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Dual WAN Function
Vigor 2910 series have two Ethernet WAN Interfaces. The Dual WAN Ports allow you to connect to two separate broadband connections for automatic fail over and load balancing. WAN1 is through WAN port (W1) and WAN2 is through LAN1 port (P1/W2). You may refer to the figure shown below. If you do not have a second WAN feed, you can use the 2nd WAN port as a regular LAN port instead.
Automatic Failover Function
For your business you need a reliable connection. The downtime of even just a few minutes is equal to quite a bit of revenue loss. You may use Automatic Failover for network redundancy to keep your Internet connection always online. Assuming you have you 2 links, one is Cable connection with 10Mbps (link a) and the other is ADSL connection with 512Kbps (link b). Normally you want all the traffic goes through link a. The speed of link b is much lower so you don’t want to use it unless link b is down.
Refer to the steps below to setup your Vigor router.
1. Connect the Cable line to W1 port and the DSL modem to P1/W2 port respectively.
2. Open the Web configurator and go to WAN >> General Setup
3. Enable WAN1 and WAN2.
Setup the Active Mode.
Select "Always On" for WAN1.
Select "Active on demand" for WAN2 and tick "WAN1 Fail".
You may refer to the figure shown below.
4. Go to WAN >> Internet Access
5. Select "Static or Dynamic IP" for WAN1 and "PPPoE" for WAN2 respectively. Then press the "Details Page" button to display the corresponding configuration page.
6. Setup the proper Cable line and DSL line info in those pages.
After the configuration, Vigor will use ARP to check the liveness of WAN1’s Gateway. If there is no response for a duration it will drop the connection of line a, then automatically dial the DSL connection for WAN2. After line b is connected, all the traffic will be guided and switched to WAN2. Though WAN1 is down, Vigor router is always send ARP to check the liveness of its gateway. When it receives the ARP response sent from the Gateway and re-establish the connection, Vigor will use line a again and disconnect line b.
Load Balance Function
With multiple WAN connections, you will get the effective combined Dual-WAN speeds for all your LAN users.
Assuming you have you 2 links, one is Cable connection with 10Mbps (link a) and the other is ADSL2+ connection with 20Mbps (link b).
Refer to the steps below to setup your Vigor router.
1. Connect the Cable line to W1 port and the DSL modem to P1/W2 port respectively.
2. Open the Web configurator and go to WAN >> General Setup
3. Enable WAN1 and WAN2.
4. Setup the Active Mode. Select "Always On" for WAN1 and WAN2.
5. Setup Load Balance Mode.
If you know the real speed of both lines, please select "According to Line Speed" then enter the speed value in the "Line Speed (bps)" field. See figure shown below.
If you have no idea about the line speed, please just select "Auto Weight". Vigor router will automatically detect the maximum available bandwidth. See figure shown below.
Note: By monitoring real time speed of both WAN connections, the Twin WAN Gateway will establish new sessions based on the ratio of the amount of the remaining available bandwidth.
6. Go to WAN >> Internet Access
7. Select "Static or Dynamic IP" for WAN1 and "PPPoE" for WAN2 respectively. Then press the "Details Page" button to display the corresponding configuration page.
8. Setup the proper Cable line and DSL line info in those pages.
Load Balance Mechanism
To which WAN port the traffic is routed is according to the Load Balancing mechanism. Below diagram shows that how Vigor router decide the WAN interface for each packet.
Load Balance Policy
Load Balance Policy is a method of binding specific traffic (such as https traffic) to a particular WAN for the duration of a session. Some applications (HTTPS, FTP, VoIP, Terminal Services, Mail, etc) are sensitive to public IP address. They will monitor if your IP changes and log you out if your IP is changed. For example you may meet the problem that logging into certain HTTPS sites (e.g. online banking) keep booting you out.
We will take an example to explain how to setup the Load Balance Policy for the application that requires traffic to be sent and received from the same IP source. Assuming you want all the HTTPS traffic to be sent from WAN1.
1. Go to WAN >> Load Balance Policy.
2. Click the Index number 1.
3. Enable this policy. Select TCP 443. Select WAN1. Source IP address and destination IP address are leave blank which mean any IP address. Then press OK.
For more information please refer to the Load Balance Policy application note.
Dial On Demand Feature
In this mode, WAN1 is always ON, and WAN2 will be UP only when the speed of WAN1 exceeds specific value.
Assuming you have you 2 links, one is Cable connection with 10Mbps downstream and 1Mbps upstream (link a), the other is ADSL connection with 512kbps downstream and 512kbps upstream (link b). WAN2 will be active when the download speed of WAN1 exceeds 8Mbps OR the upload speed of WAN1 exceeds 400kbps.
Refer to the steps below to setup your Vigor router.
1. Connect the Cable line to W1 port and the DSL modem to P1/W2 port respectively.
2. Open the Web configurator and go to WAN >> General Setup
3. Enable WAN1 and WAN2.
4. Setup the Active Mode. Select "Always On" for WAN1 and "Active on demand" for WAN2.
5. Enter 400kbps and 8000kbps as the threshold value.
6. Go to WAN >> Internet Access
7. Select "Static or Dynamic IP" for WAN1 and "PPPoE" for WAN2 respectively. Then press the "Details Page" button to display the corresponding configuration page.
8. Setup the proper Cable line and DSL line info in those pages.
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Page last modified : 13 October 2008 |