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邮电通讯系统 2022-06-20 67 0star收藏 版权: . 保留作者信息 . 禁止商业使用 . 禁止修改作品
Sniffer在以太网上的分析和防范
0引言
Sniffe:即嗅探器to是那些有经验的网络管理员用来解决某些数据传输问题时使用的一种有效工
具例如:假设网络的性能十分低下,而我们又不知道问题出在什么地方,此时就可以用Sniffer来
作出精确的问题判断.借助Sniffer,。。。。。。。。。。。
1Sniffer的工作原理
以太网是一种共享的媒体,它将在一个端口收到的数据包复制之后,向所有的端口进行转发,这
就意味着:同一个网段上的所有主机都能访问媒体上传输的所有数据.当网络接口处于正常状态时,
网络上所有机器虽然可以“听”到通过网络的所有数据,但一般只响应下列两种数据帧:第一种是目
的地址为本机地址的数据帧;第二种就是广播帧.这可以通过识别接收到的数据包的目的地址达到_
如果不是发给自己的数据包,则将其丢弃(换句话说,假设工作站A和工作站C处于同一个网段,
工作站A不会捕获属于工作站C的数据,而是简单地忽略这些数据)。。。。。。。。。。。。。

(Analysis and prevention of sniffer in Ethernet
0 Introduction
Sniffe: sniffer to is an effective tool used by experienced network administrators to solve some data transmission problems
For example, if the network performance is very low and we don't know what the problem is, we can use sniffer to
Make accurate problem judgments With the help of sniffer,...........
1snifer's working principle
Ethernet is a kind of shared media. It will forward packets received by one port to all ports after they are copied. This
This means that all hosts on the same network segment can access all data transmitted on the media When the network interface is in a normal state,
Although all the machines on the network can "hear" all the data through the network, they generally only respond to the following two data frames: the first is the destination
Data frame whose address is the local address; The second is broadcast frame This can be achieved by identifying the destination address of the received packet_
If the packet is not sent to itself, discard it (in other words, assume that workstation a and workstation C are in the same network segment,
Workstation a does not capture data belonging to workstation C, but simply ignores the data).............)

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