OpenWrt reasoning on the number of client lines

There are two ways of doing this:

One.

DHCP client distribution list (disadvantage: The client list will be refreshed based on the time-out period, the general timeout is 12h)

Two.

Through the ARP cache list/proc/net/arp (disadvantage: The ARP refresh time to feel 30s, this time error can be accepted. )

The main explanation is another method:

Flags:0x0 is unable to find this host.

0X2 is the host also online.

IP address       HW type     Flags       HW address            Mask     Device192.168.235.1    0x1         0x2         00:01:41:80: E3:e9     *        eth0.210.1.1.191       0x1         0x0         c4:6a:b7:6f:7a:db     *        br-lan10.0.2.148       0x1         0x2         c0:3f:d5:31:d8:b2     *        br-lan2

So according to this flags it is possible to infer that this host is not on the line. Statistics are not 0 just right.

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OpenWrt reasoning on the number of client lines