Patton IPLink 2620/KK Bedienungsanleitung

Application Note: Configuring the IPLink™ Router for Dual Routed Application 1

Applies to the following product

•IPLink™ Model 2620/KK

Application Overview

This application note describes how to conﬁgure your IPLink router to use both WAN ports in a dual-routed

application. WAN port 1 connects to your upstream network, which may be the ISP, and is the default gateway

for your private network. This is “Subnet 1” in ﬁgure 1. WAN port 2 can be connected to either a remote ofﬁce

or to a DMZ which is on the same subnet (Subnet 2 in ﬁgure 1) as the Ethernet port. NAT can be enabled

between the two subnets. This lets you use private IP addresses ensuring the internal network structure is invis-

ible to users on the Internet. The issue of security with comprehensive NAT conﬁguration is outside the scope

of this application note, but will be addressed in another..

Figure 1. Dual-routed applicaiton with remote ofﬁce on same subnet of Ethernet port

IP Addressing.

The IP address and subnet mask of the Ethernet port is 10.10.9.9/24.

WAN port 1 connects to the upstream router on the 192.168.1.0/24 subnet. WAN port 1 may obtain its IP

address via DHCP from the ISP or it may be conﬁgured with a ﬁxed IP address if the appropriate arrangement

is made with the ISP.

Application Note

Conﬁguring the IPLink™ Router for

Dual Routed Application

Application Note: Configuring the IPLink™ Router for Dual Routed Application 2

WAN port 2 and the Ethernet port are on the 10.10.9.0/24 subnet, so trafﬁc is bridged betwween the two

interface ports. However IP trafﬁc is routed between Subnet 1 and Subnet 2.

NAT conﬁguration sets WAN port 1 as the “external” environment. WAN port 2 and the Ethernet port are

“internal” and the ﬁrewall would be conﬁgured to protect users in the main and remote ofﬁces.

PPP or Frame Relay.

Either PPP or Frame Relay communication links may be used. In this example, WAN port 1 is conﬁgured as a

routed PPP connection. WAN port 2 is bridged PPP because the users in the main ofﬁce (on the IPLink’s

Ethernet) and the users in the remote ofﬁce are on the same subnet, hence a bridged connection is the correct

selection.

Detailed Information

You will need the following information to correctly deﬁne the conﬁgurable parameters for this IPLink appli-

cation.

Upstream Router Details

The upstream router provides access to the Internet and has the following characteristics.

•Channelized E1 (G.703/G.704)

-HDB3 line coding

-120 Ohm twisted pair connection

-As master clock, the upstream router provides the clock to the 2620 WAN port 1.

-Time Slots: 1 - 31

•WAN Service

-Routed PPP

-Assumes that the 2620 is conﬁgured with a ﬁxed IP address assigned by the ISP

-Router IP address & subnet mask: 192.168.1.1/24

2620/KK WAN Port 1 conﬁguration parameters

These are the conﬁgurable parameters for WAN port 1 on the 2620/KK IPLink.

•Channelized E1 (G.703/G.704)

-HDB3 line coding

-120 Ohm twisted pair connection

-Clocking mode-derived from the E1 (Receive Clock)

-Time Slots: 1-31

•WAN Service

-Routed PPP

-Interface 1 (WAN Port 1)

-Local WAN IP address and subnet mask: 192.168.1.2/24

Application Note: Configuring the IPLink™ Router for Dual Routed Application 3

-Remote IP address and subnet mask (of the upstream router): 192.168.1.1/24

-No authentication

2620/KK Ethernet port parameters

The Ethernet port deﬁnes the IP subnet for WAN port 2.

•IP parameters

-IP address: 10.10.9.9

-Netmask: 255.255.255.0

-IP subnet: 10.10.9.0/24

-Gateway route: 192.168.1.2

2620/KK WAN Port 2 conﬁgurable parameters

The second WAN port is conﬁgured as follows:

•Channelized E1 (G.703/G.704)

-HDB3 line coding

-120 Ohm twisted line pair connection

-Clocking: Not a conﬁgurable parameter. WAN port 2 derives clock from WAN 1 to synchronize the

transmitted signal on WAN port 2.

-Time Slots: 1-31

•WAN Service parameters

-Bridged PPP

-Interface 2: WAN port 2

-No authentication

Initial Conﬁguration

Install and conﬁgure your IPLink WAN Access Router according to the directions in the

2603 & 2620 IPLink

Quick Start Guide,

shipped with your router (and available online at www.patton.com/manuals). When cor-

rectly installed:

•The Ethernet port will connect to the same Ethernet LAN as your PC

•You can access the web management pages for conﬁguration on the 2620/KK.

Access the IPLink Web Management Home Page

Access the IPlink Web Management Home page (see ﬁgure 2 on page 5) by using a web browser on your PC.

Enter the IPLink’s IP address and log in to the IPLink.

The IPLink home page is divided into two panes, a

conﬁguration menu pane

on the left, and a

conﬁguration

information pane

on the right. You will use the

conﬁguration menu pane

to navigate from page to page. You

will use the

conﬁguration information pane

to view and modify conﬁgurable parameters, and to view IPLink

system status information.

Application Note: Configuring the IPLink™ Router for Dual Routed Application 4

If unable to access the web management pages

Check these items if you are unable to access the 2620/KK’s management pages.

Verify that your PC and the 2620/KK are on the same subnet

Can you ping the 2620/KK from the PC? Can you ping the PC from the 2620/KK?

Check to see whether the Link/Act LED on the 2620/KK is lit. If not, the 2620/KK does not see an Ether-

net signal from your PC.

WAN Ports 1 and 2 - Clocking conﬁguration

The most critical issue to understand about the two WAN ports on the 2620/KK is the clocking mode. Notice

that WAN port 2 does not have any clocking mode parameters, because WAN port 2 uses the clocking of

WAN port 1 for its clocking source.

WAN port 1 on the other hand can derive its clocking source from either the 2620/KK’s internal clock or from

the received T1/E1 signal. In this example, we are assuming that WAN Port 1 is connecting to a service pro-

vider. Consequently we want to use its clock as the synchronizing source. In other words, conﬁgure Clocking

Mode to

receive

The second point to notice is that the two WAN ports can be conﬁgured independently for different line rates

(n x 64 kbps). In our example, we are conﬁguring both for the same line rate of 31 DS0 time slots because we

don’t want one of them to become a bottleneck.

Table contains the conﬁgurable parameters and their values for both WAN ports.

WAN Port 1 conﬁguration

Following the hyperlink path to access WAN port 1’s E1 conﬁguration web page. Menu --> WAN Port1 -->

Conﬁguration. Using the values from table 1 for WAN Port 1, conﬁgure the E1 port as in ﬁgure 2. Click the

Create button to enable all the new parameter values.

Table 1. Conﬁgurable parameters - WAN Ports 1 & 2

Parameter

WAN Port 1 value WAN Port 2 value

Time Slot Select 1-31 Payload Rate: 1984 kbps 1-3 Payload Rate: 1984 kbps

Line Options Channelized E1 (G.703/G.704) Channelized E1 (G.703/g.704)

Code Sel HDB3 HDB3

Line Build Out 120 Ohm 120 Ohm

Clocking Mode Receive Clock n/a

Idles Codes Enabled Enabled

Power Down Normal Normal

Application Note: Configuring the IPLink™ Router for Dual Routed Application 5

Figure 2. Conﬁguration of WAN Port 1

Click on the Status hyerlink in the 2620 Conﬁguration Menu to view any alarms. If it appears as ﬁgure 3, the

most proabable cause is no E1 connection to WAN Port 1.

Figure 3. Status of WAN Port 1 conﬁgured but not connected

Connect a valid E1 line to WAN Port 1 on the rear of the 2620/KK, and refresh the Status web page. If the

conﬁguration matches the E1 parameters from the service provider, the alarms will cease, as in ﬁgure 4.

Figure 4. Connected E1 ro WAN Port 1

WAN Port 2 conﬁguration

Following the hyperlink path to access WAN port 2’s E1 conﬁguration web page. Menu --> WAN Port2 -->

Conﬁguration. Using the values from table 1 for WAN Port 2, conﬁgure the E1 port as in ﬁgure 5. Click the

Create button to enable all the new parameter values.

Application Note: Configuring the IPLink™ Router for Dual Routed Application 6

Figure 5. Conﬁguration of WAN Port 2

You can view the Status web page for WAN Port 2 as you did earlier for WAN Port 1.

Now that the Physical Layer (1) has been conﬁgured, we will move to the Datalink Layer (2).

Conﬁgure the Routed PPP WAN Service for WAN Port 1

Consult the application diagram, ﬁgure 1, again. The next step is to establish a functional routed PPP link

between WAN Port 1 and the upstream route which is shown as the service provider. To look at the details of

the conﬁguration for a better understanding, see ﬁgure 6. Notice that this routed PPP WAN service is in a dif-

ferent subnet than either the Ethernet or other WAN port and is called subnet 1 in ﬁgure 1.The subnet on

WAN port 1 is 192.168.1.0/24. You need the IP address of the service provider’s upstream router to conﬁgure

for the WAN gateway IP address. In this example, the upstream router’s IP address is 192.168.1.1/24.

Figure 6. WAN Port 1 - Routed PPP details

Go to the conﬁguration web page for creating a routed PPP connection by following this hyperlink path on the

2620/KK IPLink’s web pages.

2620 Conﬁguration Menu -> Services Conﬁguration -> WAN ->

Create a new service...

-> PPP routed and

click on the Continue button. You should see a conﬁguration page as in ﬁgure 7. Enter the values in the vari-

ous ﬁelds and click on the Create button.

Description: wan1-ppp-rtd (you can choose your own description)

Interface: 1

WAN IP address: 0.0.0.0 255.255.255.255

Physical Port: wan1 (

Application Note: Configuring the IPLink™ Router for Dual Routed Application 7

LLC header mode: off

HDLC header mode: on

No authentication (and leave the User name and Password ﬁelds blank).

It should look identical to the web page in ﬁgure 7.

Figure 7. WAN Port 1 PPP Routed conﬁguration

From the “WAN connections” web page, click on the

Edit...

for this WAN service. You now see the “Edit Net-

work Connection” webpage with numerous hyperlinks. Click on

Edit ‘Ip Interface’”,

enter these values and click

on the Create button.

Ipaddr: 192.168.1.2

Mask: 255.255.255.255

Dhcp: false (disabled)

MTU: 1500

Name: ppp-0 (already assigned to the WAN service upon creation)

Enabled: true

The web page should appear as ﬁgure 8.

Application Note: Configuring the IPLink™ Router for Dual Routed Application 8

Figure 8. Assigning the IP address to WAN Port 1 on PPP Routed link

The last conﬁguration item for the routed PPP routed link is the WAN IP address, which is the remote IP

address of the upstream router. Click on

“Edit ‘PPP’”,

then click on

“View advanced attributes...”

and enter the

IP addresses in the “Remote Ip:” and “Local Ip:” ﬁelds as in ﬁgure 9. Click on the Create button.

Figure 9. Conﬁguring IP addresses for local and remote ends of routed PPP link

Assuming that you have connected the WAN Port 1 to the E1 line, the routed PPP session should come up.

When it is “UP” and also ready for data transfer, the web page appears as in ﬁgure 10. To reach it, click on the

“Edit ’PPP’”

link, scroll down to see the

Summary

and

Connect state

ﬁelds. Notice that the Summary indi-

cates “Open for IP”. Not only is the PPP link ofﬁcially “UP,” but it has also negotiated the Network Control

Protocol (NCP) which is necessary for data transfer. The Connect State is “connected.”

Figure 10. Routed PPP link up and transferring data

Application Note: Configuring the IPLink™ Router for Dual Routed Application 9

All that remains is to create a route for the routing table, and the routed PPP WAN service should be fully

operational--at least from this end of the link.

Conﬁguring the Routing Table

Under the “Services Conﬁguration” menu item, click on “IP routes.” In the main window, click on the

“Create

new Ip V4Route...”

for adding routes in general. At this point in the conﬁguration, we are setting the default

route. As in typical default routes, the destination is 0.0.0.0 with a netmask of 0.0.0.0, since it is the last resort

route--if no other routes deﬁne the port for routing an IP packet, send it to the port indicated by the default

route. In our example, the default routed port is the IP address of WAN port 1, 192.168.2. The interface is

ppp-0. See ﬁgure 11 for the correct conﬁguration of the default route.

Figure 11. Adding Gateway address to routing table

Click on the

IP routes

hyperlink in the Conﬁguration Menu. If the route is properly entered, a green check

mark is under the

Valid

column. See ﬁgure 12 as an example.

Figure 12. Indication of a valid route

Conﬁgure WAN Port 2 for Bridged PPP WAN Service

Conﬁguring the bridged PPP WAN service for the second T1/E1 port is much simpler than the preceding

routed PPP conﬁguration. Click on

Create a new service...

link on the WAN Connections page to select “PPP

Bridged.” ﬁgure 13 shows the values for each conﬁgurable parameter. Creating a Description is necessary for

the IPLink to build a WAN service. The most critical parameters are the Interface and Physical Port ﬁelds,

which are “2” and “wan2”, respectively. Click the Create button after entering all the values as in ﬁgure 13.

Application Note: Configuring the IPLink™ Router for Dual Routed Application 10

Figure 13. WAN Port 2 - Conﬁguring the bridged PPP link

After completing this conﬁguration, click on the

“Edit ’PPP’”

link to see if the link status. A proper conﬁgura-

tion and E1 link to WAN Port 2 should yield a valid bridged PPP link. In ﬁgure 14 the Summary states “open

for MAC” followed by the number of sent and received octets. Due to being a bridged PPP link, the link is not

“open for IP”, but “open for MAC”, the unit of encapsulation for bridges. The link has fully connected.

Figure 14. Bridged PPP link up and running

Test the connection

The ﬁrst tests of the PPP connections are for successful pings to the IP address of WAN Port 1’s IP address.

Since the bridged PPP connection does not have a uniquely assigned IP address, the test is to ping the IP

address on the remote end of the bridged PPP connection.

If the ping fails, the ﬁrst check is with the physical layer. If the physical layer is not operating correctly,

there is no hope of layer two protocols (PPP) to function.

– Verify that the E1 links are operating properly with no alarms or errors. If there are alarms or errors, they

must be resolved before any success can be expected for the PPP links.

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