ZyXEL p-662h-61 Guia Do Utilizador

Prestige 662HW Series User’s Guide

Chapter 17 Anti-Virus Packet Scan

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This is an Internet file transfer service that operates on the Internet and over TCP/IP 
networks. A system running the FTP server accepts commands from a system running an 
FTP client. The service allows users to send commands to the server for uploading and 
downloading files. 

The following describes the virus scanning process on the Prestige. 

1 The Prestige first identifies the packet types (SMTP, POP3, HTTP and FTP) from the 

network traffic. 

2 If the packets are not session connection setup packets (such as SYN, ACK and FIN), the 

Prestige records the sequence of the packets.

3  The scanning engine scans the content of the packet for virus. 

4 If a virus pattern is matched, the Prestige “cleans” the virus by deleting the infected 

packet and alerts the intended computer user(s). 

The Prestige does not scan the following types of file  for virus:

• Compressed or zipped files

• Simultaneous file downloads (for example, when you use the FlashGet download 

program).  

• When a virus is detected, an alert message is displayed in Miscrosoft Windows-based  

operation systems only.

2

 

Note: The anti-virus packet scan on the Prestige offers the first defense 
against possible virus attacks on your network. It is not a replacement of the 
anti-virus client software that you may install on network computers.

Note: Since the Prestige “destroys” a file by deleting the infected portion of 
the file content, you cannot open the file. 

2.

For Windows 98/Me, refer to the