"It is vital that you understand this before proceeding! The MAC address can be likened to the address of your building, '12 Router Avenue'. The destination IP address is like the name of your company. The router is the mailperson that stands in your street and shouts 'Where do I deliver mail for Evil Linux Routing Tricks INC?'. Your receptionist would then shout back 'Give it to the people over at 12 Router Avenue', which would prompt the mailperson to deliver mail at that building."