I will show you my config first for quick understanding
Cisco ASA: 192.168.1.1
Inside network: 192.168.2.*
Cisco ASA 5512-X with WAN IP configured on the WAN Port. We have 5 public IP addresses from our ISP
(let's say for example 10.10.10.41 - 10.10.10.46)
We have a Netgear Router behind our ASA because of Wifi Guest access. We assigned one of our public IP addresses (10.10.10.42) to that Netgear router (connected on the WAN port of the Netgear) and configured a NAT object in our ASA for this router. With a NAT rule to this NAT object we create the portforwarding for the different ports as needed (videoconferencing, Lync etc.). In the Netgear we also open the same ports and assign them to the right local IP addresses.
At this point everything is working great. Even with 2 "firewalls" behind each other with port forwarding (I know it's not the ideal situation).
I configured a Lync Edge server and a Reverse Proxy (2 NIC's) and I want to assign one of my Public IP addresses to that Reverse Proxy. We created public DNS A records (meet, lyncweb, lyncdiscover and dialin) who points to 10.10.10.43. It should be looking like this:
External User 10.10.10.43 --> RP Ext. NIC --> RP Int. NIC --> Lync server
As you can read and see I want to configure the 10.10.10.43 public IP address on my ASA to it can be (NAT) translated to the local IP address of the Reverse Proxy (RP) external NIC. This is a 192.168.2.* address.
How do I configure this on my ASA? Is it a problem the ASA is not in the same network as my local range?