
Implementation Notes
3-11
IP Adjacent Hosts
If you configure IP numbered interfaces over a dial circuit, you must configure
adjacent hosts to ensure that data follows the correct path.
An IP adjacent host is the next hop (that is, IP address) along the transmission
path that the data must follow. For example, in Figure 3-5, the Los Angeles router
is an adjacent host to the New York router.
Figure 3-5. Conceptual Drawing of Adjacent Hosts
To reach the Los Angeles router, you must configure the New York router’s local
IP address. This address is 192.32.14.1. You must also configure the New York
router’s adjacent host entry, which is 192.32.14.2, the address of the Los Angeles
router. These two entries designate the correct path from New York to
Los Angeles.
Although you must configure IP adjacent hosts, do not configure IPX adjacent
hosts. Adjacent hosts are unnecessary for IPX to work over PPP circuits.
Circuit 1 – 192.32.14.1
(the local interface to get to Los Angeles)
Dial
Device
Chicago
Circuit 2 – 192.32.15.2
Dial
Device
Dial
Device
New York
Demand Pool 1:
Dial
Device
Dial
Device
Dallas
Los Angeles
192.32.14.0
Circuit 1 – 192.32.14.2
Circuit 3 – 192.32.16.2
192.32.16.0
192.32.15.0
Line 1
Line 2
Configuration of the New York Router
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