Broadcast address: a binary anding question

Anonymous Monk has asked for the wisdom of the Perl Monks concerning the following question:

To get to your broadcast address you'd have to add the binary representations of your ip and corresponding netmask, true? Using perl's & operator this should be feasible with something like this simple-minded approach:

for (0..3){
    $broadcast[$_] = $ip[$_] & $netmask[$_]
}
[download]

But no, wide away, issues of precedence or context?

How would you do it? Thanks for your help!

Comment on Broadcast address: a binary anding question Download Code

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Re: Broadcast address: a binary anding question by quidity (Pilgrim) on Nov 24, 2000 at 16:53 UTC
CPAN is, as ever, your friend. I would use the Net::IPv4Addr module. From the synopsis: `use Net::IPv4Addr qw( :all ); my ($broadcast) = ipv4_broadcast($ip_str, $msk_str);` [download] Where $ip_str and $msk_str in this case (assuming you have (0..255) in your arrays) would be: `$ip_str = join('.', @ip); $msk_str = join('.', @netmask);` [download] If you want to know how your problem is solved in the module, then download it and use the source luke.	[reply] [d/l] [select]

Replies are listed 'Best First'.

Re: Broadcast address: a binary anding question
by quidity (Pilgrim) on Nov 24, 2000 at 16:53 UTC

CPAN is, as ever, your friend. I would use the Net::IPv4Addr module. From the synopsis:

use Net::IPv4Addr qw( :all );
my ($broadcast) = ipv4_broadcast($ip_str, $msk_str);
[download]

Where $ip_str and $msk_str in this case (assuming you have (0..255) in your arrays) would be:

$ip_str = join('.', @ip);
$msk_str = join('.', @netmask);
[download]

If you want to know how your problem is solved in the module, then download it and use the source luke.

[reply]
[d/l]
[select]