Change outgoing NAT

Hi,

 

 

Looking for the irule that can change the outgoing IP address based on destination, I've seen it but can't find it anymore.

 

 

 

Background: We have multiple local subnets which we use currently use for outgoing connections. We need to migrate this to an F5 LC but can't use the standard (S)NAT. Later this will be moved to BGP to allow us to provide only one entry to vendors as our originating address.

 

 

 

Thanks for any help.