HOW-TO GEEK BOOKSRead our first book, the HTG Guide to Windows 8, or check our upcoming books. Enter your email below to get exclusive access to our best articles and tips before everybody else. Each network interface on your computer or any other networked device has a unique MAC address. MAC Address Filtering: Networks can use MAC address filtering, only allowing devices with specific MAC addresses to connect to a network. MAC Authentication: Some Internet service providers may require authentication with a MAC address and only allow a device with that MAC address to connect to the Internet. Most network cards will allow you to set a custom MAC address from their configuration panes in the Device Manager, although some network drivers may not support this feature.
Locate the network interface you want to modify under Network Adapters, right-click it, and select Properties. Modern Linux distributions like Ubuntu typically use Network Manager, which provides a graphical way to spoof a MAC address. For example, on Ubuntu you’d click the network icon on the top panel, click Edit Connections, select the network connection you want to modify, and click Edit. The network interface will generally be either en0 or en1, depending on whether you want to configure a Mac’s Wi-Fi or Ethernet interface.
You can verify your change took effect by running a command that shows your network connection details and checking what MAC address your network interface reports afterwards.
The real problem is going to be your layer-1 equipment (switches) and ARP: this is the protocol that resolves IP addresses to MAC addresses. If they're on the same Ethernet segment, this can cause all kinds of problems, depending on your network hardware.
There are situations where this works, however: this is actually a common practice on Windows servers, known as load balancing. When things go wrong with NLB, you get a situation where only one computer gets traffic, and the other one just sits there, deaf and dumb. ARP is the protocol that lets other computers look up your MAC address based on your IP address. If two computers had the same MAC and the same IP, they would both respond with the "that's me!" message at the same time.
In reality, though, network drivers check for address collisions and fail to start up when another computer responds to the "does anyone else have this MAC address?" question.
DID YOU KNOW?Although Star Trek: The Final Frontier did well at the box office in the summer of 1989, the film remains the least well received Star Trek film among both critics and fans (and maintains an IMBD rank significantly below the other films in the franchise). Disclaimer: Most of the pages on the internet include affiliate links, including some on this site. You can change the icon of just about any file, folder, volume, or application in Mac OS X.

Longtime Mac users know this process has been the same since the earliest days of Mac OS (System 7 was when icons first became changeable this way without the need for resource editing), but many newer OS X users are unfamiliar with the process, and thus it’s worth covering. For best results, always use a transparent PNG file for icons, and aim for the origin image to be 512×512 pixels to insure that it will scale up and down properly without becoming pixelated. The video below demonstrates how quick this is, from copying the origin image to use as the icon, then setting it as the new customized icon for the destination app. Customizing icons to have the same icon as one found elsewhere is more or less the same, but rather than going through Preview to open and copy an origin image, you can do everything from the Get Info panel as we’ll discuss next.
Similar to changing an icon to an image, you can also swap icons around between items, files, and folders.
Switching icons from another icon is how to put to use the hidden Apple hardware icons in Mac OS X, and many of the free icon packs downloaded from the web from sites like Interface Lift.
By the way, if you like a particular apps icon and want to use that elsewhere, you can use Preview app to quickly extract the highest resolution version of any apps icon. Thanks so much for this post, I was dreading having to redownload many, many png icons with icns files, this saves me so much time now.
Of course, like all long timer Mac users I know the Cmd-I copy & paste routine but I recently used LiteIcon to automate the procedure for me. In order to keep your Mac secure, it is good to set an administrator password which must be difficult to guess for others. For example, an airport Wi-Fi network might offer a free 30 minutes and then ban your MAC address from receiving more Wi-Fi. When you walk around, your smartphone scans for nearby Wi-Fi networks and broadcasts its MAC address.
So, on a typical laptop with both a Wi-Fi radio and a wired Ethernet port, the wireless and wired network interface each have unique, separate MAC addresses.
This involves taking the network interface down, running a command to change its MAC address, and then bringing it back up. Will the DHCP server assign the same IP address to both hosts if fixed hosts has been set up? Each manufacturer gets its own MAC header, and the manufacturer is responsible for never generating the same MAC ID twice. The problem is that Ethernet switches rely on the MAC address to know where to send packets.
Depending on the situation, you could lock up routers as the two computers fight for the same hardware address. Two servers assign the same MAC and IP address to their "public" network cards, and they share the traffic.
The receiving computer wouldn't know how to handle that: I believe the response to that situation is undefined, since it's never supposed to happen. Back in the ARCNet days, when you used 12 DIP switches to set the MAC, we used to have that happen sometimes.

This is an easy way to customize the appearance of items in the file system, and it can be a fun way to add a customized look to the desktop and home folder on a Mac.
Using a transparent PNG (or GIF) makes sure the icon won’t have a white border around it when placed in the Dock or on the desktop. Typically those icon packs are collections of folders or empty files with an icon assigned to each file or folder in the container, making them very easy to copy and paste and use elsewhere. Subscribe to the OSXDaily newsletter to get more of our great Apple tips, tricks, and important news delivered to your inbox! It is so convenient & it can use icns, ico, and png files which are the predominant file types nowadays when you go looking for icons. Here is the process that how a Mac Admin user can change his password, and set passwords for other users as well.
It will ask to enter New Password, Verify password, Password Hint, so fill the fields and click Reset Password button. A company named Renew London used trash bins in the city of London to track people’s movements around the city based on their MAC addresses. If you have 2 machines with the same MAC ID, the switch will get confused and only send packets to one machine. However, there are some serious side effects from doing this: the computers require a second pair of network adapters to coordinate between them.
The network card drivers would fail when we made the mistake of setting a card to an address that was always in use.
It only takes a moment per icon, and they can either be changed to icons belonging to another file or app, or changed to any image, and we’ll show how to do both.
If you’ve never done so before, it is very easy to create a transparent PNG on the Mac by using the built-in Preview app. So, in order to keep your Mac secure its important to create a strong password for Admin or you can reset it after a specific time period. Apple’s iOS 8 will use a random MAC address each time it scans for nearby Wi-Fi networks to prevent this sort of tracking. The most likely outcomes are that one computer will get all the traffic and the other will get none, or that the switch will sometimes send data to one PC and then to the other.
Standard images do work, but without transparency they will draw a border around the icon, looking more like the auto-generated image file thumbnails that appear in the Finder than what an icon should like like. Since the incoming MAC is never registered on the switch, all inbound packets are treated as broadcast packets and go to ALL comptuers on the subnet.
These are preinstalled images.If you do not want to use any picture in the list of desktop pictures, you may use your own picture, simply select iPhoto or other folders.

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