CHAPTER 6: Applications
89
6.2 ISDN IP Router Running NAT
In this example, multiple PC end stations on a remote subnet need to connect to the local network using an
ISDN IP router. This example assumes Network Address Translation (NAT) is configured on the IP router.
Note that, in many ways, this configuration behaves like an IP Host environment (see
Section 6.1
). NAT is an
IP address-conversion feature managed by the remote router that allows one-to-many one or more end stations
to share a single IP address to the Internet, thus reducing connection costs and address-management hassles.
NAT effectively allows an entire subnet to connect to the Internet as a single remote user.
PSTN
Local Network
Remote Network
(local addresses from
DHCP server)
Internet
Intranet
Concentrator
Router 1
Router2_nat
2.2.2.6
Server
Running
CSM
2.2.2.5
2.2.2.3
2.2.2.1
2.2.2.2
2.2.2.4
From pool:
An address from
2.2.2.11 to 2.2.2.25
