thanks
Yes it is not possible to used SNAT since my clients IP Address will be masked & my proxy will see only the VIP of the LTM.
But would like to understand why LTM will not allow my traffic if the return traffic is not through them.
Traffic flow will be like this
Client IP -> VIP LTM -> Proxy Physical IP -> Initial Traffic
Proxy Physical IP --> Client IP -> Return Traffic
Client IP -> VIP LTM -> Proxy Physical IP -> Subsequent Traffic
Would like to understand why LTM will not allow the subsequent traffic to pass through.
What parameters it checks or what features it checks for this.