The Firewall Screen - ZyXEL Communications AMG1001-T Series User Manual

LAND Attack
In a LAND attack, hackers flood SYN packets into the network with a spoofed source IP address of
the target system. This makes it appear as if the host computer sent the packets to itself, making
the system unavailable while the target system tries to respond to itself.
Ping of Death
Ping of Death uses a "ping" utility to create and send an IP packet that exceeds the maximum
65,536 bytes of data allowed by the IP specification. This may cause systems to crash, hang or
reboot.
SPI
Stateful Packet Inspection (SPI) tracks each connection crossing the firewall and makes sure it is
valid. Filtering decisions are based not only on rules but also context. For example, traffic from the
WAN may only be allowed to cross the firewall in response to a request from the LAN.

13.2 The Firewall Screen

Use this screen to enable firewall and/or SPI. Click Advanced Setup > Firewall to display the
following screen.
Figure 44 Advanced Setup > Firewall
The following table describes the labels in this screen.
Table 32 Advanced > Firewall
LABEL
Firewall
SPI
SAVE
CANCEL
Enabling SPI blocks all traffic initiated from the WAN side, including the
DMZ, virtual server and ACL on the WAN side.
AMG1001-T/AMG1011-T Series User's Guide
DESCRIPTION
Use this field to enable or disable firewall on your AMG1001-T/AMG1011-T.
Use this field to enable or disable SPI on your AMG1001-T/AMG1011-T.
Click this to save your changes.
Click this to restore your previously saved settings.
Chapter 13 Firewall
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