D-Link DFL-2500 User Guide - Page 300
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27 CHAPTER Transparent Mode The Transparent Mode feature provided by D-Link firewalls aims at simplifying the deployment of firewall appliances into the existing network topology, to strengthen security. It helps to ease the administration work in a way that there is no need to reconfigure all the settings for the nodes within the current network, when a firewall is introduced into the communication flow. In this chapter we give you an overview of the transparent mode feature and introduce how transparent mode is implemented in D-Link firewalls in detail. Configuration examples of simple network layouts and more complicated real-life scenarios can be found at the end of this chapter. 27.1 Overview Transparency refers to the visibility of the firewall to hosts on both side of a firewall. A firewall is considered transparent to users if they do not notice the firewall in the packet flow. When adding a transparent firewall into a preexisting network structure, we achieve the following advantages for network administrators: • No reconfiguration required - clients can keep the same network configuration after the firewall has been installed. • No obstacle added - the deployment of the firewall should be invisible to the internal users, as they can still obtain the allowed sevices. 281