1) 报文捕获 2) 对捕获消息进行分析，判断是否UDP包并且为SNMP消息 3) 分析SNMP消息各字段，并直观显示分析结果(1) message capture. 2) analyze the capture message to determine whether the UDP packet is and to be a SNMP message. 3) analyze the SNMP message fields and visualized the analysis res