Debian无线网卡为何是wlan1不是wlan0

操作系统版本：debian8

ifconfig -a 的结果：

eth0      Link encap:Ethernet  HWaddr xx:xx:xx:xx:xx:xx
UP BROADCAST MULTICAST  MTU:1500  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:1000
RX bytes:0 (0.0 B)  TX bytes:0 (0.0 B)

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:797 errors:0 dropped:0 overruns:0 frame:0
TX packets:797 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:240855 (235.2 KiB)  TX bytes:240855 (235.2 KiB)

wlan0     Link encap:Ethernet  HWaddr xx:xx:xx:xx:xx:xx
UP BROADCAST MULTICAST  MTU:1500  Metric:1
RX packets:589 errors:0 dropped:0 overruns:0 frame:0
TX packets:2686 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:314358 (306.9 KiB)  TX bytes:654179 (638.8 KiB)

wlan1     Link encap:Ethernet  HWaddr xx:xx:xx:xx:xx:xx
inet addr:192.168.12.111  Bcast:192.168.12.255  Mask:255.255.255.0
inet6 addr: fe80::225:22ff:fe4b:275c/64 Scope:Link
UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
RX packets:851 errors:0 dropped:0 overruns:0 frame:0
TX packets:1346 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:796722 (778.0 KiB)  TX bytes:215065 (210.0 KiB)

device number 是由udev决定的。

修改 /etc/udev/rules.d/70-persistent-net.rules 把 wlan1 改成 wlan0

# This file was automatically generated by the /lib/udev/write_net_rules
# program, run by the persistent-net-generator.rules rules file.
#
# You can modify it, as long as you keep each rule on a single
# line, and change only the value of the NAME= key.

# PCI device 0x10ec:0x8136 (r8169)
SUBSYSTEM=="net", ACTION=="add", DRIVERS=="?*", ATTR{address}=="xx:xx:xx:xx:xx:xx", ATTR{dev_id}=="0x0", ATTR{type}=="1", KERNEL=="eth*", NAME="eth0"

# PCI device 0x8086:0x008a (iwlwifi)
SUBSYSTEM=="net", ACTION=="add", DRIVERS=="?*", ATTR{address}=="xx:xx:xx:xx:xx:xx", ATTR{dev_id}=="0x0", ATTR{type}=="1", KERNEL=="wlan*", NAME="wlan0"

# USB device 0x:0x (rtl8187)
SUBSYSTEM=="net", ACTION=="add", DRIVERS=="?*", ATTR{address}=="xx:xx:xx:xx:xx:xx", ATTR{dev_id}=="0x0", ATTR{type}=="1", KERNEL=="wlan*", NAME="wlan1"

# USB device 0x:0x (rtl8192cu)
SUBSYSTEM=="net", ACTION=="add", DRIVERS=="?*", ATTR{address}=="xx:xx:xx:xx:xx:xx", ATTR{dev_id}=="0x0", ATTR{type}=="1", KERNEL=="wlan*", NAME="wlan2"