Installation guide

Wireless ADSL Modem User’s Manual 77
Firewall Enable/Disable: This option enables/disables all the protection provided
on these pages.
Protection Policy
Protection Policies defend against common methods of attacking a network and
computers within the network. Some of these attacks are classified as a DoS (Denial of
Service). DoS is an attack in which a network or components of a network are disabled,
usually by overloading traffic on the network, in order to prevent authorized and
legitimate users to access network resources.
Basic Protection:
• IP Spoofing checking: IP spoofing is when an unauthorized user inserts the IP
address of an authorized user into the IP packets in order to gain access to a
network. Selecting this option will allow the firewall to check for and filter out
this discrepancy.
• Ping of Death checking: Ping of Death is a type of DoS attack that uses a
malformed ICMP data packet that contains unusually large amounts of data that
causes TCP/IP to crash or behave irregularly. Enabling this will allow the
firewall to filter out packets containing Ping of Death properties.