Route Traffic Based on Header Info

This rule assumes you change "default" below to the pool you'd like non-matching traffic to use. Also, you'll want to use OneConnect to ensure the HTTP info is evaluated and traffic is sent accordingly.

More can be read about that here:

http://devcentral.f5.com/Tutorials/TechTips/tabid/63/articleType/ArticleView/articleId/114/OneConnect-For-my-iRule.aspx

Finally, you can either make a list of addresses in a "class/data group" and check whether they exist, or you can specify them from within the rule. How many addresses do you have total to check? that can influence whether you go one way or the other.

when HTTP_REQUEST {
    if { [HTTP::header "X-Forwarded-For"] contains "64.238.106.226" } {
         pool mysite }
   else { pool default }
    }