Redirect or rewrite?

The first line looks fine, but I did make the mistake of assuming that you could use the IP::addr command in this way. Since the IP::addr command takes two arguments, you won't be able to use it in a switch statement. That means you'll have to use a series of if/else comparisons if you want to compare network ranges with multiple destinations. Since your example only uses a single pool as a destination, you could use the or command instead of multiple ifs.

So, if you're just comparing single IP addresses, you could do so like:

  
  when HTTP_REQUEST {   
    if { [string tolower [HTTP::path]] eq "/foo/"} {   
      switch [IP::remote_addr] {   
        10.12.126.248 -   
        10.12.126.249 -   
        10.12.126.250 -   
        10.24.69.2 -    
        default {   
          pool FOO.com-80   
        }   
      }   
    } elseif {[IP::addr [IP::remote_addr] equals 10.0.0.0/255.0.0.0] } {   
      HTTP::redirect "http://www.NEW.com"  
    }   
  }   
  

If you need to compare network ranges, and therefore need the IP::addr command, you would want something more like:

  
  when HTTP_REQUEST {   
    if { [string tolower [HTTP::path]] eq "/foo/"} {   
      if {([IP::addr [IP::remote_addr] equals 10.12.126.248/255.255.255.255]) or   
      ([IP::addr [IP::remote_addr] equals 10.12.126.249/255.255.255.255]) or  
      ([IP::addr [IP::remote_addr] equals 10.12.126.250/255.255.255.255]) or  
      ([IP::addr [IP::remote_addr] equals 10.24.69.2/255.255.255.255])  
      } {   
        pool FOO.com-80   
      }   
    } elseif {[IP::addr [IP::remote_addr] equals 10.0.0.0/255.0.0.0] } {   
      HTTP::redirect "http://www.NEW.com"  
    }   
  }   
  

Hopefully this helps,

Colin