I have a machine on my network that needs to create a list of all mac addresses connected to the network. This is running OSX when I run the arp command it doesn't always display everything connected sometimes only the broadcast (255.255.255.0). However if I run the command on the DHCP server everything gets displayed.
The DHCP server is running Zentyal Linux. Are there any option I need to enable to allow anyone to scan the network?