18
A R 7 2 0 R O U T E R Q U I C K S T A R T G U I D E
and use a terminal emulation program like Windows™
Terminal.
3
Login to the MANAGER account on each router, as
described in the
AR700 Series Router Quick Install Guide
.
4
Collect together the information that you will need to
configure IP. We recommend you photocopy the table on the
previous page and fill in the details.
CONFIGURING IP
The following steps are required:
1. Configure the PPP Link.
2. Configure the IP routing module on both routers.
3. Test the configuration.
Configure the PPP Link
Configure PPP interface 0 on each router to use the wide area
link. See
Getting Connected
for information about configuring
PPP to use a synchronous link. See
Configuring ISDN
for
information about configuring PPP to use an ISDN call. If the
PPP interface is configured for dial on demand operation (see
Configuring ISDN Dial on Demand
) or bandwidth on demand
operation (see
Configuring ISDN Bandwidth on Demand
), these
services will automatically be used by the IP routing software.
Configure IP Routing
1
Clear any pre-existing IP configuration and turn on the IP
routing software on each router, using the commands:
PURGE IP
ENABLE IP
2
On the Head Office router define two IP interfaces, one for
the Ethernet LAN and one for the wide area link:
ADD IP INT=ETH0 IP=172.16.8.33
MASK=255.255.255.0
ADD IP INT=PPP0 IP=172.16.254.1
MASK=255.255.255.0
3
Repeat this procedure on the Remote Office router,
defining one IP interface for the Ethernet LAN and one for the
wide area link:
ADD IP INT=ETH0 IP=192.168.31.30
MASK=255.255.255.240
ADD IP INT=PPP0 IP=172.16.254.2
MASK=255.255.255.0
4
A routing protocol, such as RIP, can be enabled so that the
routers can exchange information about routes to all of the IP
devices (hosts, PCs, file servers, etc.) on the internet. However,
on a dial-on-demand ISDN connection this may result in
excessive call charges. So for this example static routes will be
defined. On the Head Office router enter the command:
ADD IP ROUTE=192.168.31.0
MASK=255.255.255.240 INT=PPP0
NEXT=172.16.254.2
5
Repeat this procedure for the Remote Office router,
entering the command:
ADD IP ROUTE=172.16.8.0
MASK=255.255.255.0 INT=PPP0
NEXT=172.16.254.1
6
The IP routing software is now configured and operational
on both routers.
Test the Configuration
The IP configuration can now be checked using the following
commands and then functionally tested by establishing a Telnet
(remote access) connection to the remote router.
1
To check the routes, type (on either router):
SHOW IP ROUTE
This should produce a display (on the Head Office router) like
that shown on page 19. For each router, there should be a
route to the LAN and PPP interfaces on the local router and a
route to the LAN interface on the remote router.
2
Test the PPP link between the two routers using the PING
command on each router to send ping packets to the router at
the remote end of the PPP link. On the Head Office router use
the command:
PING 192.168.31.30
On the Remote Office router use the command:
PING 172.16.8.33
Within a few seconds the router will display a message like:
Echo reply 1 from 172.16.8.33 time delay
20 ms
indicating a response was received from the router at the
remote end of the PPP link.
Note
:
We have used the Ethernet address in this example but you
can ping any of the remote router’s assigned IP addresses.
3
To functionally test the connection between the two
routers, use Telnet to establish a connection to the remote
router. Enter the following command on the Head Office
router to connect to the Remote Office router:
TELNET 192.168.31.30
