通配符 dns，不存在的子域指向主网站

在开始之前，我想说我已经阅读了有关 serverfault 的相关问题，但我找不到解决方案。

这是我的问题。我正在使用第三方 DNS，并且添加了通配符 A 记录 *.biglle.com，它指向我服务器的 IP 地址。我遇到的问题是每个不存在的子域都指向 biglle.com（那些确实存在的可以正常工作）。我想指出，biglle.com 的 apache 网站配置不是默认配置 (000-default.conf)，而是一个单独的配置 (biglle.com.conf)。这就是我无法理解的。不存在的子域应该指向默认配置文件，不是吗？

这是 biglle.com.conf 的一部分

<VirtualHost 192.168.1.54:80>
SuexecUserGroup "#1003" "#1004"
ServerName biglle.com
ServerAlias www.biglle.com
ServerAlias webmail.biglle.com
ServerAlias admin.biglle.com
DocumentRoot /home/biglle/public_html
ErrorLog /var/log/virtualmin/biglle.com_error_log
CustomLog /var/log/virtualmin/biglle.com_access_log combined
ScriptAlias /cgi-bin/ /home/biglle/cgi-bin/
ScriptAlias /awstats/ /home/biglle/cgi-bin/
DirectoryIndex index.html index.htm index.php index.php4 index.php5
<Directory /home/biglle/public_html>
Options -Indexes +IncludesNOEXEC +FollowSymLinks +ExecCGI
allow from all
AllowOverride All
AddHandler fcgid-script .php
AddHandler fcgid-script .php5
FCGIWrapper /home/biglle/fcgi-bin/php5.fcgi .php
FCGIWrapper /home/biglle/fcgi-bin/php5.fcgi .php5
</Directory>
<Directory /home/biglle/cgi-bin>
allow from all
</Directory>
RewriteEngine on
RewriteCond %{HTTP_HOST} =webmail.biglle.com
RewriteRule ^(.*) https://biglle.com:20000/ [R]
RewriteCond %{HTTP_HOST} =admin.biglle.com
RewriteRule ^(.*) https://biglle.com:10000/ [R]
RemoveHandler .php
RemoveHandler .php5
IPCCommTimeout 31
FcgidMaxRequestLen 1073741824
<Files awstats.pl>
AuthName "biglle.com statistics"
AuthType Basic
AuthUserFile /home/biglle/.awstats-htpasswd
require valid-user
</Files>
Alias /dav /home/biglle/public_html
Alias /pipermail /var/lib/mailman/archives/public
<Location /dav>
DAV on
AuthType Basic
AuthName "biglle.com"
AuthUserFile /home/biglle/etc/dav.digest.passwd
Require valid-user
ForceType text/plain
Satisfy All
RemoveHandler .php
RemoveHandler .php5
RewriteEngine off
</Location>
RedirectMatch /cgi-bin/mailman/([^/\.]*)(.cgi)?(.*) https://biglle.com:10000/virtualmin-mailman/unauthenticated/$1.cgi$3
RedirectMatch /mailman/([^/\.]*)(.cgi)?(.*) https://biglle.com:10000/virtualmin-mailman/unauthenticated/$1.cgi$3
php_value memory_limit 32M
</VirtualHost>

目前我正在使用 php hack 检查域名是否在 /etc/apache2/sites-enabled/ 中有相应的 .conf 文件，如果没有，它会显示 404 错误，但这显然不是永久的解决方案。此外，此 hack 仅适用于每个子域的索引页面。

由于我的代表不超过 10 个，我无法在此处发布示例。您可以在此处的粘贴中看到它们：http:
//pastebin.com/cYY3ffYz

编辑：apache2ctl -S 输出

root@biglle:/# apache2ctl -S
[Sun May 27 22:00:11 2012] [warn] NameVirtualHost 91.132.57.179:80 has no VirtualHosts
VirtualHost configuration:
192.168.1.54:80        is a NameVirtualHost
         default server biglle.com (/etc/apache2/sites-enabled/biglle.com.conf:1)
         port 80 namevhost biglle.com (/etc/apache2/sites-enabled/biglle.com.conf:1)
         port 80 namevhost fwnh.biglle.com (/etc/apache2/sites-enabled/fwnh.biglle.com.conf:1)
         port 80 namevhost itemlist.biglle.com (/etc/apache2/sites-enabled/itemlist.biglle.com.conf:1)
         port 80 namevhost lithisdoma.gr (/etc/apache2/sites-enabled/lithisdoma.gr.conf:1)
         port 80 namevhost think.biglle.com (/etc/apache2/sites-enabled/think.biglle.com.conf:1)
         port 80 namevhost topirouni.biglle.com (/etc/apache2/sites-enabled/topirouni.biglle.com.conf:1)
         port 80 namevhost videos.biglle.com (/etc/apache2/sites-enabled/videos.biglle.com.conf:1)
192.168.1.54:443       is a NameVirtualHost
         default server biglle.com (/etc/apache2/sites-enabled/biglle.com.conf:58)
         port 443 namevhost biglle.com (/etc/apache2/sites-enabled/biglle.com.conf:58)
wildcard NameVirtualHosts and _default_ servers:
*:80                   biglle.com (/etc/apache2/sites-enabled/000-default:1)
Syntax OK