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LAN 连接正常，但重启后无 WAN。Mac Virtual Box 上的 Ubuntu

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LAN 连接正常，但重启后无 WAN。Mac Virtual Box 上的 Ubuntu

LAN 正常，但重启后没有 WAN 连接。

ubu@ubu-VirtualBox:~$ ifconfig 
enp0s8: flags=4163<UP,BROADCAST,RUNNING,MULTICAST>
        mtu 1500
        inet 172.18.1.251
        netmask 255.255.255.0
        broadcast 172.18.1.255
        inet6 fe80::a00:27ff:fed1:1079
        prefixlen 64
        scopeid 0x20 
        ether 08:00:27:d1:10:79 
        txqueuelen 1000 (Ethernet) 
        RX packets 6998 
        bytes 1539098 (1.5 MB) 
        RX errors 0 
        dropped 0 
        overruns 0 
        frame 0 
        TX packets 2117 
        bytes 196789 (196.7 KB) 
        TX errors 0 
        dropped 0 
        overruns 0 
        carrier 0 
        collisions 0
    
lo:   flags=73<UP,LOOPBACK,RUNNING>
      mtu 65536 
      inet 127.0.0.1 
      netmask 255.0.0.0 
      inet6 ::1 
      prefixlen 128 
      scopeid 0x10 
      loop txqueuelen 1000 (Local Loopback) 
      RX packets 3547 
      bytes 317490 (317.4 KB) 
      RX errors 0 
      dropped 0
      overruns 0
      frame 0 
      TX packets 3547 
      bytes 317490 (317.4 KB) 
      TX errors 0 
      dropped 0 
      overruns 0 
      carrier 0 
      collisions 0

ubu@ubu-VirtualBox:~$ netstat -nr 
Kernel IP routing table 
Destination     Gateway       Genmask     Flags  MSS  Window  irtt    Iface 
169.254.0.0     0.0.0.0     255.255.0.0       U    0       0     0   enp0s8
172.18.1.0      0.0.0.0     255.255.255.0     U    0       0     0   enp0s8
172.18.1.0      172.18.1.1  255.255.255.0    UG    0       0     0   enp0s8 
ubu@ubu-VirtualBox:~$

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