User`s guide

IP Routing

6-7

8000-A2-GB21-10

June 1997

The following illustration shows the packet flow when ES1 sends to ES3, ES1

and ES3 are in different customer domains, and source-based routes are defined

for ES1 and ES2 (indicated by the S/D flag).

97-1556

Router

155.1.3.1

159.1.3.1

DSL Card

s1c

RTU 1

135.1.3.3

155.1.3.5

ES2

s1d

RTU 2

135.1.3.4

159.1.3.4

ES3

Packet

Flow

e1a

159.1.2.1

ISP2

159.1.2.2

Host/Net/Subnet

1) 155.1.3.4

2) 155.1.3.5

3) 159.1.3.4

Subnet Mask

255.255.255.255

Next-Hop Address

155.1.3.1

159.1.3.1

S/D (Source/Destination)

src (source)

Partial DSL Routing Table

ISP1

155.1.2.2

155.1.2.1

155.1.3.4

ES1

Internet