Re: How to increment a MAC Address?

my way to tackle this would be to split the 6 groups of digits using my @numbers = split(/:/, $string); after which you can access each of the sets as $numbers[0] through to $numbers[5]. Whenever you need them back in string form you can put it back together using join(':', @numbers);

Now the real question is, last time I checked MAC addresses were in hexadecimal, so you're still in need of ABCDEF on top of the 0 through 9? Besides that, why would you want to iterate through every possible MAC address in the first place?

Remember rule one...

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Re^2: How to increment a MAC Address? by mda2 (Hermit) on Jun 16, 2005 at 17:04 UTC
To increment a MAC Address, you need to convert HEX to DEC, Add AND convert DEC to HEX... I propose this code. `sub addmac { my ( $mac, $add ) = @_; $mac =~ s/://g; my $dec = hex($mac); $mac = sprintf("%012x", $dec+$add); return join(":", $mac =~ /(..)/g ); } my $mac = '00:00:00:00:00:f1'; foreach ( 1 .. 32 ) { $mac = addmac($mac,$_*4); print "$mac\n"; }` [download] I think others improve are possible, but it do a task. `... 00:00:00:00:01:a5 00:00:00:00:01:cd 00:00:00:00:01:f9 00:00:00:00:02:29 00:00:00:00:02:5d ... 00:00:00:00:03:9d 00:00:00:00:03:e9 00:00:00:00:04:39 00:00:00:00:04:8d` [download] -- Marco Antonio Rio-PM	[reply] [d/l] [select]
Re^3: How to increment a MAC Address? by merlyn (Sage) on Jun 16, 2005 at 17:08 UTC
HEX to DEC You mean convert a hex string to a number. It's not a decimal number until you print it for output. I don't see any place that you are stringifying it. -- Randal L. Schwartz, Perl hacker Be sure to read my standard disclaimer if this is a reply.	[reply]
Re^4: How to increment a MAC Address? by mda2 (Hermit) on Jun 16, 2005 at 17:47 UTC
I did this: `# clear separators to obtain a hex string $mac =~ s/://g; # convert hex string into a dec number my $dec = hex($mac); # revert into a hex string $mac = sprintf("%012x", $dec+$add);` [download] I don't see error here. I think it's used by context... -- Marco Antonio Rio-PM	[reply] [d/l]
Re^5: How to increment a MAC Address? by merlyn (Sage) on Jun 16, 2005 at 17:53 UTC
Re^3: How to increment a MAC Address? by ikegami (Patriarch) on Jun 17, 2005 at 23:13 UTC
Close, but not quite. You're trying to store a 48bit number into a 32bit variable. (Well, it's 32 bit on my Windows machine.) You have an overflow problem. `my $dec = hex('FF0000000000'); printf("%012x", $dec); __END__ Integer overflow in hexadecimal number at !.pl line 1 0000ffffffff` [download] You could use Math::BigInt, or you could use floating point numbers (`double`s) as I've previously detailed.	[reply] [d/l] [select]
Re^2: How to increment a MAC Address? by aditya.singh (Acolyte) on Jun 16, 2005 at 12:04 UTC
You code prints: 00:00:00:00:00:99 00:00:00:00:01:00 00:00:00:00:01:01 OP wants: 00:00:00:00:00:99 00:00:00:00:01:99 00:00:00:00:02:99 and so on. Note: Once the pair of digit reaches 99, it does not roll back to 00.	[reply]


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