Security 14-33
Example Network
Example Filters
Example 1
Incoming packet has the source address of 200.1.1.28
This incoming IP packet has a source IP address that matches the network address in the Source IP Address
field (00000000) in the Netopia R2020. This will NOT forward this packet.
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
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