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show">|</span><a href="javascript:;" onclick="readmode($('thread_subject').innerHTML, 818);" class="show">阅读模式</a> </div> </div> </div><div class="pct"><style type="text/css">.pcb{margin-right:0}</style><div class="pcb"> <div class="typeoption"> <table summary="分类信息" cellpadding="0" cellspacing="0" class="cgtl mbm"> <caption>Linux</caption> <tbody><tr> <th>Linux 私房菜:</th> <td>服务器 » 二.主机的简易防火措施 » 8.路由概念与路由器 </td> </tr> </tbody> </table> </div> <div class="t_fsz"><table cellspacing="0" cellpadding="0"> <tr> <td class="t_f" id="postmessage_818"> <font size="4"><strong>1、重点回顾</strong></font><br /> <ul><li>网络卡的代号为 eth0, eth1, eth2...，而第一张网络卡的第一个虚拟接口为 eth0:0 ...<li>网络卡的参数可使用 ifconfig 直接设定，亦可使用配置文件如 /etc/sysconfig/network-scripts/ifcfg-ethn 来设定；<li>路由是双向的，所以由网络封包发送处发送到目标的路由规划，必须要考虑回程时是否具有相对的路由， 否则该封包可能会『遗失』；<li>每部主机都有自己的路由表，此路由表 (routing table) 是作为封包传送时的路径依据；<li>每部可对外 Internet 传送封包的主机，其路由信息中应有一个预设路由 (default gateway)；<li>要让 Linux 作为 Router 最重要的是启动核心的 IP Forward 功能；<li>重复路由可能会让你的网络封包传递到错误的方向；<li>动态路由通常是用在两个 Router 之间沟通彼此的路由规则用的，常见的 Linux 上的动态路由套件为 zebra ；<li>arp proxy 可以透过 arp 与 route 的功能，让路由器两端都在同一个网段内；<li>一般来说，路由器上都会有两个以上的网络接口<li>事实上，Router 除了作为路由转换之外，在 Router 上面架设防火墙，亦可在企业内部再分隔出多个需要安全 (Security) 的单位数据的区隔！<br /> </ul><br /> <br /> <br /> <br /> <font size="4"><strong>2、本章习题</strong></font><br /> <ul><li>在练习完本章的相关信息后，请将网络环境还原成如图 3.2-1 的模样！ 以方便未来后续章节的练习喔！这个章节的路由器确实是有点麻烦的！^_^<br /> </ul><br /> <ul><li>请问你如何将你的 eth0 这个接口修改成为 192.168.100.2 在网域 192.168.100.0/25 之内的网络参数内容？[jzsjiale_fold=答案]因为 192.168.100.0/25 的 netmask 为 255.255.255.128 ，所以可以这样做：<br /> ifconfig eth0 192.168.100.2 netmask 255.255.255.128 up<br /> 这样即可！如果尚须其他的参数，则需要以档案形式来下达，如 vi /etc/sysconfig/network-scripts/ifcfg-eth0，并修改为：<br /> DEVICE=eth0<br /> ONBOOT=yes<br /> BOOTPROTO=static<br /> IPADDR=192.168.100.2<br /> NETMASK=255.255.255.128<br /> NETWORK=192.168.100.0<br /> BROADCAST=192.168.100.127[/jzsjiale_fold]<br /> </ul><br /> <ul><li>请手动设定 eth0:1 这个虚拟接口，使成为网络参数： 192.168.200.2, 网域在 192.168.200.0/24。[jzsjiale_fold=答案]ifconfig eth0:1 192.168.200.2 up[/jzsjiale_fold]<li>如何观察路由表？[jzsjiale_fold=答案]route -n 即可查阅！注意到 0.0.0.0 那个目标(default gateway)。[/jzsjiale_fold]<li>如何启动 Linux 的 IP Forward 功能？[jzsjiale_fold=答案]直接以『echo "1" > /proc/sys/net/ipv4/ip_forward 』即可！[/jzsjiale_fold]<li>假设你是一个学校单位的信息管理员，学校内有 200 部计算机，奉上面大头的旨意，必须要将 200 部计算机分为 4 个 Subnet ，请问你应该如何布线(请画出示意图)？而这 4 个 Subnet 的网络参数如何选择(请自行选择)？而是否需要 Router ？如果需要的话，假设每个 Router 仅能有两个网络实体接口，那么该如何布线？(注：不要使用虚拟接口)<li>假设你想要连接到 168.95.1.1 ，那么你该如何判断你经过『多少个』节点？[jzsjiale_fold=答案]可以使用 traceroute 168.95.1.1 来分析每个节点的传送信息，也可以透过 ping 168.95.1.1 所回传的那个 ttl 值判断节点数量。[/jzsjiale_fold]<li>万一你的网络有点停顿，发现可能是网络上某个节点出现问题，你应该如何确认是哪一部 Router 出问题？[jzsjiale_fold=答案]就利用 traceroute 吧！[/jzsjiale_fold]<br /> </ul><br /> <br /> <font size="4"><strong>3、参考数据与延伸阅读</strong></font><br /> 注1：网中人写的『带宽负载平衡』：<a href="http://www.study-area.org/tips/multipath.htm" target="_blank">http://www.study-area.org/tips/multipath.htm</a><br /> 注2：一些生产网络硬设备的公司：<br /> <ul><li>思科 (Cisco) ：<a href="http://www.cisco.com/" target="_blank">http://www.cisco.com/</a><li>友讯 (D-Link) ：<a href="http://www.dlinktw.com.tw/" target="_blank">http://www.dlinktw.com.tw/</a><li>普联技术 (TP-Link) ：<a href="http://www.tplink.com.tw/" target="_blank">http://www.tplink.com.tw/</a><br /> </ul><br /> 注3：动态路由架设软件：<br /> <ul><li>动态路由软件 Quagga: <a href="http://www.quagga.net" target="_blank">http://www.quagga.net</a><li>动态路由软件 zebra: <a href="http://www.zebra.org" target="_blank">http://www.zebra.org</a><li>Ben 哥写的『实作 Linux 动态路由』：<a href="http://linux.vbird.org/somepaper/20060714-linux_cisco_route.pdf" target="_blank">http://linux.vbird.org/somepaper/20060714-linux_cisco_route.pdf</a><li>quagga 官方操作文件：<a href="http://www.quagga.net/docs/quagga.pdf" target="_blank">http://www.quagga.net/docs/quagga.pdf</a><br /> </ul><br /> 酷学园的 ARP Proxy：<a href="http://phorum.study-area.org/viewtopic.php?t=5619" target="_blank">http://phorum.study-area.org/viewtopic.php?t=5619</a><br /> 酷学园 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