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<p style="margin-top: 0px; margin-bottom: 1em; padding: 0px; border: none; list-style-type: none; outline: none; word-break: break-all; color: rgb(85, 85, 85); font-family: &quot;Microsoft YaHei&quot;, &quot;Helvetica Neue&quot;, Helvetica, Arial, sans-serif; white-space: normal; background-color: rgb(255, 255, 255);">首先，清除所有预设置<pre style="background-color: rgb(239, 239, 239); padding: 10px; border-left: 5px solid rgb(204, 204, 204); border-radius: 5px; overflow: auto; overflow-wrap: break-word; white-space: pre-wrap; color: rgb(85, 85, 85);">iptables&nbsp;-F</pre><p style="margin-top: 0px; margin-bottom: 1em; padding: 0px; border: none; list-style-type: none; outline: none; word-break: break-all; color: rgb(85, 85, 85); font-family: &quot;Microsoft YaHei&quot;, &quot;Helvetica Neue&quot;, Helvetica, Arial, sans-serif; white-space: normal; background-color: rgb(255, 255, 255);">其次，设置只允许指定ip地址访问指定端口<p style="margin-top: 0px; margin-bottom: 1em; padding: 0px; border: none; list-style-type: none; outline: none; word-break: break-all; color: rgb(85, 85, 85); font-family: &quot;Microsoft YaHei&quot;, &quot;Helvetica Neue&quot;, Helvetica, Arial, sans-serif; white-space: normal; background-color: rgb(255, 255, 255);">1、在tcp协议中，禁止所有的ip访问本机的8080端口。<pre style="background-color: rgb(239, 239, 239); padding: 10px; border-left: 5px solid rgb(204, 204, 204); border-radius: 5px; overflow: auto; overflow-wrap: break-word; white-space: pre-wrap; color: rgb(85, 85, 85);">iptables&nbsp;-I&nbsp;INPUT&nbsp;-p&nbsp;tcp&nbsp;--dport&nbsp;8080&nbsp;-j&nbsp;DROP</pre><p style="margin-top: 0px; margin-bottom: 1em; padding: 0px; border: none; list-style-type: none; outline: none; word-break: break-all; color: rgb(85, 85, 85); font-family: &quot;Microsoft YaHei&quot;, &quot;Helvetica Neue&quot;, Helvetica, Arial, sans-serif; white-space: normal; background-color: rgb(255, 255, 255);">2、允许192.168.1.123访问本机的1521端口<pre style="background-color: rgb(239, 239, 239); padding: 10px; border-left: 5px solid rgb(204, 204, 204); border-radius: 5px; overflow: auto; overflow-wrap: break-word; white-space: pre-wrap; color: rgb(85, 85, 85);">iptables&nbsp;-I&nbsp;INPUT&nbsp;-s&nbsp;211.211.211.211&nbsp;-p&nbsp;tcp&nbsp;--dport&nbsp;8080&nbsp;-j&nbsp;ACCEPT</pre><p style="margin-top: 0px; margin-bottom: 1em; padding: 0px; border: none; list-style-type: none; outline: none; word-break: break-all; color: rgb(85, 85, 85); font-family: &quot;Microsoft YaHei&quot;, &quot;Helvetica Neue&quot;, Helvetica, Arial, sans-serif; white-space: normal; background-color: rgb(255, 255, 255);">最后，保存当前规则<pre style="background-color: rgb(239, 239, 239); padding: 10px; border-left: 5px solid rgb(204, 204, 204); border-radius: 5px; overflow: auto; overflow-wrap: break-word; white-space: pre-wrap; color: rgb(85, 85, 85);">/etc/rc.d/init.d/iptables&nbsp;save&nbsp;
service&nbsp;iptables&nbsp;restart</pre><p style="margin-top: 0px; margin-bottom: 1em; padding: 0px; border: none; list-style-type: none; outline: none; word-break: break-all; color: rgb(85, 85, 85); font-family: &quot;Microsoft YaHei&quot;, &quot;Helvetica Neue&quot;, Helvetica, Arial, sans-serif; white-space: normal; background-color: rgb(255, 255, 255);">添加后打开iptables后如图所示,<pre style="background-color: rgb(239, 239, 239); padding: 10px; border-left: 5px solid rgb(204, 204, 204); border-radius: 5px; overflow: auto; overflow-wrap: break-word; white-space: pre-wrap; color: rgb(85, 85, 85);">-A&nbsp;INPUT&nbsp;-s&nbsp;192.168.1.123/32&nbsp;-p&nbsp;tcp&nbsp;-m&nbsp;tcp&nbsp;--dport&nbsp;1521&nbsp;-j&nbsp;ACCEPT
-A&nbsp;INPUT&nbsp;-p&nbsp;tcp&nbsp;-m&nbsp;tcp&nbsp;--dport&nbsp;1521&nbsp;-j&nbsp;DROP</pre><p style="margin-top: 0px; margin-bottom: 0px; padding: 0px; border: none; list-style-type: none; outline: none; word-break: break-all; color: rgb(85, 85, 85); font-family: &quot;Microsoft YaHei&quot;, &quot;Helvetica Neue&quot;, Helvetica, Arial, sans-serif; white-space: normal; background-color: rgb(255, 255, 255);"><img src="/ueditor/php/upload/image/20200809/1596955438711518.jpg" alt="" style="margin: 0px; padding: 0px; border: none; list-style-type: none; outline: none; max-width: 100%;"/>