ZyWALL User's Guide

Chapter 11 Firewall
ZyWALL 2 Plus User’s Guide
194
By default, the ZyWALL allows packets traveling in the following directions.:
By default, the ZyWALL drops packets traveling in the following directions.
• LAN to LAN These rules specify which computers on the LAN can manage the
ZyWALL (remote management) and communicate between networks or
subnets connected to the LAN interface (IP alias).
" You can also configure the remote management
settings to allow only a specific computer to
manage the ZyWALL.
• LAN to WAN These rules specify which computers on the LAN can access which
computers or services connected to the WAN. See Section 11.5 on page
200 for an example.
• WAN to LAN These rules specify which computers connected to the WAN can
access which computers or services on the LAN. For example, you
may create rules to:
• Allow certain types of traffic, such as Lotus Notes database
synchronization, from specific hosts on the Internet to specific
hosts on the LAN.
• Allow public access to a Web server on your protected network.
You could also block certain IP addresses from accessing it.
" You also need to configure NAT port forwarding
(or full featured NAT address mapping rules) to
allow computers on the WAN to access devices
on the LAN. See Section 17.5.3 on page 341 for
an example.