Patton IPLink 2620/KK User Manual
Application Note
Configuring the IPLink™ Router for
Dual Routed Application
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 invisible 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 1
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 application.
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 2
- 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 3
1.
2.
3.
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 Ethernet 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 provider. 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.
Table 1. Configurable parameters - WAN Ports 1 & 2
Parameter
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
WAN Port 1 value
WAN Port 2 value
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.
Application Note: Configuring the IPLink™ Router for Dual Routed Application 4
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