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Security 10-43
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
Incoming packet has the source address of 200.1.1.104.
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
Incoming packet has the source address of 200.1.1.96.
255.255.255.240 11110000 (Perform the logical AND)
10110000 (Logical AND result)
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