What are the methods of automatically generating MAC addresses by Linux
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There are many ways to generate MAC addresses under Linux. In addition to the common shell generation methods, you can also generate MAC addresses through Perl, ruby and other methods. The following editor makes a simple summary of the automatic generation methods of MAC addresses.
1. Shell generation method
Shell generation methods are the most numerous and feel to be the most simple and efficient. Here are several methods for random generation of commonly used tools:
Openssl tool generation
The code is as follows
Yang@crunchbang:~$ openssl rand-hex 6 | sed's / (. ) / 1GRAPHERA g; sUnix. UniUnix
A0:77:d4:ef:08:7d
Yang@crunchbang:~$ openssl rand 6 | xxd-p | sed's / (. ) / 1PUBG / 1GUBG; sPUBGUBG
3b:7f:95:c8:39:6d
Od generation
The code is as follows
Yang@crunchbang:~$ od-An-N10-x / dev/random | md5sum | sed-r's / ^ (. {10}). * $/ 1max; s / ([0-9a-f] {2}) / 1rig; sbank; $/ 1max; s / (0-max] {2}) / 1g; g; g, g
B0:85:1a:41:b1
Yang@crunchbang:~$
Yang@crunchbang:~$ od / dev/urandom-W6-tx1-An | sed-e's /'- e's /: /: / g'| head-n 1
D8:d3:67:20:c5:f2
For cycle generation
The code is as follows
Yang@crunchbang:~$ for i in {1... 6}; do printf "% 0.2X:" $[$RANDOM% 0x100]; done | sed's Gunther
8E:9E:FB:AE:FF:D2
Yang@crunchbang:~$ hog0123456789ABCDEF for c in {1.. 12}; do echo-n ${hgroup $(($RANDOM)): 1}; if [[$((c% 2) = 0 & & $c! = 12]]; then echo-n:; fi;done;echo
19:7F:A9:41:E2:20
Here again sigh, the language itself is not high-level, do not underestimate why shell,shell can achieve why we have to use perl, python, php and so on to achieve.
2. Perl generation method
The code is as follows
Yang@crunchbang:~$ perl-e'printf ("% .2x:", rand (255)) for (1.. 5); printf ("% .2xn", rand (255))'
F8:42:c1:d4:a8:28
Yang@crunchbang:~$ perl-e'print join (":", map {sprintf "% 0.2X", rand (256)} (1.. 6)). "n"'
A7:02:BD:BC:59:E2
The strength and simplicity of perl is indisputable.
Third, ruby generation method
The code is as follows
Yang@crunchbang:~$ ruby-e'puts (1.. 6) .map {"% 0.2X"% rand (256)} .join (":")'
CD:97:ED:52:B7:F4
The method used here is almost the same as in perl.
4. Python generation method
The code is as follows
Yang@crunchbang:~$ python-c "from itertools import imap; from random import randint; print': '.join ([' x% x for x in imap (lambda x:randint (0255), range (6)]])"
52:75:80:68:3a:cc
A python script is also available on the official centos and redhat sites:
The code is as follows
#! / 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: "x"% x, mac))
#
Print randomMAC ()
When you have a virtinst.util module, you can also generate new mac and uuid using the following simple statements:
The code is as follows
#! / 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 ""
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