Wireless ADSL Modem User’s Manual
76
C H A P T E R 8
FIREWALL CONFIGURATION
A Statefull Packet Inspection (SPI) firewall is an optional feature that may or
may not be included in your ADSL Bridge/Router.
A firewall is a method of implementing common as well as user defined security
policies in an effort to keep intruders out. Firewalls work by analyzing and filtering
out IP packets that violate a set of rules defined by the firewall administrator. The
firewall is located at the point of entry for the network. All data inbound and
outbound must pass through the firewall for inspection.
Advanced Options:
This section contains options for protecting against particular
wellknown attacks as well as documenting those attacks as they occur.
Firewall Databases:
This section allows you to create groups based on IP addresses,
subnet masks, ports, and time. These groups are used when creating inbound and
outbound policies.
Inbound/Outbound Policies:
This section allows you to create rules for incoming
and outgoing IP packets. The IP packets are compared against the rules and are
allowed or denied accordingly.