User`s guide

IP Routing

6-6

8000-A2-GB21-10

June 1997

97-15473-0

Router

155.1.3.1

DSL Card

s1c

RTU 1

135.1.3.3

155.1.3.4

ES1

s1d

RTU 2

135.1.3.4

155.1.3.5

ES2

Packet Flow

e1a

155.1.2.1

ISP

155.1.2.2

Host/Net/Subnet

1) 155.1.3.4

2) 155.1.3.5

Subnet Mask

255.255.255.255

Next-Hop Address

155.1.3.1

S/D (Source/Destination)

src (source)

Partial DSL Routing Table

Upstream packets from ES1 (and ES2) are sent to 155.1.3.1, where in turn the

router would forward them to the ISP. Downstream packets from the ISP are sent

to ES2.

For upstream packets only (i.e., packets arriving over the DSL ports), the order of

routing precedence is:

 Source host route

 Source subnet route

 Source network route

 Destination host route

 Destination subnet route

 Destination network route

 Default route

NOTE:

When using source routing, do not use the default route.