查看通过无线/有线连接的设备
Approach 1
$ cat /proc/net/arp
IP address HW type Flags HW address Mask Device
192.168.0.1 0x1 0x2 **:95:**:5c:**:79 * eth0.2
192.168.1.242 0x1 0x2 **:6c:**:77:**:40 * br-lan
192.168.0.124 0x1 0x0 **:00:**:00:**:00 * eth0.2
192.168.1.198 0x1 0x2 **:8d:**:5a:**:3c * br-lan
- Flags标志可以表示是否在线状态，0x0表示离线，标志0x2表示在线
- Device表示接口的名称
Approach 2
$ cat /tmp/dhcp.leases
1505227895 **:6c:**:77:**:40 192.168.1.242 android-5734b930181b5156 *
1505225907 **:8d:**:5a:**:3c 192.168.1.198 DESKTOP-AFGM9OL 01:40:8d:5c:5a:a0:3c
可以看到mac地址，IP，设备名等信息
查看 WIFI 连接设备
$ opkg update && opkg install iwinfo
$ iwinfo
wlan0 ESSID: unknown
Access Point: DC:A6:32:B1:0E:06
Mode: Client Channel: 34 (5.170 GHz)
Tx-Power: 0 dBm Link Quality: unknown/70
Signal: unknown Noise: unknown
Bit Rate: unknown
Encryption: unknown
Type: nl80211 HW Mode(s): 802.11bgnac
Hardware: 02D0:A9A6 0000:0000 [Generic MAC80211]
TX power offset: unknown
Frequency offset: unknown
Supports VAPs: no PHY name: phy0
#ra0 是设备的名称，根据实际情况也可能是wlan0或者其他名称
$ iwinfo ra0 assoclist
结果：
**:**:**:C6:76:26 -44 dBm / -57 dBm (SNR 13) 37000 ms ago
RX: 65.0 MBit/s, MCS 7, 20MHz 0 Pkts.
TX: 65.0 MBit/s, MCS 7, 20MHz 0 Pkts.
**:**:**:FF:91:98 -44 dBm / -57 dBm (SNR 13) 6000 ms ago
RX: 65.0 MBit/s, MCS 7, 20MHz 0 Pkts.
TX: 65.0 MBit/s, MCS 7, 20MHz 0 Pkts.