前言：生产环境中很多时候不想其他人访问网站,只需要特定的几个ip访问,这种情况可参考如下处理方法：
将如下代码中的ip更换为您自己允许的ip即可。
web.config规则（支持iis7/iis8/iis10）

---

只允许单个ip访问站点：（请将118.118.118.118更换为您允许访问的ip）

<?xml version="1.0" encoding="UTF-8"?>
<configuration>
    <system.webServer>
        <rewrite>
            <rules>
                <rule name="band ip" stopProcessing="true">
                    <match url="(.*)" />
                    <conditions logicalGrouping="MatchAny">
                        <add input="%{HTTP_X_FORWARDED_FOR}&amp;%{REMOTE_ADDR}&amp;%{HTTP_X_Real_IP}" pattern="(118.118.118.118)" ignoreCase="false" negate="true" />
                    </conditions>
                    <action type="AbortRequest" />
                </rule>
            </rules>
        </rewrite>
    </system.webServer>  
</configuration>

---

允许多个ip或某个ip段访问：（注意ip间用竖线分隔,最后一个ip后面不加竖线 可以填写ip段,比如 114.114.114. 表示这个c段,注意后面有一个点号）

<?xml version="1.0" encoding="UTF-8"?>
<configuration>
    <system.webServer>
        <rewrite>
            <rules>
                <rule name="band ip" stopProcessing="true">
                    <match url="(.*)" />
                    <conditions logicalGrouping="MatchAny">
                        <add input="%{HTTP_X_FORWARDED_FOR}&amp;%{REMOTE_ADDR}&amp;%{HTTP_X_Real_IP}" pattern="(118.118.118.118|123.123.123.123|12.12.12.12|125.70.35.)" ignoreCase="false" negate="true" />
                    </conditions>
                    <action type="AbortRequest" />
                </rule>
            </rules>
        </rewrite>
    </system.webServer>  
</configuration>

---

Aapche允许单个ip访问：

<IfModule mod_rewrite.c>
RewriteEngine On
#Block ip
RewriteCond %{http:X-Forwarded-For}&%{REMOTE_ADDR}&%{http:X-Real-IP} !^(123.123.132.123)
RewriteRule (.*) - [F]
</IfModule>

---

Aapche允许多个ip访问：（注意ip间用竖线分隔,最后一个ip后面不加竖线）

<IfModule mod_rewrite.c>
RewriteEngine On
#Block ip
RewriteCond %{http:X-Forwarded-For}&%{REMOTE_ADDR}&%{http:X-Real-IP} !^(123.123.132.123|12.12.12.12)
RewriteRule (.*) - [F]
</IfModule>