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12 Introduction
Firewall
The integrated Stateful Inspection Firewall ensures an effective protection against undesi-
red intrusion in your network by permitting only incoming data traffic as reaction to out-
going data traffic. The router’s IP masquerading function hides all workstations of the LAN
behind a single public IP address. The actual identities (IP addresses) of the individual
workstations remain concealed. Firewall filters of the router permit specific IP addresses,
protocols and ports to be blocked. With MAC address filters it is also possible to specifi-
cally monitor the access of workstations in the LAN to the IP routing function of the device.
Further important features of the Firewall are
Intrusion Detection
Break-in attempts into the local network or on the central Firewall are recognized,
repelled and logged by the Intrusion Detection system (IDS) of the Business LAN
R800+. Thereby it can be selected between logging within the device, email notifica-
tion, SNMP trap or SYSLOG alarms.
Denial-of-Service Protection
Attacks from the Internet can be break-in attempts as well as attacks with the aim of
blocking the accessibility and functionality of individual services. Therefore a Busi-
ness LAN R800+ is equipped with appropriate protective mechanisms, which recog-
nize well-known hacker attacks and which guarantee the functionality.
Quality-of-Service / Traffic management
The generic term Quality-of-Service (brief: QoS) summarizes the functions of the
device which guarantee certain service qualities. The advantage is that the QoS func-
tions can take place by means of the existing powerful classification methods of the
Firewall (e.g. limitation of subnetworks, single workstations or certain services).
Guaranteed minimum bandwidths give priority to enterprise critical applications, VoIP
PBX installations or certain user groups.
Note More details about the function of the Stateful Inspection Firewall of your
Router can be found in the reference manual on the CD.
Firewall
Internet
LAN
Business LAN
R800+
12


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