ZyXEL Communications ZyXEL ZyAIR 100 - Manual (Page 162)

ZyWALL 10~100 Series Internet Security Gateway
12-4 Firewall Screens
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?
12.4 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.
12.4.1 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 12-1 LAN to WAN Traffic