Mapping 1 public IP to 2 Internal IP's
Posted on 2009-12-16
We have a cisco ASA firewall protecting an MS 2003 Exchange server in a private network. We use external SMTP smarthosts to forward our e-mals. All these smarthosts are currently being pointed at our public IP address which in turn is being statically Nated to the private IP address of the Exchange server.
We have added a new MS 2007 Exchange server to the mix (same subnet). Both servers are in migration mode.
What I want to know is:
What is the best practice to allow this to work. Can I do a NAT rule that will allow the same public IP address to point to an additional private IP address (the exchange 2007 server)
Current NAT entry:
Static Exchange-2003-172.16.1.1 outside 220.127.116.11