Справочник Пользователя для Netopia D7171 SDSL

If you chose Generic filtering in step 

 on 

, the Add Filter screen changes as shown:

Note: Generic filters are more complicated to use than IP filters. If you plan to filter only IP traffic, we 
recommend that you use IP filters instead.

Generic filters are per formed on packets as a whole, after layer 2 encapsulation is removed (ATM-FUNI or Frame 
Relay). You configure them in much the same way as the IP version.

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The Value and Mask fields can be 8 bytes in length, two characters per byte, so for example a MAC 
address is 6 bytes: 00-00-C5-60-34-74. 

The Value, Mask, and Offset are used together to determine if the packet matches the filter. The Value is 
logically ANDed with the Mask; the Offset specifies the number of bytes into the packet where the Value 
ANDed with the Mask must be present. If these match, the filter matches the packet.

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Several Generic Filters can be ANDed together by toggling Chain to Next Filter to Yes. In this case all the 
filters chained must match the packet, and the last filter in the chain determines the For warding decision. 
The Compare field works as it does in the Filter version 

                                 Add Filter

         Enabled:                           Yes
         Forward:                           No
         Type...                            Generic

         Value:                             000000000000
         Mask:                              000000000000
         Offset:                            0

         Compare:                           Equal

         Chain to Next Filter:              No

         ADD THIS FILTER NOW                CANCEL

Enter the IP specific information for this filter.