User`s guide

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IP Filtering

7-4

8000-A2-GB21-10

June 1997

The following illustration is an example of this type of filtering:

97-1549

End-user

System 1

RTU

DSL Card

End-user

System 2

RTU

155.1.3.4

For information on how to set filters on the upstream DSL ports, see Chapters 5

and 6 of the

HotWire Digital Subscriber Line Access Multiplexer (DSLAM) User’s

Guide

Service Security Filtering Scenario

The following is an example of filtering to ensure service security:

97-15476-0

Router

155.1.2.1

155.1.3.1

ISP1

155.1.2.2

DSL Card

155.1.3.2

RTU 1

135.1.3.3

155.1.3.4

ES1

1) 155.1.3.4

2) 155.1.3.4

3) 155.1.3.6

4) 155.1.3.6

155.1.3.1

135.1.3.3

155.1.3.1

135.1.3.5

s1c

s1d

RTU 2

135.1.3.5

155.1.3.6

ES2

Host/Net/Subnet Subnet Mask

255.255.255.255

Next-Hop Address S/D (Source/Destination)

src (source)

dst (destination)

src (source)

dst (destination)

DSL Routing Table

The RTU forwards upstream any traffic on its LAN interface for which it does not

know the host.