Filter
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1-24 C
HAPTER
1: I
NTRODUCTION
DUA1860-0AAA01
Figure 1-22 illustrates a host-to-host filter example, and shows
four network segments connected by a bridge. A filter set has
been set up allowing communication between devices A and D
only, through the bridge. Every packet received by the bridge has
its source address and destination address checked. If both
addresses match the addresses in the filter sets, the packet is
forwarded.
Figure 1-22 Host-to-Host Filtering Example
Host-to-Port Filtering
Host-to-port
filters allow the user to define groups of devices that
are allowed to communicate through the bridge with devices
connected to a specific bridge port. There is a host-to-port filter
set for each bridge port.
Host-to-port filter sets can be defined as
inclusion
or
exclusion
.
Inclusion means that devices in the set can communicate out of
that port, and all other devices cannot. If the set is empty, no
devices can communicate out of that port.