How do I itterate to the next subnet of an IP address?

Ie, if I have 172.168.0.0/16, I'd like the next itteration to be 172.169.0.0/16

Or, if I have 10.0.0.0/24, the next should be 10.0.1.0/24

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";
[download]

## ERROR

 % ./t2.pl
Start ip [192.168.0.0]
start mask [24]
Can't call method "ip" on an undefined value at ./t2.pl line 15.
[download]

Cross posted from beginners@perl.org: http://www.nntp.perl.org/group/perl.beginners/2013/05/msg122907.html

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