1. Bridged Mode (Non-routed) WanLink

Goal: Allow LANforge-ICE to sit transparently on a network segment by using a Bridged Mode WanLink to simulate a WAN. Return to LANforge-ICE Cookbook

In this test scenario, a LANforge-ICE WanLink is created in Bridged Mode to simulate a WAN consisting of a DS1 speed (1.544Mbps) link with 20ms of delay in one direction and 30ms of delay in the other direction.

1. Setup the LANforge Ports so that they have 0.0.0.0 IP addresses.

   Bridged Mode WanLinks use ports that have no IP address because the ports are transparent to the traffic flowing through them.

   A: Go to the Port Manager
   B: Modify port eth0 • Set the IP address, IP Mask and Gateway IP to all zeroes (0.0.0.0)
   C: Modify port eth1 • Set the IP address, IP Mask and Gateway IP to all zeroes (0.0.0.0)
   D: Verify the port configuration

   • For more information, see the LANforge-GUI User Guide: Ports (Interfaces)
   • Return to LANforge-ICE Cookbook
2. Create a WanLink.

   A: Go to the WanLinks tab
   B: Create a WanLink • To simulate a WAN, enter a specific amount of delay or other impairment • For this example, enter 20ms of delay for Entry Point A and 30ms of delay for Entry Point B • Be sure to set the correct ports and transfer rate for each Entry Point • Click OK when done
   C: Verify the WanLink was created
   D: Go to the Status tab and click Netsmith to view the graphical representation of the WanLink
   E: This is the general form of a Bridged Mode WanLink in Netsmith. It consists of two 0.0.0.0 IP addressed ports with a vertical bar between them.

   • For more information, see the LANforge-GUI User Guide: WanLinks (ICE)
   • Return to LANforge-ICE Cookbook
3. Run traffic and verify results. Refer to the LANforge FIRE Cookbook to run traffic.

   A: Right-click on the WanLink and select Toggle WanLink to allow traffic to flow from a transmitting device to a receiving device
   B: The transmitting/receiving devices can be just about anything that generates and receives traffic such as a web server and client or a pair of LANforge-FIRE ports • Right-click the WanLink and select Display WanLink
   C: View the WanLink display
   D: View the WanLinks tab • Selecting a WanLink automatically selects the WanLink Endpoints on the bottom panel • Scroll to the right on the bottom panel to note the Serialization Delay (delay injected by LANforge to account for packet size and transfer rate). In this case, SD = (1514 bytes * 8 bits/byte) / 1.544Mbps = 7.8ms • The total delay as experienced by the transmitting/receiving device is the sum of the WanLink configured delay and the serialization delay which in this case would be about 28ms in one direction and 38ms in the other.

   • For more information, see the LANforge FAQ: Serialization Delay
   • Return to LANforge-ICE Cookbook

  Email Candela Technologies at: support@candelatech.com if you have any questions or suggestions.