Tuesday, November 4, 2014

ASUS RT-AC68U - Dual WAN Set Up

It has been three months since I started using ASUS RT-AC68U as my home router. I have set up DUAL WAN, Port forwarding, DDNS , AiDisc and AiCloud features. In this post I am going to walk you through dual WAN router settings. I am not going to cover the basic WAN settings as there are lot of posts which tells you hot to do it and also the Quick Settings wizard helps to easily set the router up and running for you. In this blog post, I am going to cover DUAL WAN which I like the most.

before setting up the DUAL WAN , make sure you have the latest firmware. the latest firmware as on Sep 04, 2014 is For some reason, the option provided in the Firmware page under "Administration" menu did not detect the latest firmware. you can manually download and install the latest firmware always from the ASUS support page RT-AC68U . It is always better to update the firmware as soon as the new version arrives.

             ASUS RT-AC68U supports dual wan. i.e you can connect two different ISP connection to the same router. In this case, the dedicated WAN port acts as one WAN port and you can configure any one of the four LAN ports or the USB port (which is used to connect 3G USB Modem) to be second WAN port. You have to set up one of these as Primary WAN and the other one as Secondary WAN. in my set up, I am using dedicated WAN port as Primary WAN and the LAN Port 1 as Secondary WAN.

To enable dual WAN option, Go to WAN settings page  and choose "Dual Wan" tab at the top.

here you can switch the Enable Dual WAN On and you can configure your WAN or one of the 4 LAN ports or the USB as primary wan , you can choose the secondary wan in the same way.

There are two options with which you can enable the dual wan

Fail over mode  - When the Primary WAN internet connection fails, the Secondary WAN kicks in and provides you with the uninterrupted internet connection (actually there is 30 - 60 secs delay before the Secondary WAN kicks in). "Allow Fallback" option allows the router to switch to Primary WAN as soon as it is up.

Load Balance mode  - when you choose this option, you can distribute the load between two WANs. i.e one request will use the primary WAN and the other request will use the secondary WAN. in this mode, you can also configure a particular device to use either Primary or Secondary WAN. for example, you can configure your laptop connected to your local network to use the primary WAN and the smart phone to use the secondary WAN always. when you choose this option, you get additional option to route requests through either primary or secondary WANs.

Look at the above settings carefully, by enabling routing rules and adding rules appropriately you can route the entire requests from a particular device through primary wan or secondary wan. In the above setup, my phone( uses secondary wan and my laptop ( uses primary wan.

once you have set up the dual wan options, now its time to connect your second WAN cable to LAN Port 1 at the backside of the router and then use the "Internet Connection" tab to configure the primary WAN and secondary WAN connections.

In the "Internet Connection" page, use Wan type to choose the Primary WAN or Secondary WAN and enter the username/password details the same way you would set up a single WAN connection. make sure you click "Apply" before setting up the Secondary WAN. please know that when you switch the Primary and Secodary WAN connections in the Dual WAN settings page, it will just switch the WAN ports and not the user name/password associated with these connections and both the connections would fail. In this case, you have to again reconfigure Primary WAN and Secondary WAN settings in the "Internet Connection" tab.

once you set up the dual WAN, these changes will be reflected in the "Network Map" .

you can see both the Primary WAN and Secondary WAN are connected now. you can check if it is working by manually plugging out the Primary WAN cable and wait for sometime. the primary wan will go as disconnected first.

After a while you will see both Primary and Secondary as connected. It looks like this is a bug in this firmware version. when the secondary becomes active it shows both the primary and secondary wan status as connected and you cannot tell which one is really used by the router. you can verify which one is active by clicking on the Primary/Secondary WAN icon in network map and see the difference in assigned WAN IP. when the primary is disconnected and the secondary is active, you can see that assigned ip for both Primary and Secondary are same and this tells that Secondary WAN is used by the router.


my primary WAN is ACT broadband which uses Ethernet cable(RJ45) and my secondary WAN is ADSL which uses phone cable (RJ15). I had to convert the ADSL RJ15 to RJ45 to be able to connect to my router as secondary WAN since RT-AC68U does not have an ADSL port. I configured my old adsl modem in bridge mode and connected my modem's LAN output as Secondary WAN to RT-AC68U. I will walk through how to configure the ADSL modem in bridge mode in my next post. stay tuned.  

Please leave your questions in the comments section and let me know if you have any queries related to this router.