Connection Direction Examples - ZyXEL Communications ZyXEL ZyWALL 2WE User Manual

ZyWALL 2 and ZyWALL 2WE
Once these questions have been answered, adding rules is simply a matter of plugging the information into
the correct fields in the web configurator screens.
16.2.3 Key Fields For Configuring Rules
Action
Should the action be to Block or Forward?
"Block" means the firewall silently discards the packet.
Service
Select the service from the Service scrolling list box. If the service is not listed, it is necessary to first define
it. See section 16.5 for more information on predefined services.
Source Address
What is the connection's source address; is it on the LAN or WAN? Is it a single IP, a range of IPs or a
subnet?
Destination Address
What is the connection's destination address; is it on the LAN or WAN? Is it a single IP, a range of IPs or a
subnet?

16.3 Connection Direction Examples

This section describes examples for firewall rules for connections going from LAN to WAN and from WAN
to LAN.
LAN to LAN/ZyWALL and WAN to WAN/ZyWALL rules apply to packets coming in on the associated
interface (LAN or WAN 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 polices apply in
the same way to the WAN port.
16.3.1 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.
Creating Custom Rules 16-3