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<a href="0230router.php">
<span class="text_head0">路由器<span class="text_head_en"> Router </span>设定</span></a><br />
</div>
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<span class="text_history">最近更新日期∶2006/08/30</span>
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<!-- 本文的档头部分 -->
<table class="head1" summary="排版∶文章档头的说明"><tr><td class="head1">
我们在 <a href="0110network_basic.php">网路基础</a>
里面提到 路由 (route) 是一个重要的概念，他可以控制我们的资料封包的走向！
此外，如果同一个网域里面有太多的电脑数量需要来广播的话，效能一定不会太好，所以才会有
Netmask 对吧！今天我们换个角度来想一想，如果说我的网域内真的有太多的电脑数量了，
那么将整个网域切割成较小的数个子网域 (Subnet) 会是一个比较好的作法，不过，
因为网域与网域之间的封包不可以直接互通资料，所以这个时候我们就需要使用
Router (路由器) 来帮忙封包的传送了！
</td></tr></table><br />
<!-- 本文的连结区部分 -->
<div class=block1>
<span class="text_h1">
1. <a href="#routing">路由</a><br />
<span class=text_h2>
1.1 <a href="#routing_table">路由表</a><br />
1.2 <a href="#routing_ip_alias">IP Alias 的测试功能</a><br />
1.3 <a href="#routing_double">重复路由的问题</a><br />
</span>
2. <a href="#route">路由器架设</a><br />
<span class=text_h2>
2.1 <a href="#route_what">什么是路由器</a><br />
2.2 <a href="#route_when">何时需要路由器？</a><br />
2.3 <a href="#route_static">静态路由之路由器</a><br />
2.4 <a href="#route_dynamic">动态路由之路由器设定∶zebra</a><br />
</span>
3. <a href="#arp_proxy">ARP Proxy 让路由器两端在同一网域</a><br />
4. <a href="#review">重点回顾</a><br />
5. <a href="#ex">课后练习</a><br />
6. <a href="#reference">参考资料</a><br />
<span class=text_h2>
7. <a href="http://phorum.vbird.org/viewtopic.php?t=26428"
target="_blank">针对本文的建议∶http://phorum.vbird.org/viewtopic.php?t=26428</a><br />
</span>
</span>
</div>
<!-- 本文的正式部分 -->
<hr /><a NAME="routing"></a><img src="images/penguin-m.gif" alt="大标题的图示" height="34" width="25" align="middle" /><span class="text_h1">路由</span><br />
<div class=block1>
我们在<a href="0110network_basic.php">网路基础</a>里面谈到过<a href="0110network_basic.php#route">路由</a>的相关概念，
他最大的功能就是在帮我们规划网路封包的传递方式与方向。
至于路由的观察则可以使用 <a href="0140networkcommand.php#route">route</a> 或者是
<a href="0140networkcommand.php#netstat">netstat</a> 来查阅与设定。
好了，那么路由的形式有哪些？您又该如何确认路由是否正确呢？<br /><br />
<hr /><a NAME="routing_table"></a><img src="../images/penguin-s.gif" alt="小标题的图示" height="23" width="16" align="middle" /><span class="text_h2">路由表</span><br />
<div class=block2>
如同前面网路基础谈到的，<span class=text_import2>每一部主机都有自己的路由表</span>，
也就是说，您必须要透过你自己的路由表来传递你主机的封包到下一个路由器上头。
若传送出去后，该封包就得要透过下一个路由器的路由表来传送了，此时与你自己主机的路由表就没有关系啦！
所以说，如果网路上面的某一部路由器设定错误，那.....封包的流向就会发生很大的问题。
我们就得要透过 <a href="0140networkcommand.php#traceroute">traceroute</a>
来尝试了解一下每个 router 的封包流向棉。<br /><br />
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