Netopia D7100 SDSL 用户手册
Security 8-77
Since the Source IP Network Address in the Netopia D-Series’s filter rule is 01100000 (=96 decimal), and the
source IP address after the logical AND is 01100000, this rule does match and this packet will not be passed.
source IP address after the logical AND is 01100000, this rule does match and this packet will not be passed.
E
E
E
Exxxxaa
a
am
m
m
mp
p
p
pllllee
e
e 5
5
5
5
Incoming packet has the source address of 200.1.1.96.
Since the Source IP Network Address in the Netopia D-Series is 01100000, and the source IP address after the
logical AND is 01100000, this rule does match and this packet will NOT be passed. This rule masks off a
single IP address.
logical AND is 01100000, this rule does match and this packet will NOT be passed. This rule masks off a
single IP address.
W
W
W
Wo
o
o
orrrrkk
k
kiiiin
n
n
ng
g
g
g w
w
w
wiiiitttth
h
h
h FFFFiiiillllttttee
e
errrrssss aa
a
an
n
n
nd
d
d
d ffffiiiillllttttee
e
errrr ssssee
e
ettttssss
This section covers Filters and filter sets.
To work with filters and filter sets, begin by accessing the filter set screens.
Note: Make sure you understand how filters work before attempting to use them. Read the section
.
255.255.255.240
11110000
(Per form the logical AND)
01100000
(Logical AND result)
Filter Rule:
200.1.1.96
(Source IP Network Address)
255.255.255.255
(Source IP Mask)
For ward = No
(What happens on match)
IP Address
Binar y Representation
200.1.1.96
01100000
(Source address in incoming IP packet)
AND
255.255.255.255
11111111
(Per form the logical AND)
01100000
(Logical AND result)
Main
Menu
System
Configuration
Filter
Sets