按照 raspberrypi.org 上的指南操作后（https://www.raspberrypi.org/documentation/configuration/wireless/wireless-cli.md) 我以为它正常工作了，因为我获得了 IP 地址，但断开网络电缆后，pi 无法访问，直到再次插入。我是否遗漏了什么？
这是我从“ifconfig”输出的。
eth0 Link encap:Ethernet HWaddr b8:27:eb:38:b1:11
inet addr:192.168.1.22 Bcast:192.168.1.255 Mask:255.255.255.0
inet6 addr: fe80::9064:76fa:22d9:79a1/64 Scope:Link
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:972 errors:0 dropped:0 overruns:0 frame:0
TX packets:1459 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:206581 (201.7 KiB) TX bytes:169011 (165.0 KiB)
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:0 errors:0 dropped:0 overruns:0 frame:0
TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1
RX bytes:0 (0.0 B) TX bytes:0 (0.0 B)
wlan0 Link encap:Ethernet HWaddr 00:13:ef:c6:1b:c9
inet addr:192.168.0.22 Bcast:192.168.0.255 Mask:255.255.255.0
inet6 addr: fe80::7b9b:5b00:508d:3492/64 Scope:Link
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:2219 errors:0 dropped:9 overruns:0 frame:0
TX packets:356 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:501540 (489.7 KiB) TX bytes:41788 (40.8 KiB)