irule with source IP

A very basic implementation might look something like this:

1. Define an address-based data group. Example (my_ip_datagroup):

   10.10.10.10 := 192.168.42.10 80
   10.10.10.11 := 192.168.42.11 80
   10.10.10.12 := 192.168.42.12 80
   ...
   

2. Create an iRule:

   when CLIENT_ACCEPTED {
       if { [class match [IP::client_addr] equals my_ip_datagroup] } {
           node [class match -value [IP::client_addr] equals my_ip_datagroup]
       }
   }