Netopia R7200 - Manual (Page 185)

Security 14-35
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 R7200. 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.
Since the Source IP Network Address in the Netopia R7200 is 01100000, and the source IP address after the
logical AND is 1011000, this rule does not match and this packet will be for warded.
Example 4
Incoming packet has the source address of 200.1.1.104.
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)
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
255.255.255.240 11110000 (Per form the logical AND)
01100000 (Logical AND result)