Netopia R910 Manual de usuario descargar pdf (Pagina 147)

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

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Netopia R910 Manual de usuario Pagina 147