URL hostname rewrite

Two options:

1. You could maintain a data group that maps the name to the IP. Example:

   datagroup (ex. my_server_dg):
   
   10.10.42.10 := server1.domain.com
   10.10.42.11 := server2.domain.com
   10.10.42.12 := server3.domain.com
   
   iRule:
   when HTTP_REQUEST_SEND {
       clientside {
           HTTP::header replace "Host" [class match -value [LB::server addr] equals my_server_dg]
       }
   }
   

2. If you have internal DNS you could do a quick reverse lookup to get the name.