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1: I
NTRODUCTION
DUA1860-0AAA01
Bridge Filters
The LinkBuilder MSH 4 Port Ethernet Bridge Module allows the
use of
customised filtering
, which can be used in addition to basic
transparent filtering, as explained in
Learning, Filtering And
Forwarding
on page 1-12. It supports the following custom
filtering modes:
■
Host-to-Host filtering
■
Host-to-Port filtering
■
Port-to-Port filtering
■
Multicast-to-Port filtering
■
Protocol filtering
■
Bit filtering
This section describes these filtering modes and filtering concepts
in general.
What Is Custom Filtering?
Custom filtering
lets you selectively define the hosts that can
communicate through the bridge. When applied, the bridge
filters
(discards) certain packets based on the contents of
filter
sets
. These filter sets can be edited by the bridge operator and are
used for indicating what devices' packets are to be filtered.
Figure 1-19
, Figure 1-20 and Figure 1-21 illustrate how a bridge
performs custom filtering. This particular example shows
host-to-port filtering.