V-1 Firewall
V-1 Firewall
While the broadband users demand more bandwidth for multimedia, interactive
applications, or distance learning, security has been always the most concerned. The
firewall of the Vigor router helps to protect your local network against attack from
unauthorized outsiders. It also restricts users in the local network from accessing the
Internet. Furthermore, it can filter out specific packets that trigger the router to build an
unwanted outgoing connection.
Firewall Facilities
Firewall Facilities
The users on the LAN are provided with secured protection by the following firewall
facilities:
User-configurable IP filter (Call Filter/ Data Filter).
Stateful Packet Inspection (SPI): tracks packets and denies unsolicited incoming data
Selectable Denial of Service (DoS) /Distributed DoS (DDoS) attacks protection
IP Filter
IP Filter
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Depending on whether there is an existing Internet connection, or in other words “the WAN
link status is up or down”, the IP filter architecture categorizes traffic into two: Call Filter
and Data Filter.
Call Filter - When there is no existing Internet connection, Call Filter is applied to all
traffic, all of which should be outgoing. It will check packets according to the filter
rules. If legal, the packet will pass. Then the router shall “initiate a call” to build the
Internet connection and send the packet to Internet.
Data Filter - When there is an existing Internet connection, Data Filter is applied to
incoming and outgoing traffic. It will check packets according to the filter rules. If
legal, the packet will pass the router.
The following illustrations are flow charts explaining how router will treat incoming traffic
and outgoing traffic respectively.
Vigor2762 Series User’s Guide
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