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Security 13-147
Example network
Example filters
Example 1
Incoming packet has the source address of 200.1.1.28
Less Than or Equal Any port less than or equal to the port defined
Equal Matches only the port defined
Greater Than or Equal Matches the port or any port greater
Greater Than Matches anything greater than the port defined
Filter Rule: 200.1.1.0 (Source IP Network Address)
255.255.255.128 (Source IP Mask)
Forward = No (What happens on match)
IP Address Binary Representation
200.1.1.28 00011100 (Source address in incoming IP packet)
AND
255.255.255.128 10000000 (Perform the logical AND)
00000000 (Logical AND result)
Netopia
Internet
IP: 200.1.1.??
DATA
Incoming
Packet Filter