Vigor2912 Series User’s Guide
194
S
S
t
t
a
a
t
t
e
e
f
f
u
u
l
l
P
P
a
a
c
c
k
k
e
e
t
t
I
I
n
n
s
s
p
p
e
e
c
c
t
t
i
i
o
o
n
n
(
(
S
S
P
P
I
I
)
)
Stateful inspection is a firewall architecture that works at the network layer. Unlike legacy
static packet filtering, which examines a packet based on the information in its header, stateful
inspection builds up a state machine to track each connection traversing all interfaces of the
firewall and makes sure they are valid. The stateful firewall of Vigor router not just examine
the header information also monitor the state of the connection.
D
D
e
e
n
n
i
i
a
a
l
l
o
o
f
f
S
S
e
e
r
r
v
v
i
i
c
c
e
e
(
(
D
D
o
o
S
S
)
)
D
D
e
e
f
f
e
e
n
n
s
s
e
e
The
DoS Defense
functionality helps you to detect and mitigate the DoS attack. The attacks
are usually categorized into two types, the flooding-type attacks and the vulnerability attacks.
The flooding-type attacks will attempt to exhaust all your system's resource while the
vulnerability attacks will try to paralyze the system by offending the vulnerabilities of the
protocol or operation system.
The
DoS Defense
function enables the Vigor router to inspect every incoming packet based on
the attack signature database. Any malicious packet that might duplicate itself to paralyze the
host in the secure LAN will be strictly blocked and a Syslog message will be sent as warning, if
you set up Syslog server.
Also the Vigor router monitors the traffic. Any abnormal traffic flow violating the pre-defined
parameter, such as the number of thresholds, is identified as an attack and the Vigor router will
activate its defense mechanism to mitigate in a real-time manner.
The below shows the attack types that DoS/DDoS defense function can detect:
1. SYN flood attack
2. UDP flood attack
3. ICMP flood attack
4. Port Scan attack
5. IP options
6. Land attack
7. Smurf attack
8. Trace route
9. SYN fragment
10. Fraggle attack
11. TCP flag scan
12. Tear drop attack
13. Ping of Death attack
14. ICMP fragment
15. Unassigned Numbers
Below shows the menu items for Firewall.
Summary of Contents for Vigor2912 Series
Page 1: ......
Page 2: ...Vigor2912 Series User s Guide ii ...
Page 6: ...Vigor2912 Series User s Guide vi ...
Page 114: ...Vigor2912 Series User s Guide 104 This page is left blank ...
Page 188: ...Vigor2912 Series User s Guide 178 5 Click OK to save the settings ...
Page 256: ...Vigor2912 Series User s Guide 246 The items categorized under P2P ...
Page 377: ...Vigor2912 Series User s Guide 367 ...
Page 388: ...Vigor2912 Series User s Guide 378 Below shows the successful activation of Web Content Filter ...
Page 414: ...Vigor2912 Series User s Guide 404 This page is left blank ...
