Once connected to the ASA with ASDM the Home button in the top left of the window should be selected, and the Device Dashboard shown. To start, we need to confirm the firewall is in routed mode, this is on by default, but still worth checking. We need to allow HTTP and HTTPS from the DMZ web server to the Internet, but the DMZ database server must be protected. Our test network is setup as follows:Ī Cisco ASA with four interfaces in use, one connected to the Internet, one connected to a LAN switch, one connected to a DMZ web server, and one with a DMZ database server. We will focus on port forwarding on a Cisco ASA configured in routed mode, using a Bridged Virtual Interface (BVI), using Cisco’s ASDM GUI administration tool. Sometimes these services are on dedicated IP addresses, other times the addresses are shared and mostly using some type of Network Address Translation (NAT). The ability to provide a service to the Internet requires being able to forward ports from one interface of a firewall to another interface. Port forwarding is a critical feature of any network firewall.
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