GNU Mac Changer

A GNU/Linux utility for viewing/manipulating the MAC address of network interfaces

Features

Set specific MAC address of a network interface
Set the MAC randomly
Set a MAC of another vendor
Set another MAC of the same vendor
Set a MAC of the same kind (eg: wireless card)
Display a vendor MAC list (today, 6800 items) to choose from

Possible usages

You should use your imagination :-), but well, these are some examples:

You're in a DHCP network with some kind of IP-based restriction
You've a cluster that boot with BOOTP and you want to have a clean set of MACs
Debug MAC based routes

Examples

# macchanger eth1
Current MAC: 00:40:96:43:ef:9c [wireless] (Cisco/Aironet 4800/340)
Faked MAC:   00:40:96:43:ef:9d [wireless] (Cisco/Aironet 4800/340)

# macchanger --endding eth1
Current MAC: 00:40:96:43:e8:ec [wireless] (Cisco/Aironet 4800/340)
Faked MAC:   00:40:96:6f:0f:f2 [wireless] (Cisco/Aironet 4800/340)

# macchanger --another eth1
Current MAC: 00:40:96:43:87:1f [wireless] (Cisco/Aironet 4800/340)
Faked MAC:   00:02:2d:ec:00:6f [wireless] (Lucent Wavelan IEEE)

# macchanger -A eth1
Current MAC: 00:40:96:43:39:a6 [wireless] (Cisco/Aironet 4800/340)
Faked MAC:   00:10:5a:1e:06:93 (3Com, Fast Etherlink XL in a Gateway)

# macchanger -r eth1
Current MAC: 00:40:96:43:f1:fc [wireless] (Cisco/Aironet 4800/340)
Faked MAC:   6b:fd:10:37:d2:34 (unknown)

# macchanger --mac=01:23:45:67:89:AB eth1
Current MAC: 00:40:96:43:87:65 [wireless] (Cisco/Aironet 4800/340)
Faked MAC:   01:23:45:67:89:ab (unknown)

# ./macchanger --list=Cray
Misc MACs:
Num   MAC        Vendor
---   ---        ------
065 - 00:00:7d - Cray Research Superservers,Inc
068 - 00:00:80 - Cray Communications (formerly Dowty Network Services)
317 - 00:40:a6 - Cray Research Inc.