User`s guide

ZyXEL MAX-200M1 Series User’s Guide
Chapter 12 Firewall 133
Blocked LAN-to-WAN packets are considered alerts. Alerts are “higher priority logs” that
include system errors, attacks and attempted access to blocked web sites. Alerts appear in red
in the View Log screen. You may choose to have alerts e-mailed immediately in the Log
Settings screen.
LAN-to-LAN/ZyXEL Device means the LAN to the ZyXEL Device LAN interface. This is
always allowed, as this is how you manage the ZyXEL Device from your local computer.
12.1.4.2 WAN-to-LAN rules
WAN-to-LAN rules are Internet to your local network firewall rules. The default is to block
all traffic from the Internet to your local network.
How can you forward certain WAN to LAN traffic? You may allow traffic originating from the
WAN to be forwarded to the LAN by:
• Configuring NAT port forwarding rules.
• Configuring One-to-One and Many-One-to-One NAT mapping rules in the SMT NAT
menus.
• Configuring WAN or LAN & WAN access for services in the Remote Management
screens or SMT menus. When you allow remote management from the WAN, you are
actually configuring WAN-to-WAN/ZyXEL Device firewall rules. WAN-to-WAN/
ZyXEL Device firewall rules are Internet to the ZyXEL Device WAN interface firewall
rules. The default is to block all such traffic. When you decide what WAN-to-LAN
packets to log, you are in fact deciding what WAN-to-LAN and WAN-to-WAN/ZyXEL
Device packets to log.
Forwarded WAN-to-LAN packets are not considered alerts.
12.2 Triangle Route
When the firewall is on, your ZyXEL Device acts as a secure gateway between your LAN and
the Internet. In an ideal network topology, all incoming and outgoing network traffic passes
through the ZyXEL Device to protect your LAN against attacks.
Figure 73 Ideal Firewall Setup