Change mac address ifconfig os x

I just have to run a small script on startup but still…. I work on OS X Lion The thing is I cannot connect to any of the wireless networks! Each time I have to revert to the original MAC address in order to have internet access. Hi, I have a problem…when I try to change address with sudo ifconfig en1 Wi-Fi xx:xx:xx:xx:xx:xx it ask me the password but I cannot type anything…anyone can help me?

You should not just randomly generate a mac address without knowing how these are assigned. The least significant bit of the first byte MUST be 0 otherwise it will be considered a multicast ethernet and arp to some routers will be ignored. If the least significant bit of the most significant address octet is set to 1, the frame will still be sent only once; however, NICs will choose to accept it based on different criteria than a matching MAC address: for example, based on a configurable list of accepted multicast MAC addresses.

This is called multicast addressing. The MAC layer address is used by the local network router and switch. It is not used once packets leave the local network so I have no idea why anyone would need to change the MAC layer address. A lot of networks and routers filter access by MAC address, changing it to an approved address can be necessary. Not necessarily. IT runs into this all the time when network resources are determined by MAC. You know airport wifi where you get 30 minutes, on 30 mb free.

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How to Change MAC Address on Mac Easily

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What Is a MAC Address?

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How to Spoof your MAC Address in Mac OS X

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Spoofing a MAC address

This applies to all types of network cards, including Ethernet cards and WiFi cards. The MAC Address is a six-byte number or digit hexadecimal number that is used to uniquely identify a host on a network. All MAC addresses are hard-coded into a network card and can never be changed.

However, you can change or spoof the MAC address in the operating system itself using a few simple tricks. So why would you want to change your MAC address? Well there are many reasons for this, mostly related to bypassing some kind of MAC address filter set on a modem, router or firewall. For example, a WiFi network may allow only authorized computers to connect to the network and filters out computers based on the MAC address.

How to Find and Change MAC Address

Another example is if you have an ISP that allows only a certain number of computers to connect to the Internet from your home. If you have more computers that need to connect, you can spoof the MAC address of an authorized computer and connect from a different computer. By default, the Not Present value is selected.

Go ahead and click on the Value radio button and enter in a new MAC address. The MAC address is a combination of 6 pairs of numbers and characters, i. You should enter the MAC address without the dashes. Go ahead and restart the computer in order for the changes to take effect.

This is the simplest way to change your MAC address in Windows. Firstly, you have to use Terminal similar to command prompt in Windows to actually change the MAC address. Secondly, you need to manually figure out the technical name of the adapter before you can change the settings. You can do this in one of two ways: via System Preferences or via Terminal.