irule to Source NAT specific IP address to avoid asymmetric routing

I added a bracket that I missed to the original answer. Also I believe you'll need to use a datagroup for this as the 'class' command operates with datagroups (see article on class). If you copy/paste the iRule I posted, you'll need to create a datagroup called "source_network".

 

Don't hard-code addresses into the iRule. "IP::client_addr" is a command (see here).

 

You can create the datagroup from TMSH as follows:

 

create ltm data-group internal source_network type ip records add { 10.250.8.0/23 }