Example 2, Example 3 – Netopia R2121 User Manual
Page 197
Security 14-35
This incoming IP packet has a source IP address that matches the network address in the Source IP Address
field (00000000) in the Netopia R2121. This will NOT for ward this packet.
Example 2
Incoming packet has the source address of 200.1.1.184
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 R2121. This rule WILL for ward this packet because the
packet does not match.
Example 3
Incoming packet has the source address of 200.1.1.184
Filter Rule:
200.1.1.0
(Source IP Network Address)
255.255.255.128
(Source IP Mask)
For ward = No
(What happens on match)
IP Address
Binar y Representation
200.1.1.184
10111000
(Source address in incoming IP packet)
AND
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
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)