Load balance on source ip address

  when HTTP_REQUEST {  
    
      Use a local array to configure the 4 pools 
     set pool_choice(0) pool_1 
     set pool_choice(1) pool_2 
     set pool_choice(2) pool_3 
     set pool_choice(3) pool_4 
     
    
      Use getfield to parse the third octet from the client IP address  
      Get the modulus of the third octet against the pool members in the array  
     set pool_number [expr {[getfield [IP::client_addr] "." 3] % [array size pool_choice]}]  
     log local0. "Client IP: [IP::client_addr], Pool number $pool_number, Pool Choice: $pool_choice($pool_choice)"  
    
      choose a pool
     pool $pool_choice($pool_number)  
  }