ZyXEL P-660HW-T1 v3 User Guide - Page 224
Table 64
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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 Generic Filter from the Filter Type field. Then click the Edit button from the 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. Back Apply Cancel Click the Remove icon to delete a filter rule. Click this to return to the previous screen without saving. Click this to save your changes. Click this to restore your previously saved settings. 224 P-660HW-Tx v3 Series User's Guide