User`s guide

Chapter 15 Firewalls
P-2602HWUDL-D User’s Guide
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By default, the ZyXEL Device’s stateful packet inspection allows packets traveling in the
following directions:
• LAN to LAN/ Router
These rules specify which computers on the LAN can manage the ZyXEL Device (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 ZyXEL Device.
• LAN to WAN
These rules specify which computers on the LAN can access which computers or services
on the WAN.
By default, the ZyXEL Device’s stateful packet inspection drops packets traveling in the
following directions:
•WAN to LAN
These rules specify which computers on the WAN can access which computers or services
on the LAN.
" 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.
•WAN to WAN/ Router
By default the ZyXEL Device stops computers on the WAN from managing the ZyXEL
Device or using the ZyXEL Device as a gateway to communicate with other computers on
the WAN. You could configure one of these rules to allow a WAN computer to manage the
ZyXEL Device.
" You also need to configure the remote management settings to allow a WAN
computer to manage the ZyXEL Device.
You may define additional rules and sets or modify existing ones but please exercise extreme
caution in doing so.
For example, you may create rules to:
• Block certain types of traffic, such as IRC (Internet Relay Chat), from the LAN to the
Internet.