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<TD><a href="/pcedu/index.html" >网络学院</a> > <a href="/pcedu/soft/index.html" >软件教室</a> > <a href="/pcedu/soft/st/index.html" >操作系统</a> > <a href="/pcedu/soft/st/linux/index.html" >Linux</a></TD>
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<TD ALIGN="CENTER"><FONT SIZE="3" COLOR="#339900"><B> 用Linux防火墙伪装抵住黑客攻击</B></FONT><BR>
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<P> 出处：PConline<BR>
责任编辑：zyq</P>
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<TD WIDTH="90">[01-11-30 15:29]
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<TD ALIGN="CENTER">作者：太平洋特色论坛
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在第二版核心前，“IP伪装”是以IP发送管理模块（IPFWADM，Ip fw adm）来管理。第二版核心虽然提供了更快、也更复杂的IPCHAINS，但仍旧提供了IPFWADM wrapper来保持向下兼容性，因此，作者在本文中会以IPFWADM为例，来解说如何设定“IP伪装（您可至 http://metalab.unc.edu/mdw/HOWTO/IPCHAINS-HOWTO.html查询使用IPCHAINS的方法，该页并有“IP伪装”更详尽的说明）。<br><br> 另外，某些应用程序如RealAudio与CU-SeeME所用的非标准封包，则需要特殊的模块，您同样可从上述网站得到相关信息。 <br><br> 作者的服务器有两张以太网卡，在核心激活过程中，分别被设定在eth0与eth1。 这两张卡均为SN2000式无跳脚的ISA适配卡，而且绝大多数的Linux都认得这两张卡。作者的以太网络初始化步骤在 rc.inetl中设定，指令如下： <br><br> IPADDR=“207.175.253.15”<br> #换成您缆线调制解调器的IP地址。 <br> NETMASK=“255.255.255.0" <br> #换成您的网络屏蔽。 <br> NETWORK=“207.175.253.0" <br> #换成您的网络地址。 <br> BROADCAST=“207.175.253.255" <br> #换成你的广播地址. <br> GATEWAY="207.175.253.254" <br> #换成您的网关地址. <br> #用以上的宏来设定您的缆线调制解调器以太网卡 <br> /sbin/ifconfig eth0 $ {IPADDR} broadcast ${BROADCAST}netmask ${NETMASK}<br><br> #设定IP路由表 <br> /sbin/route add -net ${NETWORK} netmask $ {NETMASK}eth0 <br> #设定intrang 以太网络卡eth1，不宏指令 <br> /sbin/ifconfig eth1 192.168.1.254 broadcast 192.168.1.255.netmask 255.255.255.0 <br> /sbin/route add -net 192.168.1.0 netmask 255.255.255.0eth1 <br> #接着设定IP fw adm初始化 <br> /sbin/ipfwadm -F-p deny <br> #拒绝以下位置之外的存取 <br> #打开来自192.168.1.X的传送需求 <br> /sbin/ipfwadm -F-a m -S 192.168.1.0./24-D 0.0.0.0/0 <br> /sbin/ipfwadm -M -s 600 30 120 <br><br> 就是这样！您系统的“IP伪装”现在应该正常工作了。如果您想得到更详细的信 息，可以参考上面所提到的HOWTO，或是至 http://albali.aquanet.com.br/howtos/Bridge +Firewall-4.html参考MINI HOWTO。另外关于安全性更高的防火墙技术，则可在 ftp://sunsite.unc.edu/pub/Linux/docs/HOWTO/Firewall-HOWTO中找到资料。 <br></P>
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