D-Link DI-206 User Manual - Ip Filter

DI-206 ISDN Remote Router

74

Configuration and

Management

•

  Offset – This defines the reference byte for the Length parameter

(described below). The Offset is the number of bytes (octets) from

the beginning of the first byte of the frame header, immediately after

the preamble. The range of the offset parameter is from 0 to 255

octets. The first byte in a packet has an offset 0.

•

  Length – This is the number of bytes (octets) from 0 to 8 to

compare from the offset value (the Offset reference byte).

•

  Value – This is a 16 digit, hexadecimal field, defining the actual bit

values used to compare with the frame data, at the specified (Offset)

position.

•

  Mask – This is a 16 digit, hexadecimal bit mask, used as an

operand in the bit-wise AND operation that will be applied to the

Value parameter.

IP Filter

The IP Filter is specifically an IP protocols filter, allowing you to,

among other things, firewall your network, prohibiting specific packets

from entering or going out from your network. It is necessary to have

good knowledge of IP protocol before effectively configuring this filter.