Netopia D3232 IDSL User Manual
Page 76
8-76 User’s Reference Guide
This incoming IP packet (10000000) has a source IP address that does not match the network address in the
Source IP Address field (00000000) in the Netopia D-Series. This rule will for ward this packet because the
packet does not match.
E
E
E
Exxxxaa
a
am
m
m
mp
p
p
pllllee
e
e 3
3
3
3
Incoming packet has the source address of 200.1.1.184.
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 1011000, this rule does not match and this packet will be passed.
E
E
E
Exxxxaa
a
am
m
m
mp
p
p
pllllee
e
e 4
4
4
4
Incoming packet has the source address of 200.1.1.104.
255.255.255.128
10000000
(Per form the logical AND)
10000000
(Logical AND result)
Filter Rule:
200.1.1.96
(Source IP Network Address)
255.255.255.240
(Source IP Mask)
For ward = No
(What happens on match)
IP Address
Binar y Representation of
last byte
200.1.1.184
10111000
(Source address in incoming IP packet)
AND
255.255.255.240
11110000
(Per form the logical AND)
10110000
(Logical AND result)
Filter Rule:
200.1.1.96
(Source IP Network Address)
255.255.255.240
(Source IP Mask)
For ward = No
(What happens on match)
IP Address
Binar y Representation
200.1.1.104
01101000
(Source address in incoming IP packet)
AND