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IP Filtering
Service Security
7-4
For instructions on how to set filters to prevent unwanted traffic from leaking into
the management domain, see Chapter 5 of the HotWire DSLAM for 8540 and
8546 DSL Cards User's Guide .
Filtering on the upstream DSL ports can be used to ensure that only end-user
systems with valid IP addresses are able to route traffic to the service domain.
That is, filtering would block traffic from being routed upstream by another
end-user system that spoofs (attempts to gain access to another system by
posing as an authorized user) an IP address of an end-user system connected to
a different HotWire RTU.
The following illustration is an example of this type of filtering:
155.1.3.4
DSL Card
X
155.1.3.4
For information on how to set filters on the upstream DSL ports, see Chapters 5
and 6 of the HotWire DSLAM for 8540 and 8546 DSL Cards User's Guide .
November 1997
End-user
System 1
RTU
End-user
System 2
RTU
97-15491
8000-A2-GB21-20
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