Netopia Firmware 4000-Series Software Manual page 267

255.255.255.240
Since the Source IP Network Address in the Router is 01100000, and the source IP address after the logical
AND is 1011000, this rule does not match and this packet will be forwarded.
Example 4
Filter Rule:
Incoming packet has the source address of 200.1.1.104.
IP Address
200.1.1.104
AND
255.255.255.240
Since the Source IP Network Address in the Router is 01100000, and the source IP address after the logical
AND is 01100000, this rule does match and this packet will not be forwarded.
Example 5
Filter Rule:
Incoming packet has the source address of 200.1.1.96.
IP Address
200.1.1.96
AND
11110000
10110000
200.1.1.96
255.255.255.240
Forward = No
Binary Representation
01101000
11110000
01100000
200.1.1.96
255.255.255.255
Forward = No
Binary Representation
01100000
(Perform the logical AND)
(Logical AND result)
(Source IP Network Address)
(Source IP Mask)
(What happens on match)
(Source address in incoming IP packet)
(Perform the logical AND)
(Logical AND result)
(Source IP Network Address)
(Source IP Mask)
(What happens on match)
(Source address in incoming IP packet)
Security 10-43