ZyXEL zyxel Prestige100 User Manual download pdf (Page 98)

86 Filter Configuration

Figure 8-5 Menu 21.1.1 - Generic Filter Rule

Offset -

Offset refers to the value of the byte that you want to

use as your starting offset. That is, in the data packet, at what

point do you want to begin the comparison. The range for this

field is from 0 to 255.

Default = 0

Length -

This field refers to the length (in bytes) of the data in

the packet that the Prestige should use for comparison and

masking. The starting point of this data is determined by

Offset

The range for this field is 0 to 8.

Default = 0

Mask -

In this field, specify (in Hexadecimal) the value that the

Prestige should logically qualify [and] the data in the packet.

Since

Length

is given in bytes, you need to enter in twice the

length hexadecimal numbers for this field. For example, if

Length

were ‘4’, then a valid

Mask

must have 8 hexadecimal

numbers, like ‘1155ABF8’.

Value -

In this field, specify (in Hexadecimal) the value that

the Prestige should use to compare with the masked packet.

The value should align with

Offset

. Since

Length

is given in

bytes, you need to enter in twice the length hexadecimal

numbers for this field. For example, if

Length

were ‘4’, then a

valid

Value

must have 8 hexadecimal numbers, like

1 2 ... 93 94 95 96 97 98 99 100 101 102 103 ... 129 130

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ZyXEL zyxel Prestige100 User Manual Page 98