user manual

Security 10-43

This incoming IP packet has a source IP address that matches the network address in the Source IP Address

ﬁeld (00000000) in the Motorola Netopia® Embedded Software Version 8.7.4. This will

not

forward this packet.

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 Motorola Netopia® Embedded Software Version 8.7.4. 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.

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)