Secure Computing SG300 User Manual page 190

Check Enable.
The Database mirror is the host from which the signature database is updated. Unless
there is a specific host from which you want the SnapGear unit to retrieve signature
updates, leave this at the default setting of database.clamav.net.
Select the frequency to Check for updates from the database mirror. The checks are
quick and shouldn't cause a noticeable decrease to performance unless an update is
necessary.
Enable Check for updates when networking starts to force a virus signature update
when the status of the network changes, e.g. when the Internet connection comes online.
This guarantees a virus signature update when the SnapGear unit boots.
Specify the Maximum size in kilobytes of files to scan for viruses. Files over this size are
automatically rejected.
You may Treat encrypted content as viruses – as the SnapGear unit is not the
intended receipient, it does not decrypt encrypted content passing through it, and cannot
determine whether such content is infected.
Specify the Maximum number of simultaneous virus checks to perform. Permitting
more scans increases the amount of memory and CPU resources required by the
antivirus scanning.
Click Submit.
Storage
It is recommended that you use a network or local share to provide storage for the virus
database and temporary space for the scanning process. This greatly increases the
effectiveness of the antivirus scanner.
Network share
A network share is a shared folder or drive on a local Windows PC, or a PC running
another operating system capable of SMB sharing (such as Mac OS X, or a Linux PC
running the SAMBA service).
Refer to your operating system's documentation for details on creating a network share.
What follows are some basic instructions for creating a network share under Windows
XP.
Firewall
184