Installation guide

Trend Micro™ InterScan™ Web Security Virtual Appliance 6.5 Installation Guide

2-10

FTP requests follow this sequence:

1. The FTP client sends a request to the IWSVA FTP service.

2. The IWSVA FTP service validates the request (for example, the file type is not

blocked). If the request is valid, the IWSVA FTP service relays it to the other FTP

proxy or the FTP server being protected by IWSVA.

3. The FTP server on the Internet responds to the request, ideally with the requested

file.

4. The IWSVA FTP service scans the returned data for unwanted content. If it finds

any unwanted content, it returns an appropriate message to the FTP client.

Otherwise, it returns the requested data to the FTP client.

IGURE

2-4.

FTP Proxy in Dependent Mode

Deploying in Forward Proxy Mode

Overview of Forward Proxy Mode

There are two kinds of Forward Proxy: transparent and non-transparent. Transparent

proxy can be achieved by a Layer 4 switch (Simple Transparency) or a WCCP-enabled

switch (WCCP mode).