The Citrix NetScaler can be placed in front of a webserver farm that is running Apache. The same re-write rules that run on Apache, can be implemented on the Citrix NetScaler.
You can block a really annoying robot from retrieving pages of a specific webarea. This way you can ease up the traffic at some directories.
Example : This could be done by using a rule set which forbids the URLs of the web area /~quux/foo/arc/. This could also be accomplished by matching the User-Agent HTTP header information. In this example, the ip address to be blocked is 126.96.36.199 & 188.8.131.52.
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