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Chapter 11 Firewall
ZyWALL 2WG User’s Guide
242
11.3 Packet Direction Examples
Firewall rules are grouped based on the direction of travel of packets to which they apply. This
section gives some examples of why you might configure firewall rules for specific
connection directions.
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
1
These rules specify which computers on the LAN can access which
computers or services connected to WAN 1. See Section 11.5 on page
248 for an example.
• WAN 1 to LAN These rules specify which computers connected to WAN 1 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 395 for
an example.