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type="text/css">.pcb{margin-right:0}</style><div class="pcb"> <div class="t_fsz"> <table cellspacing="0" cellpadding="0"><tr><td class="t_f" id="postmessage_79281"> Mac地址全了解<br /> <br /> 近来在网上经常见有人问起Mac地址的问题，那么究竟Mac地址是什么？在现行的网络中，扮演什么角色呢？下面我们就一同来探讨一下关于Mac地址的知识。 <br /> <br /> 什么是Mac地址1 <br /> <br /> Mac地址就是在媒体接入层上使用的地址，通俗点说就是网卡的<a href="http://theory.oecr.com" target="_blank" class="relatedlink">物理</a>地址，现在的Mac地址一般都采用6字节48bit（在早期还有2字节16bit的Mac地址） <br /> <br /> 前24位由是生产厂家向IEEE申请的厂商地址(这可是要花钱的哦！据说1000美元才能买一个地址块)。后24位就由生产厂家自行定以了。(早期的2字节的却不用申请) <br /> <br /> IP地址和Mac地址有什么联系和区别 <br /> <br /> 大家都知道，现在有很多计算机都是通过先组建局域网，然后通过交换机和Internet连接的（大学里的校园网就是这样）。然后给每个用户分配固定的IP地址，由管理中心统一管理，这样为了管理方便就需要使用Mac地址来标志用户，防止发生混乱，明确责任（比如网络犯罪）。另外IP地址和Mac地址是有区别的，虽然他们在局域网中是一一对应的关系。IP地址是跟据现在的IPv4标准指定的，不受硬件限制比较容易记忆的地址，而Mac地址却是用网卡的物理地址，多少与硬件有关系，比较难于记忆。 <br /> <br /> 如何知道自己的Mac地址 <br /> <br /> 方法比较多，也比较得简单，在这里介绍两种常用的方法，在Win9x 可用：WinIPcfg获得，在2000、XP可用IPconfig -all获得。如果你已经给自己的网卡分配了IP还可以用 nbtstat -A 自己的IP 如下图，后者只能在2000/XP下使用。 <br /> <br /> 如何获得别人的Mac <br /> <br /> 其实上面已经涉及到了，如果是2000/XP用户可以用 nbtstat -A IP地址（还可以获得别的东东啊，可别学坏啊）。另外同一局域网内的，你可以用ping IP 或者ping 主机名，然后用arp -a 来获得。 <br /> <br /> 如何修改自己的Mac地址 <br /> <br /> Mac地址是保存在网卡的EPROM里面，通过网卡生产厂家提供的修改程序可以更改存储器里的地址，即使网卡没有这样的设置我们也可以通过间接的方法修改，一般网卡发出的包的源Mac地址并不是网卡本身写上去的，而是应用程序提供的，只是在通常的实现中，应用程序先从网卡上得到Mac地址，每次发送的时候都用这个Mac做为源Mac而已，Windows中，网卡的Mac保存在注册表中，实际使用也是从注册表中提取的，所以只要修改注册表就可以简单的改变Mac</td></tr></table> </div> <div id="comment_79281" class="cm"> </div> <div id="post_rate_div_79281"></div> </div> </div> </td></tr> <tr><td class="plc plm"> <div id="p_btn" class="mtw mbm hm cl"> <a href="http://club.oecr.com/home.php?mod=spacecp&ac=favorite&type=thread&id=9398&formhash=0cc02899" id="k_favorite" onclick="showWindow(this.id, this.href, 'get', 0);" onmouseover="this.title = $('favoritenumber').innerHTML + ' 人收藏'" title="收藏本帖"><i><img src="static/image/common/fav.gif" alt="收藏" />收藏<span id="favoritenumber" style="display:none">0</span></i></a> <a class="followp" 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</div><div class="postaaa posta1" id="post_79282" ><table id="pid79282" class="plhin" summary="pid79282" cellspacing="0" cellpadding="0"> <tr> <td class="pls" rowspan="2"> <div id="favatar79282" class="pls favatar"> <a name="lastpost"></a><div class="pi"> <div class="authi"><a href="http://club.oecr.com/space-uid-7493.html" target="_blank" class="xw1" style="color: #FF9900">suncon</a> </div> </div> <div class="p_pop blk bui card_gender_" id="userinfo79282" style="display: none; margin-top: -11px;"> <div class="m z"> <div id="userinfo79282_ma"></div> </div> <div class="i y"> <div> <strong><a href="http://club.oecr.com/space-uid-7493.html" target="_blank" class="xi2" style="color: #FF9900">suncon</a></strong> <em>当前离线</em> </div><dl class="cl"> <dt>积分</dt><dd><a href="http://club.oecr.com/home.php?mod=space&uid=7493&do=profile" target="_blank" class="xi2">150616</a></dd> </dl><div class="imicn"> <a href="http://club.oecr.com/home.php?mod=space&uid=7493&do=profile" target="_blank" title="查看详细资料"><img src="static/image/common/userinfo.gif" alt="查看详细资料" /></a> <a href="http://club.oecr.com/home.php?mod=magic&mid=showip&idtype=user&id=suncon" id="a_showip_li_79282" class="xi2" onclick="showWindow(this.id, this.href)"><img src="static//image/magic/showip.small.gif" alt="" /> IP卡</a> <a href="http://club.oecr.com/home.php?mod=magic&mid=checkonline&idtype=user&id=suncon" id="a_repent_79282" class="xi2" onclick="showWindow(this.id, this.href)"><img src="static//image/magic/checkonline.small.gif" alt="" /> 狗仔卡</a> </div> <div id="avatarfeed"><span id="threadsortswait"></span></div> </div> </div> <div> <div class="avatar"><a href="http://club.oecr.com/space-uid-7493.html" class="avtm" target="_blank"><img src="http://www.oecr.com/uc_server/avatar.php?uid=7493&size=middle" /></a></div> </div> </div> </td> <td class="plc"> <div class="pi"> <strong> <a href="http://bbs.oecr.com/forum.php?mod=redirect&goto=findpost&ptid=9398&pid=79282" id="postnum79282" onclick="setCopy(this.href, '帖子地址复制成功');return false;"> <em>2</em>楼</a> </strong> <div class="pti"> <div class="pdbt"> </div> <div class="authi"> <img class="authicn vm" id="authicon79282" src="static/image/common/ico_lz.png" /> 楼主<span class="pipe">|</span> <em id="authorposton79282">发表于 2004-2-5 10:31:00</em> <span class="pipe">|</span> <a href="http://bbs.oecr.com/forum.php?mod=viewthread&tid=9398&page=1&authorid=7493" rel="nofollow">只看该作者</a> </div> </div> </div><div class="pct"><div class="pcb"> <h2>Mac地址全了解</h2> <div class="t_fsz"> <table cellspacing="0" cellpadding="0"><tr><td class="t_f" id="postmessage_79282"> Win9x中修改： <br /> <br /> 打开注册表编辑器，在HKEY_LOCAL_MacHINE\SYSTEM\CurrentControlSet\Service\Class\Net\下的0000，0001，0002 Win2000/XP中的修改：同样打开注册表编辑器，HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Class\4D36E970-E325-11CE-BFC1-08002BE10318 中的0000,0001,0002中的DriverDesc,如果在0000找到，就在0000下面添加字符串变量，命名为NetworkAddress，值为要设置的Mac地址，例如：000102030405 <br /> 完成上述操作后重启就好了。 <br /> <br /> Linux下的修改： <br /> <br /> 1.必须关闭网卡设备，否则会报告系统忙，无法更改。 <br /> <br /> 命令是：/sbin/ifconfig eth0 down <br /> <br /> 2.修改Mac地址，这一步较Windows中的修改要简单。 <br /> <br /> 命令是：/sbin/ifconfig eth0 hw ether 00?AA?BB?CC?DD?EE <br /> <br /> 3.重新启用网卡 <br /> <br /> /sbin/ifconfig eth0 up网卡的Mac地址更改就完成了。 <br /> <br /> 现在还有很多软件提供了修改Mac地址的功能，如：Mac2001 <br /> <br /> 那么既然IP和Mac地址都可以改，那么怎么防御呢？通过简单的交换机端口绑定（端口的Mac表使用静态表项），可以在每个交换机端口只连接一台主机的情况下防止修改Mac地址的盗用，如果是三层设备还可以提供：交换机端口－IP－Mac 三者的绑定，防止修改Mac的IP盗用，这种方法更有效！还有些方法如配置交换机的VLAN，使用用户认证等，都略显复杂，再次不多浪费笔墨。 <br /> <br /> 通过上面的介绍我想大家对Mac地址应该有个比较全面的认识了吧？？呵呵，可别作坏事啊。</td></tr></table> </div> <div id="comment_79282" class="cm"> </div> <div id="post_rate_div_79282"></div> </div> </div> </td></tr> <tr><td class="plc plm"> </td> </tr> <tr id="_postposition79282"></tr> <tr> <td class="pls"></td> <td class="plc" style="overflow:visible;"> <div class="po hin"> <div class="pob cl"> <em> <a class="fastre" href="forum.php?mod=post&action=reply&fid=34&tid=9398&repquote=79282&extra=&page=1" 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