ZyXEL Communications Internet Security Appliance ZyWALL5UTM 4.0 - Manual (Page 213)

ZyWALL 5/35/70 Series User’s Guide
213 Chapter 11 Firewall Screens
11.3.3.2 Service
Select the service from the Service scrolling list box. If the service is not listed, it is necessary
to first define it. See
Section 11.11.2 on page 229 for more information on predefined services.
11.3.3.3 Source Address
What is the connection’s source address; is it on the LAN, DMZ, WLAN or WAN? Is it a
single IP, a range of IPs or a subnet?
11.3.3.4 Destination Address
What is the connection’s destination address; is it on the LAN, DMZ, WLAN or WAN? Is it a
single IP, a range of IPs or a subnet?
11.4 Connection Direction Examples
This section describes examples for firewall rules for connections going from LAN to WAN
and from WAN to LAN. Rules for the WLAN or DMZ work in a similar fashion.
LAN to LAN/ZyWALL, WAN to WAN/ZyWALL, WLAN to WLAN/ZyWALL and DMZ to
DMZ/ZyWALL rules apply to packets coming in on the associated interface (LAN, WAN,
WLAN, or DMZ respectively). LAN to LAN/ZyWALL means policies for LAN-to-ZyWALL
(the policies for managing the ZyWALL through the LAN interface) and policies for LAN-to-
LAN (the policies that control routing between two subnets on the LAN). Similarly, WAN to
WAN/ZyWALL, WLAN to WLAN/ZyWALL and DMZ to DMZ/ZyWALL polices apply in
the same way to the WAN and DMZ ports.
11.4.1 LAN To WAN Rules
The default rule for LAN to WAN traffic is that all users on the LAN are allowed non-
restricted access to the WAN. When you configure a LAN to WAN rule, you in essence want
to limit some or all users from accessing certain services on the WAN. See the following
figure.