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Cisco ASA 5500 Series Configuration Guide using ASDM
Chapter 10 Configuring the Transparent or Routed Firewall
Firewall Mode Examples
A DMZ User Attempts to Access an Inside Host
Figure 10-7 shows a user in the DMZ attempting to access the inside network.
Figure 10-7 DMZ to Inside
The following steps describe how data moves through the ASA (see Figure 10-7):
1. A user on the DMZ network attempts to reach an inside host. Because the DMZ does not have to
route the traffic on the Internet, the private addressing scheme does not prevent routing.
2. The ASA receives the packet and because it is a new session, the ASA verifies if the packet is
allowed according to the security policy (access lists, filters, AAA).
The packet is denied, and the ASA drops the packet and logs the connection attempt.
Web Server
10.1.1.3
User
10.1.2.27
209.165.201.2
10.1.1.110.1.2.1
Outside
Inside DMZ
92402