for $interface ( @$list ) {
	    set_interface_option $interface, 'use_input_chain', 1;
	    set_interface_option $interface, 'use_forward_chain', 1;

	    for $chain ( input_chain $interface, output_chain $interface ) {
		add_rule $filter_table->{$chain} , "-p udp --dport $ports -j ACCEPT";
	    }

	    add_rule( $filter_table->{forward_chain $interface} ,
		      "-p udp " .
		      match_dest_dev( $interface ) .
		      "--dport $ports -j ACCEPT" )
		if get_interface_option( $interface, 'bridge' );
	}
    }