http://qs321.pair.com?node_id=467287


in reply to How to increment a MAC Address?

I missed this thread earlier, and the approach I took is pretty similar to zengargoyle's. 

#!/usr/bin/perl
use strict;
use warnings;

#use constant MAX_VAL => 255;
use constant MAX_VAL => 99;

my @MAC=(0) x 6;

sub PrintMAC
{
#  print join(':',map {sprintf('%02X',$_)} @_),"\n";
  print join(':',map {sprintf('%02D',$_)} @_),"\n";
}

my $CurNO = 5;
while ($CurNO >= 0)
{
  while ($MAC[$CurNO] < MAX_VAL)
  {
    PrintMAC(@MAC);
    $MAC[$CurNO]++;
  }
  $CurNO--;
}
PrintMAC(@MAC);

[download]

On a side note... if you uncomment the two commented lines and comment out the lines immediately below them, you'll get addresses in the full range.

Replies are listed 'Best First'.
Re^2: How to increment a MAC Address?
by Anonymous Monk on Dec 13, 2011 at 13:51 UTC
    Here i using the code for increment MAC address of last bit after increment last bit overflow so to over come again recount from starting eg: last position is FF then after we increment by 1 we start count by 00 ---------------- 
    #!/bin/sh
mac=$(ifconfig eth0|grep HWaddr|awk '{print $5}'| tr '[a-z]' '[A-Z]' |
+ cut -d ':' -f1-5)
maclast=$(ifconfig eth0|grep HWaddr|awk '{print $5}'| tr '[a-z]' '[A-Z
+]' | cut -d ':' -f6)
echo "Mac address= $mac:$maclast"
decmac=$(echo "ibase=16; $maclast"|bc)
if [ $decmac -eq '241' ]
then
macinc='00'
else
incout=`expr $decmac + 1 `
macinc=$(echo "obase=16; $incout"|bc)
fi
echo "Mac address= $mac:$macinc"

    [download]
    OUTPUT: 
    Mac address= 00:19:D1:F6:F7:F1

Mac address= 00:19:D1:F6:F7:00

    [download]
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