33.9. Generating a new unique MAC address
In 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 guests on Xen # 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()
Another method to generate a new MAC for your guest
You can also use the built-in modules of python-virtinst to generate a new MAC address and UUID for use in a guest configuration file:
# echo 'import virtinst.util ; print\ virtinst.util.uuidToString(virtinst.util.randomUUID())' | python # echo 'import virtinst.util ; print virtinst.util.randomMAC()' | python
The script above can also be implemented as a script file as seen below.
#!/usr/bin/env python # -*- mode: python; -*- print "" print "New UUID:" import virtinst.util ; print virtinst.util.uuidToString(virtinst.util.randomUUID()) print "New MAC:" import virtinst.util ; print virtinst.util.randomMAC() print ""
