VigorBX 2000 Series User’s Guide
390
V
V
I
I
-
-
1
1
F
F
i
i
r
r
e
e
w
w
a
a
l
l
l
l
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.
F
F
i
i
r
r
e
e
w
w
a
a
l
l
l
l
F
F
a
a
c
c
i
i
l
l
i
i
t
t
i
i
e
e
s
s
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
I
I
P
P
F
F
i
i
l
l
t
t
e
e
r
r
s
s
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.
Summary of Contents for VigorBX 2000 Series
Page 1: ......
Page 12: ......
Page 62: ...VigorBX 2000 Series User s Guide 50 This page is left blank ...
Page 122: ...VigorBX 2000 Series User s Guide 110 ...
Page 145: ...VigorBX 2000 Series User s Guide 133 ...
Page 163: ...VigorBX 2000 Series User s Guide 151 ...
Page 180: ...VigorBX 2000 Series User s Guide 168 ...
Page 222: ...VigorBX 2000 Series User s Guide 210 This page is left blank ...
Page 248: ...VigorBX 2000 Series User s Guide 236 This page is left blank ...
Page 330: ...VigorBX 2000 Series User s Guide 318 This page is left blank ...
Page 419: ...VigorBX 2000 Series User s Guide 407 ...
Page 428: ...VigorBX 2000 Series User s Guide 416 The items categorized under OTHERS ...
Page 454: ...VigorBX 2000 Series User s Guide 442 This page is left blank ...
Page 467: ...VigorBX 2000 Series User s Guide 455 ...
Page 532: ...VigorBX 2000 Series User s Guide 520 This page is left blank ...
Page 574: ...VigorBX 2000 Series User s Guide 562 This page is left blank ...
Page 597: ...VigorBX 2000 Series User s Guide 585 ...
Page 604: ...VigorBX 2000 Series User s Guide 592 ...
Page 608: ...VigorBX 2000 Series User s Guide 596 ...
Page 610: ...VigorBX 2000 Series User s Guide 598 This page is left blank ...