Let’s say that you are using a hardware firewall. It may be Ipfire or Pfsense box or something else. You have a setup, which focuses on security and hence you have given each and every machine a static lease from the firewall’s dhcp server. The previous means that you might have a setup where dhcp range is small and occupied by your machines. Also, since you have given each machine a static lease you also know their local ip addresses and you are also able to tell all the mac addresses of the devices in your network. Continue reading →