Chapter 12 Packet Filter

Offset (from 0) and the Length fields, both in bytes. The ZyXEL Device applies the Mask (bit-wise ANDing) to the data portion before comparing the result against the Value to determine a match. The Mask and Value are specified in hexadecimal numbers. Note that it takes two hexadecimal digits to represent a byte, so if the length is 4 bytes, the value in either field will take 8 digits, for example, FFFFFFFF.

In the Packet Filter screen, select Then click the Edit button from the

Generic Filter from the Filter Type field. Modify field to display the following screen.

Figure 93 Security > Packet Filter > Edit (Generic Filter)

The following table describes the labels in this screen.

Table 64 Security > Packet Filter > Edit (Generic Filter)

LABEL

DESCRIPTION

#

This is the index number of the rules in a filter set.

 

 

Active

Use the check box to turn on or off a filter rule.

 

 

Filter Type

This field displays whether the filter type is a protocol filter or

 

generic filter.

 

 

Offset

This field displays the offset value.

 

 

Length

This field displays the length value.

 

 

Mask

This field displays the mask value.

 

 

Value

This field displays the value.

 

 

Modify

Click the Edit icon to configure a filter rule.

 

Click the Remove icon to delete a filter rule.

 

 

Back

Click this to return to the previous screen without saving.

 

 

Apply

Click this to save your changes.

 

 

Cancel

Click this to restore your previously saved settings.

 

 

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P-660HW-Tx v3 Series User’s Guide