necting client, the connection
will be allowed.

<p>
The <em>filter</em> parameter specifies the GeoIP value to which to apply
the configured <em>pattern</em> for matching.  The possible <em>filter</em>
values are:
<ul>
  <li><code>AreaCode</code>
  <li><code>ASN</code>
  <li><code>City</code>
  <li><a href="http://www.maxmind.com/en/country_continent"><code>Continent</code></a>
  <li><a href="http://www.maxmind.com/en/iso3166"><code>CountryCode</code></a>
  <li><code>CountryCode3</code>
  <li><code>Country