Linux系统下如果没有安装udev的话，网卡不会以eth0的方式存在于系统里，系统会直接使用BIOS传递过来的设备名作为网卡名称，例如em1之类的。那么如何查看所有网卡的名称呢？
$ cat /proc/net/dev
Inter-| Receive | Transmit
face |bytes packets errs drop fifo frame compressed multicast|bytes packets errs drop fifo colls carrier compressed
bond0: 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
em2: 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
em4: 3587 18 0 0 0 0 0 2 11100 65 0 0 0 0 0 0
p3p1: 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
lo: 3934 64 0 0 0 0 0 0 3934 64 0 0 0 0 0 0
em1: 15196 117 0 18 0 0 0 19 15865 107 0 0 0 0 0 0
p3p2: 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
em3: 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
$ netstat -i
Kernel Interface table
Iface MTU Met RX-OK RX-ERR RX-DRP RX-OVR TX-OK TX-ERR TX-DRP TX-OVR Flg
bond0 1500 0 0 0 0 0 0 0 0 0 BMmU
em1 1500 0 193 0 33 0 144 0 0 0 BMRU
em2 1500 0 0 0 0 0 0 0 0 0 BMU
em3 1500 0 0 0 0 0 0 0 0 0 BMU
em4 1500 0 18 0 0 0 69 0 0 0 BMRU
lo 65536 0 119 0 0 0 119 0 0 0 LRU
p3p1 1500 0 0 0 0 0 0 0 0 0 BMsU
p3p2 1500 0 0 0 0 0 0 0 0 0 BMsU