mod_evasive install, then strange entry found in httpd.conf

[jols]

Anyone seen this one before? I just installed mod_evasive on a server running Apache 2.2 then found this stuff down around line #88 or so of the httpd.conf


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<IfModule mod_evasive20.c>
LoadModule auth_passthrough_module modules/mod_auth_passthrough.so

Include "/usr/local/apache/conf/php.conf"

DOSHashTableSize 3097

DOSPageCount 5

DOSSiteCount 100

DOSPageInterval 2

DOSSiteInterval 2

DOSBlockingPeriod 600

</IfModule>

<Directory "/">
Options All
AllowOverride All
</Directory>
LoadModule evasive20_module modules/mod_evasive20.so


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Questions:

-- Why would LoadModule auth_passthrough_module modules/mod_auth_passthrough.so be found within the mod_evasive IfModule?

-- Also, why would Include "/usr/local/apache/conf/php.conf" be there?

-- And why would the mod_evasive IfModule be in the httpd.conf file BEFORE the LoadModule evasive20_module modules/mod_evasive20.so entry?

I don't quite get it.