1 how the prestige virus scan works, 2 limitations of the prestige packet scan – ZyXEL Communications 662HW Series User Manual
Page 206
Prestige 662H/HW Series User’s Guide
Chapter 17 Anti-Virus Packet Scan
206
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.
17.3.1 How the Prestige Virus Scan Works
The following describes the virus scanning process on the Prestige.
1 The Prestige first identifies the packet types (SMTP, POP3, HTTP and FTP through
standard ports only) 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).
17.3.2 Limitations of the Prestige Packet Scan
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