Siemens 5881 - Manual (Page 65)

SIEMENS 5881 Broadband Internet Router
User’s Guide Chapter 6 Security Setup
Stateful Firewall
SIEMENS 59
Stateful Firewall
Stateful Firewall varies from the IP Filtering Firewall in that it gathers and maintains state information about
each session.
IP Filtering Firewall examines the packet’s header information and matches it against a set of defined rules. If
it finds a match, the corresponding action is performed. If not, the packet is accepted.
Stateful firewall intercepts outgoing packets and gathers information from them (for example IP address
information, port number) to create state information for that session. When an incoming packet is received,
the Stateful Firewall checks the packet against the state information it has maintained and accepts the packet
if the packet belongs to the session. By default, the firewall is disabled, and your system is vulnerable until this
feature is enabled.
This section describes how to perform the following tasks.
Configure Stateful Firewall Configure settings that control how the Stateful Firewall
performs.
Dropped Packets View the most recent dropped packets.
Firewall Rules Configure Stateful Firewall rules.