运用邻接矩阵法重现目标网络拓扑结构

从目标网络管理信息获知整个网络拓扑结构，通过Internet实施网络攻击，是信息战关注的课题。从分析SNMP协议安全策略得知，非法外部程序可用共同体名冒充合法网管程序与设备中的SNMP代理进程通信，并利用Get／Set从代理进程获取被管对象信息，操作数据单元从代理进程获得设备路由表、铁路表配置。据此，提出用图论和矩阵重现目标网络拓扑结构的邻接矩阵法。该方法利用交换机中的路由表，找出网络中各离散主机间的网络关系。由于网络设备和主机间的连接可用无向图表示，其节点间连接可表示成邻接矩阵，邻接矩阵也可转换成无向图。而该无向图正是根据主机和设备的路由表分析出的该网络的部分拓扑关系，进而就可获得主干网络拓扑结构。

Topology Structure of Object Network Reproduced by Adjacency Matrix

Acquiring the topology structure of the whole network from the management information of the object network and making the network attack through the Internet are the key problems of information combat. After analyzed security policy of SNMP, known that illegal outside program can imitate legal network management program by using Community name, and then, communicate with agent process of SNMP. Obtain information of object controlled from agent process with Get/Set, so the routing tables and the configuration of the link tables can be get by the agent process. According this, the method that can reproduce the topology structure of the object network by using figure theory and adjacency matrix was discussed. In the method, the network relation between discrete host computers of the network found out with the routing tables of exchanger. Because of the connection among network equipment and host computers can be shown by non-vector diagram and adjacency matrix also can be transformed into non-vector diagram, so, connection between nodes was shown adjacency matrix. According to the routing tables of network equipment and host computers, analyzed non-vector diagram, obtained part of topology relation of network, then, ulteriorly obtained the topology structure of the main network.