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查看 ARP 缓存列表:
可以看到当前在线客户端,比如:
root@RzAngel:~# cat /proc/net/arp
IP address HW type Flags HW address Mask Device
192.168.1.22 0x1 0x0 00:00:00:00:00:00 * eth1
192.168.1.5 0x1 0x0 00:00:00:00:00:00 * eth1
192.168.1.50 0x1 0x2 34:64:a9:9a:0c:79 * eth1
192.168.1.50 0x1 0x2 34:64:a9:9a:0c:78 * br-lan
192.168.1.110 0x1 0x0 00:00:00:00:00:00 * eth1
192.168.1.1 0x1 0x2 00:01:80:7b:ca:bb * eth1
192.168.1.138 0x1 0x0 00:00:00:00:00:00 * eth1
192.168.1.14 0x1 0x0 00:00:00:00:00:00 * eth1
192.168.1.168 0x1 0x0 00:00:00:00:00:00 * eth1
192.168.1.106 0x1 0x0 00:00:00:00:00:00 * eth1
192.168.1.12 0x1 0x0 00:00:00:00:00:00 * eth1
192.168.1.74 0x1 0x0 00:00:00:00:00:00 * eth1
192.168.1.102 0x1 0x0 00:00:00:00:00:00 * eth1
192.168.1.55 0x1 0x0 00:00:00:00:00:00 * eth1
192.168.1.70 0x1 0x0 00:00:00:00:00:00 * eth1
192.168.1.23 0x1 0x0 00:00:00:00:00:00 * eth1
192.168.2.126 0x1 0x2 90:2b:34:d1:aa:cd * br-lan
像上面的结果,Flags 标记下值为 0x2 的,表示该主机可以连通,值为 0x0 的表示不在线不能连通;此外,存活的主机还能看到 MAC 地址。
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