Trend Micro InterScan M Series, Administrator'S Manual

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Deployment Options
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When a client initiates a request, the request passes through the switch that is the
default gateway for clients in this segment. The appliance accepts the request through
the INT port, which redirects traffic to the corresponding proxy handler. After the
proxy handler processes the request, the appliance delivers the packet to the
destination server through the router (the default gateway of the appliance).
WARNING! The connection may be lost if the default gateway IP address of InterScan
Gateway Security Appliance is deployed behind the appliance.
In this mode, the source IP address is that of the InterScan Gateway Security
Appliance and the destination IP address is that of the destination server. The
appliance works in Layer 3 and has no knowledge of Layer 2 behavior.
Fully Transparent Proxy Mode
The appliance enforces full transparency through the following behaviors:
• Clients/destination servers do not see the presence of additional filters/scanners
unless a violation is detected.
• Administrators do not need any additional configuration on the client side.