Thu Feb 26, 2015 2:06 pm
In my opinion ARP table is not correct place, where you should monitor whether user is online or not,as ARP timeout is low.
ARP table timeout is 15-30 seconds, and even if 10 seconds are used as identification of user online status. Then your ARP table with >100 hosts will be like Christmas tree, that blinks all the time.
Please use Network monitor to check host status (online/offline)