Nortel 820 Betriebsanweisung

Introduction

206901-A

1-9

   

 illustrates how two BayStack 820 ISDN Routers installed in two 

different locations support a private company network and highlights an important 
feature of the router. Both public and private devices can physically reside on the 
same LAN. Both of the routers are connected to the Internet and are also 
connected to each other through the ISDN network, forming a private company 
network.

In this illustration, all devices on both LANs (except for the Web server) are 
configured to obtain their IP addresses automatically from the built-in DHCP 
server in the BayStack 820 ISDN Router. Because these IP addresses are used 
only in the local LAN environment, these devices naturally form a private 
network with default network IP addresses of 192.168.168.xxx, and cannot be 
accessed from the Internet. For a server to be accessible from the Internet, it must 
be mapped to a TCP/UDP port in the BayStack 820 ISDN Router Manager 
software using Network Address Translation.

To enable LAN-to-LAN communications, you need to change the default private 
network address (192.168.168.0) for one of the routers (for example, to 
192.168.170.0 as illustrated in 

). The traffic between these two 

networks is secure because data is sent across the ISDN network through a direct 
phone call.

BayStack 820

ISDN Router

ISDN

ISDN

The

internet

Private:
192.168.170.xxx

Private:
192.168.170.230

Private:
192.168.168.xxx

Private:
192.168.168.230
Public: 
206.112.113.6

Web server
Public:
206.112.113.xxx

BayStack 820

ISDN Router

9437FA