我有一个使用 scapy 库进行嗅探的 Python 脚本。我希望我的树莓派每隔 X 分钟重启一次，将我的 wifi 加密狗网卡置于监控模式并重新启动嗅探脚本。同时我需要通过以太网连接互联网。
我第一次尝试设置一个这样的 crontab
@reboot sudo shutdown -r +X
@reboot sudo ifconfig wlan1 up
@reboot sudo airmon-ng start wlan1
@reboot sudo python myScript.py
并且它成功了。
pi@raspberrypi:~ $ ifconfig
eth0: flags=4163<UP,BROADCAST,RUNNING,MULTICAST> mtu 1500
inet 192.168.1.87 netmask 255.255.255.0 broadcast 192.168.1.255
inet6 fe80::4033:ce91:f9f7:c6c6 prefixlen 64 scopeid 0x20<link>
ether b8:27:eb:26:91:26 txqueuelen 1000 (Ethernet)
RX packets 164 bytes 17133 (16.7 KiB)
RX errors 0 dropped 1 overruns 0 frame 0
TX packets 196 bytes 33373 (32.5 KiB)
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<host>
loop txqueuelen 1000 (Local Loopback)
RX packets 0 bytes 0 (0.0 B)
RX errors 0 dropped 0 overruns 0 frame 0
TX packets 0 bytes 0 (0.0 B)
TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0
wlan0: flags=4099<UP,BROADCAST,MULTICAST> mtu 1500
ether b8:27:eb:73:c4:73 txqueuelen 1000 (Ethernet)
RX packets 0 bytes 0 (0.0 B)
RX errors 0 dropped 0 overruns 0 frame 0
TX packets 0 bytes 0 (0.0 B)
TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0
wlan1mon: flags=4163<UP,BROADCAST,RUNNING,MULTICAST> mtu 1500
unspec 00-C0-CA-97-F0-1D-00-00-00-00-00-00-00-00-00-00 txqueuelen 1000 (UNSPEC)
RX packets 6 bytes 832 (832.0 B)
RX errors 0 dropped 6 overruns 0 frame 0
TX packets 0 bytes 0 (0.0 B)
TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0
但后来 raspberry 开始为无线网卡赋予不同的名称（wlan1 为内置无线网卡，wlan0 为外部 USB 适配器）。我的 python 脚本总是使用 wlan1mon 进行嗅探，所以我不希望发生这种变化。
因此，我启用了可预测接口，raspi-config并且 USB 适配器开始被命名，mac 地址在wlx????????????哪里。 一切似乎都正常，但是当我将 crontab 更改为????????????
@reboot sudo shutdown -r +X
@reboot sudo ifconfig wlx???????????? up
@reboot sudo airmon-ng start wlx????????????
@reboot sudo python myScript.py
如果我输入命令iwconfigwlx???????????? 被正确设置为 wlan1mon 因为接口名称太长 但是我没有通过以太网进行互联网连接并且 ifconfig 给了我这个：
pi@raspberrypi:~ $ ifconfig
enxb827eb269126: flags=4163<UP,BROADCAST,RUNNING,MULTICAST> mtu 1500
inet6 fe80::4033:ce91:f9f7:c6c6 prefixlen 64 scopeid 0x20<link>
ether b8:27:eb:26:91:26 txqueuelen 1000 (Ethernet)
RX packets 164 bytes 17133 (16.7 KiB)
RX errors 0 dropped 1 overruns 0 frame 0
TX packets 196 bytes 33373 (32.5 KiB)
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<host>
loop txqueuelen 1000 (Local Loopback)
RX packets 0 bytes 0 (0.0 B)
RX errors 0 dropped 0 overruns 0 frame 0
TX packets 0 bytes 0 (0.0 B)
TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0
wlan0 和 wlan1mon 不再存在，并且以太网接口字段 inet 丢失。iwconfig
反而给我这个：
pi@raspberrypi:~ $ iwconfig
enxb827eb269126 no wireless extensions
wlan0 IEEE 802.11 ESSID:off/any
Mode:Managed Access Point:Not-Associated
Retry short limit:27 RTS thr:off Fragment thr:off
Power Management:on
wlan1mon IEEE 802.11 Mode:Monitor Tx-Power=20dBm
Retry short long limit:2 RTS thr:off Fragment thr:off
Power Management:off
lo no wireless extensions