ZyXEL Communications 5 Series User Manual

 Chapter 15 Anti-Virus Screens

ZyWALL 5/35/70 Series User’s Guide

Click SECURITY > ANTI-VIRUS > Signature to display this screen. Use this screen to 
locate signatures and manage how the ZyWALL uses them. 

Service

This field displays the services for which the ZyWALL can scan traffic for viruses. 
Select a service to be able to enable or disable anti-virus scanning on it’s traffic. 
Here are the services and default port numbers.
FTP traffic using TCP ports 20 and 21
HTTP traffic using TCP ports 80, 8080 and 3128
POP3 traffic using TCP port 110
SMTP traffic using TCP port 25
See 

 if you need to use the anti-virus scanner for FTP, 

HTTP, POP3 or SMTP traffic on custom ports.

Active

Select Active to enable the anti-virus scanner for the selected service. 

From, To

Select the directions of travel of packets that you want to check. Select or clear a 
row or column’s first check box (with the interface label) to select or clear the 
interface’s whole row or column. 
You could for example have the ZyWALL check packets traveling in from the WAN 
to the DMZ. For example, From WAN1 to DMZ and From WAN2 to DMZ.
From LAN To LAN means packets traveling from a computer on one LAN subnet 
to a computer on another LAN subnet via the LAN interface of the ZyWALL. The 
ZyWALL does not check packets traveling from a LAN computer to another LAN 
computer on the same subnet.
From WAN1 To WAN1 means packets that come in through the WAN 1 interface 
and the ZyWALL routes back out through the WAN 1 interface.
From VPN means traffic that came into the ZyWALL through a VPN tunnel and is 
going to the selected “to” interface. For example, From VPN To LAN specifies the 
VPN traffic that is going to the LAN or terminating at the ZyWALL’s LAN interface. 
The ZyWALL checks the traffic after decrypting it. 
To VPN is traffic that comes in through the selected “from” interface and goes out 
through any VPN tunnel. For example, From LAN To VPN specifies the traffic that 
is coming from the LAN and going out through a VPN tunnel. The ZyWALL checks 
the traffic before encrypting it. 
From VPN To VPN means traffic that comes in through a VPN tunnel and goes 
out through (another) VPN tunnel. This is the case when the ZyWALL is the hub in 
a hub-and-spoke VPN. The ZyWALL checks the traffic after decrypting it (before 
encrypting it again). 

Note: The VPN connection directions apply to the traffic going to or 

from the ZyWALL’s VPN tunnels. They do not apply to other 
VPN traffic for which the ZyWALL is not one of the gateways 
(VPN pass-through traffic). 

Apply 

Click Apply to save your changes. 

Reset

Click Reset to start configuring this screen again. 

Table 85   SECURITY > ANTI-VIRUS > General (continued)