这是ifconfig的输出
# ifconfig enp0s3 Link encap:Ethernet HWaddr 08:00:27:ef:b6:e6 inet addr:192.168.2.3 Bcast:192.168.2.255 Mask:255.255.255.0 inet6 addr: fe80::cf19:776a:4d5c:36e0/64 Scope:Link UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 RX packets:713069 errors:0 dropped:0 overruns:0 frame:0 TX packets:6767 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:1000 RX bytes:45869812 (45.8 MB) TX bytes:667164 (667.1 KB) lo Link encap:Local Loopback inet addr:127.0.0.1 Mask:255.0.0.0 inet6 addr: ::1/128 Scope:Host UP LOOPBACK RUNNING MTU:65536 Metric:1 RX packets:1108 errors:0 dropped:0 overruns:0 frame:0 TX packets:1108 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:1000 RX bytes:86846 (86.8 KB) TX bytes:86846 (86.8 KB) 当我做
# ifdown enp0s3
它说未知的接口enp0s3
networking很好，没有任何问题。 它只是不起作用的命令
Ubuntu 16.04（Xenial）
下面是ip as的输出
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN group default qlen 1000 link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00 inet 127.0.0.1/8 scope host lo valid_lft forever preferred_lft forever inet6 ::1/128 scope host valid_lft forever preferred_lft forever 2: enp0s3: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP group default qlen 1000 link/ether 08:00:27:ef:b6:e6 brd ff:ff:ff:ff:ff:ff inet 192.168.2.7/24 brd 192.168.2.255 scope global enp0s3 valid_lft forever preferred_lft forever inet6 fe80::cf19:776a:4d5c:36e0/64 scope link valid_lft forever preferred_lft forever
下面是我的/ etc / network / interfaces
# interfaces(5) file used by ifup(8) and ifdown(8) auto lo iface lo inet loopback
nmcli输出sh
Wired connection 1 42d740b1-21c3-3b7c-8b9e-5922fe8a6380 802-3-ethernet enp0s3
ifup和ifdown用于设置/etc/network/interfaces列出的/etc/network/interfaces 。 enp0s3在这个文件中没有描述，所以我们绝对期望ifup和ifdown不知道如何处理它。 添加一些行如
iface enp0s3 inet dhcp
而且你会发现它会工作得更好。