Mac Address Assignment Spelling Homework Sheets
Next, the seventh bit from the left, or the universal/local (U/L) bit, needs to be inverted.This bit identifies whether this interface identifier is universally or locally administered.A public IP address is a digital address that is given to you by your internet service provider.However, that public IP address is assigned to your router - not each individual device in your home.While I was testing I used MACs in the space ::xx , but now we need to assign final MACs. represents any bit in the mac address, and X is the U/L bit and Y is the Uni/multi cast bit If the the eighth bit of a MAC address is 1, devices may have trouble getting IP addresses using DHCP.The question here is that the company that pays the project dont want to buy OUI mac space. If the eighth bit of a MAC address is 0, you may have more luck.This means another address is needed for your router to correctly forward data to each individual device on your network.Each device on your network has a unique MAC address.
I have finished a project for a company that uses Ethernet (TCP UDP) with a STM32F4 Device.If you click on a You Tube link, your request must travel, or 'hop' across many servers and routers to get to its final destination.Your public and private IP address stay the same throughout the journey, but the MAC address is constantly changing as your data hops around the world.Another doubt or frequently asked question is, are IPv6 devices (routers etc) today doing anything to that universal/local bit?Currently, nothing is being done be the U/L bit 1 or 0.Therefore, when the bit is inverted, it maintains its original scope (global unique address is still global unique and vice versa).The reason for inverting can be found in RFC4291 section 2.5.1.PCs, laptops, smartphones, tablets, smart devices, games consoles - to name a few.When their devices connect to the internet, websites and online services must communicate with them using their public IP address.If 0, the address is locally administered and if 1, the address is globally unique.It is worth noticing that in the OUI portion, the globally unique addresses assigned by the IEEE has always been set to 0 whereas the locally created addresses has 1 configured.