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📁 鸟哥的linux私房菜
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	<title>鸟哥的 Linux 私房菜 -- 限制 Linux 对外的埠口 port limit</title>
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<span style="font-weight:bolder; color:#3333FF"><span class="text_head0">鸟哥的<span class="text_head_en"> 
	Linux </span>私房菜</span></span><br />
<span style="color:#000080">为取得较佳浏览结果，请爱用 <a href="http://moztw.org" target="_blank">firefox</a>
	浏览本网页</span><br />
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<!-- 本文的档头部分 -->
<div style="text-align:center">
    <a href="0210port_limit.php">
    <span class="text_head0">主机基本安全之一∶限制<span class="text_head_en"> Linux </span>对外连线的埠口</span></a><br />
</div>
    <div style="text-align:left">
        <a href="0210port_limit.php?thisscreen=800x600"><!--切换解析度为 800x600--></a>
    </div>
    <div style="text-align:right">
        <span class="text_history">最近更新日期∶2006/08/08</span>
    </div>


<!-- 本文的档头部分 -->
<table class="head1" summary="排版∶文章档头的说明"><tr><td class="head1">
	为什么我们的主机会回应网路上面的一些要求封包呢？例如我们设定了一部
	WWW 主机后，当有来自 Internet 的 WWW 要求时，我们的主机就会予以回应，这是因为我们的主机有启用了
	WWW 的监听埠口 (port) 啊！这里就要特别留意了，当我们启用了一个 daemon 时，就可能会造成主机的
	Port 在进行 Listen 的动作，此时该 daemon 就是已经对网路上面提供服务了！万一这个
	daemon 有漏洞，因为他提供 Internet 的服务，所以就容易被 Internet 上面的
	cracker 所入侵了！所以说，仔细的检查自己系统上面的 port 到底开了多少个，并且予以严格的管理，
	才能够降低被入侵的可能性啊！
</td></tr></table><br />

<!-- 本文的连结区部分 -->
<div class=block1>
<span class="text_h1">
1. <a href="#ports">Linux 的埠口 (port)</a><br />
	<span class=text_h2>
	    1.1 <a href="#ports_whatis">什么是 port ？</a><br />
	    1.2 <a href="#ports_look">观察 port</a>∶ 
		<a href="#netstat">netstat</a>, <a href="#nmap">nmap</a><br />
	</span>
2. <a href="#daemon">port 的启动与关闭</a><br />
	<span class=text_h2>
	    2.1 <a href="#daemon_what">stand alone 与 super daemon</a><br />
	    2.2 <a href="#daemon_boot">设定开机时启动服务</a><br />
	    2.3 <a href="#daemon_close">安全性的考量</a><br />
	</span>
3. <a href="#ex">课后练习</a><br />
<span class=text_h2>
4. <a href="http://phorum.vbird.org/viewtopic.php?p=112964"
        target="_blank">针对本文的建议∶http://phorum.vbird.org/viewtopic.php?p=112964</a><br />
</span>
</span>
</div>
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