ good link ║ no link ║
╠═══════════╬═══════════════╬═══════════╬═════════╣
║ dhcp      ║ ok            ║ ok        ║ ok      ║
║ zeroconf  ║ needs restart ║ ok        ║ ok      ║
╚═══════════╩═══════════════╩═══════════╩═════════╝

在此表中，我将引导配置了dhcp / zeroconf-static的设备，并且电缆插入所需的相对网络（坏链路），正确的网络（正常链路）或未连接（无链路）。然后，我将其连接到正确的网络，并查看接口是否正确联机。我发现只有在启动时连接到我的LAN的zeroconf配置无法连接到Zeroconf便携式计算机的临时网络。

这是我在/etc/ifplugd/action.d/中的动作脚本

#!/bin/sh

LNM_LOG=/tmp/ifplug.log
ZEROCONF_IP=169.254.254.254
date >> $LNM_LOG
echo $1 $2 >> $LNM_LOG
if [ "$1" = "eth0" -a "$2" = "up" -a $(grep -c $ZEROCONF_IP /etc/network/interfaces) -ne 0  ] ; then
    echo "eth0 plugged in for zeroconf, restart networking" >> $LNM_LOG
    service networking restart
    echo "network restarted" >> $LNM_LOG
fi