Installation guide

Trend Micro™ InterScan™ Web Security Virtual Appliance 6.5 Installation Guide
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IWSVA Performance Tuning
If you are experiencing issues with slow browsing performance, consider the following
modifications and the InterScan Web Security Virtual Appliance (IWSVA) remote rating
service.
URL Filtering
IWSVA utilizes the Trend Micro URL Filtering Engine to perform URL categorization
and reputation rating based on the data supplied by the Trend Micro Web Reputation
feature. Trend Micro recommends using the default setting of a weekly update check to
ensure that your installation has the most current URL Filtering Engine.
IWSVA can control URL access based on Web Reputation feedback, the URL Filtering
module, or a combination of both. The combination of Web Reputation and the URL
Filtering module is a multi-layered, multi-threat protection solution provided by IWSVA.
The URL Filtering module grants or denies Web access based on the category to which
a URL belongs. Web Reputation grants or denies Web access based on whether the
requested URL is a phishing or pharming threat, has hacking potential, or has a
reputation score that deems it untrustworthy. Both the optional URL Filtering module
and Web Reputation are controlled by the specifications you make in policies.
For additional details, see Chapter 8 in the Administrator’s Guide.
LDAP Performance Tuning
When running IWSVA to use the User/group name authentication identification
method (LDAP), HTTP proxy performance becomes dependent upon the
responsiveness of the LDAP directory server. In a worst case scenario, every HTTP
request would require an LDAP query to authenticate the user's credentials. These
queries introduce latency in terms of the transmit and receive delay between IWSVA and
the LDAP server, and add load to the LDAP server itself.
LDAP Internal Caches
To reduce the amount of LDAP queries required, IWSVA provides several internal
caches: