Load balance on source ip address

 
  when CLIENT_ACCEPTED {  
    
      Use a local array to configure the 5 SNAT addresses  
     set snat_ips(0) 1.1.1.1  
     set snat_ips(1) 2.2.2.2  
     set snat_ips(2) 3.3.3.3  
     set snat_ips(3) 4.4.4.4  
     set snat_ips(4) 5.5.5.5  
    
      Use getfield to parse the third octet from the client IP address  
      Get the modulus of the third octet against the number of the SNAT IPs in the array  
     set snat_number [expr {[getfield [IP::client_addr] "." 3] % [array size snat_ips]}]  
     log local0. "Client IP: [IP::client_addr], SNAT number $snat_number, SNAT IP: $snat_ips($snat_number)"  
    
      Apply the SNAT  
     snat $snat_ips($snat_number)  
  }