Network forensics is a subtopic of digital forensics wherein research on artifact investigations and intrusions evidence acquisition is addressed. Among many challenges in the field, the problem of losing data artifacts in the state of flux, (i.e., live volatile data), when network devices are suddenly non-operational remains a topic of interest to many investigators. This paper is to simulate an SQL injection attack scenarios in a complex network environment. They designed and simulated a typical De-Militarized Zone (DMZ) network environment using Graphical Network Simulator 3 (GNS3), virtual box and VMware workstation.