D-Link DI-206 User Manual
Page 86
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.