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12-28 User’s Reference Guide
Example 2
Incoming packet has the source address of 200.1.1.184
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 R310. This rule WILL forward 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 R310 is 01100000, and the source IP address after the
logical AND is 1011000, this rule does NOT match and this packet will be passed.
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
200.1.1.184 10111000 (Source address in incoming IP packet)
AND
255.255.255.128 10000000 (Perform the logical AND)
10000000 (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
200.1.1.184 10111000 (Source address in incoming IP packet)
AND
255.255.255.240 11110000 (Perform the logical AND)
10110000 (Logical AND result)