One solution is to use thread, have two socket listening on two threads.

#!/usr/bin/perl
use threads;
use IO::Socket::INET;
use strict;

threads->create(\&listening, 3000);
threads->create(\&listening, 3001);
<STDIN>;

sub listening {
    my $port = shift;
    my $listener = new IO::Socket::INET(Listen => 10, Timeout => 200, 
+LocalPort => $port);
    while (1) {
        my $client = $listener->accept();
        print "port $port got connection\n";
        #do something
    }
}
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