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Security 11-27
Example 4
Incoming packet has the source address of 200.1.1.104.
Since the Source IP Network Address in the Netopia 4541/4542 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
Incoming packet has the source address of 200.1.1.96.
Since the Source IP Network Address in the Netopia 4541/4542 is 01100000, and the source IP address after
the logical AND is 01100000, this rule does match and this packet will not be forwarded. This rule masks off a
single IP address.
Filter Rule: 200.1.1.96 (Source IP Network Address)
255.255.255.240 (Source IP Mask)
Forward = No (What happens on match)
IP Address Binary Representation
200.1.1.104 01101000 (Source address in incoming IP packet)
AND
255.255.255.240 11110000 (Perform the logical AND)
01100000 (Logical AND result)
Filter Rule: 200.1.1.96 (Source IP Network Address)
255.255.255.255 (Source IP Mask)
Forward = No (What happens on match)
IP Address Binary Representation
200.1.1.96 01100000 (Source address in incoming IP packet)
AND
255.255.255.255 11111111 (Perform the logical AND)
01100000 (Logical AND result)