inteligent SNAT with iRule

Two things:

Regarding the IP::addr command - I'm not sure if this problem occurred as you typed in the rule to the forum, but you need a space between the IP::addr command and the [IP::remote_addr] command. It doesn't look like you have one... ? If this is the case, then you could be getting a rule failure which is logged to /var/log/ltm.

Regarding the snat not working - Can you give me some information about how your virtual is configured? The question I have right now is what the default action of the virtual is. Based on the way you currently have the rule, if the address doesn't match, you pick a snatpool but don't designate forwarding or a pool for load-balancing. Perhaps your rule should look like:

  
  when CLIENT_ACCEPTED {  
     if {not [IP::addr [IP::remote_addr] equals "2.2.2.0 netmask 255.255.255.0"]} {  
        use snatpool test_snat  
     }  
     forward  
  }