weekend monks...

I have a list of IP addresses in dot decimal format, a class A RFC 1918 internal addresses (10.0.0.0/8). I would like to scan these IP's for a service, but instead of doing it sequentially (10.0.0.1, 10.0.0.2, ...) I would like to intermix different class C's as much as possible. What I first tried did not work: 
my @list = ('10.1.1.1', '10.1.1.2', '10.2.2.1', '10.2.2.2');
@list = sort intermix @list;

sub intermix
{ 
    return (
        substr( $a, 0, rindex($a, '.'))
        eq 
        substr( $b, 0, rindex($b, '.'))
        )
    ? 1 : 0;
}

[download]
Randomizing the list would be one way sort of around the sequential problem, but not as neat as what I was looking for. The reason behind the requirement is to avoid hitting limits and easy the load on individual routers/switches for each segment. Any nice perl idioms to solve this problem?

Tiago

In reply to intermix list of items by tstock

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