Fortinet 100A - Manual (Page 224)

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01-28007-0068-20041203 Fortinet Inc.
Protection profile options Firewall
Configuring antivirus options
Figure 106:Protection profile antivirus options
The following options are available for antivirus through the protection profile. See
“Antivirus” on page 289 for more antivirus configuration options.
Virus Scan Enable or disable virus scanning (for viruses and worms) for each
protocol (HTTP, FTP, IMAP, POP3, SMTP). Grayware, if enabled in
Antivirus > Config > Config, is included with the Virus Scan.
Heuristic, if enabled in the CLI, is also included with the Virus Scan.
File Block Enable or disable file pattern blocking for each protocol. You can
block files by name, by extension, or any other pattern, giving you
the flexibility to block files that may contain harmful content.
Quarantine (models with
local disk only) Enable or disable quarantining for each protocol. You can
quarantine suspect files to view them or submit files to Fortinet for
analysis.
Pass fragmented emails Enable or disable passing fragmented email for mail protocols
(IMAP, POP3, SMTP). Fragmented email cannot be scanned for
viruses.
Oversized file/email Select block or pass for files and email that exceed configured
thresholds for each protocol. To configure the oversized file
threshold, go to Antivirus > Config > Config. The maximum
threshold for scanning in memory is 10% of the FortiGate unit RAM.
Note: For email scanning, the oversize threshold refers to the final
size of the email after encoding by the email client, including
attachments. Email clients may use a variety of encoding types and
some encoding types translate into larger file sizes than the original
attachment. The most common encoding, base64, translates 3
bytes of binary data into 4 bytes of base64 data. So a file may be
blocked or logged as oversized even if the attachment is several
megabytes less than the configured oversize threshold.
Add signature to
outgoing emails Create and enable a signature to append to outgoing email (SMTP
only).