Thanks,
Going further,
1. On Firewall I have to NAT only Reverse Proxy server IP with public IP. ( 10.10.1.1 NATED to 200.10.10.1)
2. Register 2 A-Records binding to single Public IP. (eg. 200.10.10.1) in ISP DNS.
3. Open the required ports on the firewall. (Here I feel issue, as both the "sap.company.com" and "apps.company.com" will run on port-80 as seen from external world).
From my home PC, I will type following :
To Access SAP : http://sap.company.com ( Public IP - 200.10.10.1 ; Internal IP - 10.1.1.1)
To Access Application : http://apps.company.com ( Public IP - 200.10.10.1 ; Internal IP - 10.1.1.2)
Both will resolve to the same public IP address and the request will hit our Firewall, and firewall will direct the same to reverse proxy (with internal IP address 10.10.1.1 in DMZ).
Will reverse proxy redirect the SAP request to 10.1.1.1 on port-80 (which is IP address of loadbalancer SAP Portal ) and application request to 10.1.1.2 on port-80 (which is IP address of Web-Server (IIS etc) ?
Hope setup will work with SSL by changing the ports to 443 and installing digital certificates on web-servers.
Regards,
Sachin