Help with redirecting traffic over one ISP link all the time.

I have a similar scenario, but I didn't understand how I would accomplish what you were saying here.

 

 

I have the LTM connected to two different subnets. What I need is to have the responses to traffic going to VIPs on Subnet A routed back to Gateway A (regardless of what the LTM routing table says) and consequently traffic responses to traffic on Subnet B routed back to Gateway B.

 

 

Can I do this without an iRule and if so... how? Sorry, it doesn't seem intuitive to me?

 

 

(If I need an iRule, what would it look like approximately?)