Creating a Script to Generate MAC Addresses

Creating a Script to Generate MAC Addresses

n some case you will need to generate a new and unique MAC address for a guest. There is no command line tool available to generate a new MAC address at the time of writing. The script provided below can generate a new MAC address for your guests. Save the script to your guest as macgen.py. Now from that directory you can run the script using ./macgen.py . and it will generate a new MAC address. A sample output would look like the following:

$ ./macgen.py 
00:16:3e:20:b0:11
 
#!/usr/bin/python
# macgen.py script to generate a MAC address for Red Hat Virtualization guests
#
import random
#
def randomMAC():
 mac = [ 0x00, 0x16, 0x3e,
  random.randint(0x00, 0x7f),
  random.randint(0x00, 0xff),
  random.randint(0x00, 0xff) ]
 return ':'.join(map(lambda x: "%02x" % x, mac))
#
print randomMAC() 

                                  OR

#! /usr/bin/python
# macgen.py script generates a MAC address for Xen guests
#
import random
mac = [ 0x00, 0x16, 0x3e,
random.randint(0x00, 0x7f),
random.randint(0x00, 0xff),
random.randint(0x00, 0xff) ]
print ':'.join(map(lambda x: "%02x" % x, mac))

Generates e.g.:
00:16:3e:66:f5:77
to stdout

 

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