ZyXEL Communications ZyXEL ZyWALL 35 - Manual (Page 190)

ZyWALL 35 User’s Guide
188 Chapter 10 Firewall Screens
10.3.3.4 Destination Address
What is the connection’s destination address; is it on the LAN, DMZ or WAN? Is it a single
IP, a range of IPs or a subnet?
10.4 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 DMZ work in a similar fashion.
LAN to LAN/ZyWALL, WAN to WAN/ZyWALL and DMZ to DMZ/ZyWALL rules apply
to packets coming in on the associated interface (LAN, WAN, 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 and DMZ to
DMZ/ZyWALL polices apply in the same way to the WAN and DMZ ports.
10.4.1 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.
Figure 74 LAN to WAN Traffic
10.4.2 WAN To LAN Rules
The default rule for WAN to LAN traffic blocks all incoming connections (WAN to LAN). If
you wish to allow certain WAN users to have access to your LAN, you will need to create
custom rules to allow it.
See the following figure.