Справочник Пользователя для Netopia 4753 2a4na

Security 13-25

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 4753. This rule will for ward 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 4753 is 01100000, and the source IP address after the
logical AND is 1011000, this rule does not match and this packet will be for warded.

Filter Rule:

200.1.1.0

(Source IP Network Address)

255.255.255.128

(Source IP Mask)

For ward = No

(What happens on match)

IP Address

Binar y Representation

200.1.1.184

10111000

(Source address in incoming IP packet)

AND

255.255.255.128

10000000

(Per form the logical AND)