irule optimization - redirect based on URL

Your iRule is fine as long as your list of sites doesn't grow too large. There is no physical limit to the number of contains you can use, but by joining many "or" operators together in a single if statement, you'll eventually suffer a slight performance degredatation. Data Groups are one option and another option is to use a switch statement.

when HTTP_REQUEST {
  set Client_IP [clientside {IP::remote_addr}]
  if { [IP::addr $Client_IP equals "141.227.1.2"] } {
    log local0. "c'est le proxy1"
    switch -glob [HTTP::host] {
      "*yahoo*" -
      "*bred*" {
        pool POOL_SURFING
        log local0. "on utilise le pool POOL_SURFING"
      }
      default {
        pool POOL_ISP
        log local0. "on utilise le pool ISP"
      }
    }
  } else {
    pool POOL_ISP
    log local0. "on utilise le pool ISP"
  }
}

I'd recommend you take a look at the "How to write fast iRules" document over in the wiki

http://devcentral.f5.com/wiki/default.aspx/iRules/HowToWriteFastRules.html

Click here

-Joe