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高手教你辨别ARP欺骗原理及防范被骗

更新时间:2026-08-19 13:43:45 | 编辑:薇糖 | 信息来源:互联网

  经常听到身边的朋友说,自己电脑的网络又被啥啥攻击了,经常有一些不道德的人用ARP欺骗软件攻击别人,让很多人掉线,甚至让整个网络都瘫痪。针对这个问题,我们首先先来了解下它的攻击原理及欺骗原理,深受其害的朋友们赶紧来看看。

  一, ARP欺骗的原理如下:

  假设这样一个网络,一个Hub接了3台机器

  HostA HostB HostC 其中

  A的地址为:IP:192.168.10.1 MAC: AA-AA-AA-AA-AA-AA

  B的地址为:IP:192.168.10.2 MAC: BB-BB-BB-BB-BB-BB

  C的地址为:IP:192.168.10.3 MAC: CC-CC-CC-CC-CC-CC

  正常情况下 C:\arp -a

  Interface: 192.168.10.1 on Interface 0x1000003

  Internet Address Physical Address Type

  192.168.10.3 CC-CC-CC-CC-CC-CC dynamic

  现在假设HostB开始了罪恶的ARP欺骗:

  B向A发送一个自己伪造的ARP应答,而这个应答中的数据为发送方IP地址是192.168.10.3(C的IP地址),MAC地址是DD-DD-DD-DD-DD-DD(C的MAC地址本来应该是CC-CC-CC-CC-CC-CC,这里被伪造了)。当A接收到B伪造的ARP应答,就会更新本地的ARP缓存(A可不知道被伪造了)。而且A不知道其实是从B发送过来的,A这里只有192.168.10.3(C的IP地址)和无效的DD-DD-DD-DD-DD-DD mac地址,没有和犯罪分子B相关的证据,哈哈,这样犯罪分子岂不乐死了。

  现在A机器的ARP缓存更新了:

  C:\>arp -a

  Interface: 192.168.10.1 on Interface 0x1000003

  Internet Address Physical Address Type

  192.168.10.3 DD-DD-DD-DD-DD-DD dynamic

  这可不是小事。局域网的网络流通可不是根据IP地址进行,而是按照MAC地址进行传输。现在192.168.10.3的MAC地址在A上被改变成一个本不存在的MAC地址。现在A开始Ping 192.168.10.3,网卡递交的MAC地址是DD-DD-DD-DD-DD-DD,结果是什么呢?网络不通,A根本不能Ping通C!!

  所以,局域网中一台机器,反复向其他机器,特别是向网关,发送这样无效假冒的ARP应答信息包,NND,严重的网络堵塞就开始了!网吧管理员的噩梦开始了。我的目标和任务,就是第一时间,抓住他。不过从刚才的表述好像犯罪分子完美的利用了以太网的缺陷,掩盖了自己的罪行。但其实,以上方法也有留下了蛛丝马迹。尽管,ARP数据包没有留下HostB的地址,但是,承载这个ARP包的ethernet帧却包含了HostB的源地址。而且,正常情况下ethernet数据帧中,帧头中的MAC源地址/目标地址应该和帧数据包中ARP信息配对,这样的ARP包才算是正确的。如果不正确,肯定是假冒的包,可以提醒!但如果匹配的话,也不一定代表正确,说不定伪造者也考虑到了这一步,而伪造出符合格式要求,但内容假冒的ARP数据包。不过这样也没关系,只要网关这里拥有本网段所有MAC地址的网卡数据库,如果和Mac数据库中数据不匹配也是假冒的ARP数据包。也能提醒犯罪分子动手了


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