On 24/05/2013 21:18, shawn wilson wrote:
How do I find the next subnet? This should print 192.168.1.0 the
second time - it errors:
#!/usr/bin/env perl
use strict;
use warnings;
use Net::IP;
my $ip = Net::IP->new('192.168.0.0/24');
print "Start ip [" . $ip->ip . "]\n";
print "start mask [" . $ip->prefixlen . "]\n";
$ip->set($ip->last_ip);
$ip++;
$ip->set($ip->ip . "/" . $ip->prefixlen);
print "Start ip [" . $ip->ip . "]\n";
print "start mask [" . $ip->prefixlen . "]\n";
Or without Net::IP:
perl -Mstrict -wle'
my $subnet = $ARGV[0];
my ($ip, $bits) = $subnet =~ m{(\S+)/(\S+)}; # parse
my $ip_int = unpack "N", pack "CCCC", split /\./, $ip;
my $step = 1 << (32 - $bits);
#$ip_int &= (0xFFFFFFFF ^ ($step - 1)); # normalize
$ip_int += $step; # increment
my $next_ip = sprintf "%vd", pack "N", $ip_int;
print "$next_ip/$bits";
' 192.168.0.42/24
192.168.1.42/24
(you can activate the normalization if wanted)
--
Ruud
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