21

Anti-Virus

This chapter introduces and shows you how to configure the anti-virus scanner.

21.1 Anti-Virus Overview

A computer virus is a small program designed to corrupt and/or alter the operation of other legitimate programs. A worm is a self-replicating virus that resides in active memory and duplicates itself. The effect of a virus attack varies from doing so little damage that you are unaware your computer is infected to wiping out the entire contents of a hard drive to rendering your computer inoperable.

21.2 Anti-virus Commands

The following table identifies the values required for many of these commands. Other input values are discussed with the corresponding commands.

Table 91 Input Values for General Anti-Virus Commands

LABELDESCRIPTION

zone_object The name of the zone. For the ZyWALL USG 300 and above, use up to 31 characters (a- zA-Z0-9_-). The name cannot start with a number. This value is case-sensitive.

The ZyWALL USG 200 and lower models use pre-defined zone names like DMZ, LAN1,

SSL VPN, WLAN, IPSec VPN, OPT, and WAN.

av_file_pattern Use up to 80 characters to specify a file pattern. Alphanumeric characters, underscores

(_), dashes (-), question marks (?) and asterisks (*) are allowed.

A question mark (?) lets a single character in the file name vary. For example, use “a?.zip” (without the quotation marks) to specify aa.zip, ab.zip and so on.

Wildcards (*) let multiple files match the pattern. For example, use “*a.zip” (without the quotation marks) to specify any file that ends with “a.zip”. A file named “testa.zip” would match. There could be any number (of any type) of characters in front of the “a.zip” at the end and the file name would still match. A file named “test.zipa” for example would not match.

A * in the middle of a pattern has the ZyWALL check the beginning and end of the file name and ignore the middle. For example, with “abc*.zip”, any file starting with “abc” and ending in “.zip” matches, no matter how many characters are in between.

The whole file name has to match if you do not use a question mark or asterisk.

If you do not use a wildcard, the ZyWALL checks up to the first 80 characters of a file name.

 

173

ZyWALL (ZLD) CLI Reference Guide