Yes, it is possible, even if that subnet is not configured in the CSM, the way how the CSM is going to send the traffic to those servers in 20.20.20.X subnet would be through the CSM default gateway, because the rserver belongs to an "unknown" subnet.
After that the CSM GW should not how to route the packets to those rservers.
In this scenario you will need to use nat client so the rserver will return the answer back to the CSM so it can complete the bidirectional connection in order to the VIP to answer to the client.
Introduction This article will help you understand the steps on how to
download the UCS licenses from the Cisco Systems website and then
installing it on the UCS. The redacted (blue lines) just covers up
certain numbers for privacy please do not take them...
Introduction This article will help you understand and educate the
customer on how to clear their "expired licenses"
(license-graceperiod-expired) from their UCS-M. If a customer just
purchased a license and needs a step by step guide on how to download
Introduction Prepositioning is a powerful tools on the WAAS platform but
it is not always easy to figure out why your jobs are failing when
trying to retrieve the files.Here is a method that should help you to
figure out the reason why they are not succes...