iRule bad behavior

I'd recommend setting the default pool you want your traffic to go to (the one with your IIS servers in it) at the beginning of the rule, or in an else clause after the if statement. This has to do with the way that the LB pointer is updated on multiple passes through a rule.

Something like:

when HTTP_REQUEST {
  if { [HTTP::uri] starts_with "/v6" } {
    pool WebApache
  } else {
    pool WebIIS
  }
}

Colin