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%properties = ( if_mac => { 0 => { value => '00:11:1A:F2:E1:92',
                                   fixed => 0
...
                                  },
                           }
                );

my @values = ( [ 'if_mac', 0, '00:11:1A:F2:E1:92' ],
               [ 'if_mac', 1, '00:11:1A:F2:E1:93' ],
               [ 'if_ip', 0, '132.181.30.3' ],
               [ 'if_ip', 1, '132.181.30.4' ]
               );