Data Comm for Business, Inc.
2949 County Road 1000 E
Dewey, IL 61840
217-897-6600, FAX 217-897-1331
Outside Illinois: 800-4DCBNET
http://www.dcbnet.com
IP-6600 Router Configuration Quickstart
Backing Up a Broadband Connection with Dialup
Introduction
Broadband network service is becoming a desirable alternative to dialup or leased–line service
for access to remote networks. However, high availability applications such as SCADA, may
need a backup in the case the broadband connection fails. This paper describes how to configure
the IP-6600 family of routers to automatically detect a routing failure across a broadband
connection and to switch routing to a dialup connection.
How Does it Work
The two IP-6600 routers are configured to ping each other through the broadband interface. If
the peer router fails to respond for some period of time, each router will adjust their routing tables
to send packets through the backup interface. While in backup mode, the routers will continue to
attempt contact through the broadband interface. Once service is restored, the routers will
automatically revert back to using the broadband interface.
Prerequisites
In most cases you will be purchasing broadband service from a third-party provider. It is not
required to directly connect the IP-6600 routers through the broadband interface as the above
picture may imply. There may be intermediate routers, either yours or your network providers,
between the IP-6600s. The requirement is that your
local
and
remote
networks must be
IP-6600
Router
IP-6600
Router
Modem
Modem
Local
Network
Remote
Network
Backup
POTS or Cellular Serv ice
Broadband
Interf ace
Broadband
Interf ace
Primary
Intranet /
Internet
Router
Ethernet-B
Ethernet-B
Serial-B
Serial-B
Ethernet-A
Ethernet-A
10.0.1
255.255.255.0
10.0.1.1
10.0.1.2
10.0.2
255.255.255.0
10.0.2.2
192.168.0.1
192.168.0.2
10.230.0.13
10.225.0.7
Broadband
Serv ice
10.230.0.1
10.225.0.1
