Destination Address; Connection Direction Examples; Lan To Wan Rules; Wan To Lan Rules - ZyXEL Communications ZyWall 35 User Manual

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ZyWALL 35 User's Guide

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?

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.

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

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.

Chapter 10 Firewall Screens