Security 13-35

Filter basics

In the source or destination IP address fields, the IP address that is entered must be the network address of the subnet. A host address can be entered, but the applied subnet mask must be 32 bits (255.255.255.255).

The Netopia R5000 Series Router has the ability to compare source and destination TCP or UDP ports. These options are as follows:

Item

What it means

 

 

No Compare

Does not compare TCP or UDP port

 

 

Not Equal To

Matches any port other than what is defined

 

 

Less Than

Anything less than the port defined

 

 

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

 

 

Example network

Incoming

Packet Filter

Netopia

Internet

IP: 200.1.1.??

DATA

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Netopia R5000 manual Filter basics, Example network