Setting up DDNS to rotate through modem + router

Forget the No-IP and DynDNS! Make your router work in bridge mode and configure DDNS with DNS-O-Matic.


Warning: This Post has some technical concepts will be addressed.

It all started when I got the operator Hi a Technicolor TD5136v2 modem/router Wi-Fi, Very bad! Bought so the router Asus RT-N56U to see if it improved the Wi-fi signal, minimizing data loss.

To facilitate my life, My Network cascateei, putting the Asus router connected right to the router Technicolor. IE, my home network was with 2 routers. Has worked so well, but I had to configure the NAT (port forwarding/services) on both routers to do my IP camera work outside (Internet). See the example of how it looks:

INTERNET      > MODEM/Hi    > ROUTER/ASUS > COMPUTER/CAMERA  > > > 192.168.0.N

The problem with this “gambi” was in the DDNS. I believe that you know what is a DDNS, that's why I came here. Otherwise, Please do a little research and continue reading.

Note that, with this cascade I did, the modem/Hi is who had to interface with the Internet and picked up a valid IP, have the router/Asus received only the cold coming from the IP modem/Hi. It really was a problem, because when I tried to configure DDNS/Asus router, He gave the following error:

"The wireless router currently uses a private WAN IP address (192.168.x.x, 10,x,x,x, or 172.16. x.x).. This router may be in the multiple-NAT environment and DDNS service cannot work in this environment"

The website of the ASUS alerted to this problem:

Note: If wireless is using a private WAN IP address (192.168.x.x, 10.x.x.x, or 172.16.x.x), This router find-If-a multi network-layer NAT. The DDNS service may not work in this type of environment


The solution was to make the modem/Hi work in “mode bridge” (Bridge mode), IE, the modem/Hi just became your role as modulator and demodulator (and no more of router), relaying all data flow straight to the router/Asus. In this scenario, It's as if the router itself/Asus to have your Internet facing interface, obtaining valid IP WAN and being responsible for making the PPPoE authentication. Look there:


Connecting the modem and the router (Bridge mode)

In This Post, Although refer to the modem of Hi and Asus router, the configuration can be similar in any modem or router.

Step 1 – Put the modem in bridge mode (Bridge mode)

Go to the control panel of the modem/Hi. This is typically done by opening your browser and typing (or another IP as,, etc). The default username and password is “Admin” for both. Search and change the following configuration:

SETUP > Internet Setup > Internet Settings > Internet Connection Type > Bridge Mode (instead of PPPoE)

Step 2 – Connect the network cable between the modem and the router

Take a common network cable (UTP – RJ/45) and connect between devices: one end goes in one of the 4 modem/Hi ports and the other goes in the WAN/Internet port of the router/Asus.

Step 3 – Configure the router to operate with DHCP enabled

Access the router control panel/Asus. This is typically done by opening your browser and typing (or another IP as,,, etc). The default username and password is “Admin” for both. Search and change the following configuration:

Advanced Settings > LAN > Basic Config > Enable the DHCP Server > Yes

Step 4 – Configure the router to do PPPoE authentication

Access the router control panel/Asus. Try and make the following setting:

Advanced Settings > WAN > Basic Config > WAN Connection Type > PPPoE
Advanced Settings > WAN > Account Settings > PPP Username > Hi@Hi
Advanced Settings > WAN > Account Settings > Password > oi123

This PPPoE username and password is Hi standard. Obviously you should use another user and password if a different operator. If you do not know, just call your operator and ask for the login data for authenticating PPPoE. Hi phone is 10631.

Done that, It's for your Internet to be working through the Wi-Fi router/Asus. Sometimes it can take a while to authenticate and establish the connection, have patience. I say this, because it happened to me; I thought it wasn't working and it was just wait a little longer it worked. Tests there!

Creating and configuring a DDNS

In fact this is the best part of the Post, because I accidentally met an interesting service called Dns-O-Matic. Easy, I explain!

The big problem of routers is to support few DDNS servers, generally limited to No-IP and DynDNS. But forget the No-IP and DynDNS! These services are not fully free or when they are, have limitations, like having to renew every 30 days and it sucks!

I personally prefer to use the Afraid (FreeDNS), It works and it really is free. But how do if the router does not support the Afraid? This is where DNS-O-Matic. Luckily the Asus router supports DNS-O-Matic, that allows you to associate my own DNS-O-Matic to my subdomain created in Afraid, keeping my WAN IP always updated. Don't understand? We will by then, but remember that this will only be useful if your router has support for DNS-O-Matic.

Step 1 – Create a (Sub)domain in Afraid

1. Visit
2. Click "Dynamic DNS" and create an account through the menu "Setup an account here".
3. Login, Click the "Subdomains" and "add"
4. Note in the combobox "Domain" that, at the end, has an option "Many many more available ...", Click there!
5. On the next screen, Click on the link "Shared Domain Registry" and choose one of the thousands of domains available.

Step 2 – Getting the key (Me?) in

(You will need this key forward!)
1. Visit
2. Click the Dynamic DNS,
3. At the end of the page, Click on the link “Direct URL” for the subdomain you created in step 1
4. The key (Me?) is the part of the URL immediately after “update.php?”.

Direct URL: * GTWG8yR0lBS7TRjlmOjEzMDY5NIDf
Key (Me?): iXU5V6yRRjBGa*GTWG8yR0lBS7TRjlmOjEzMDY5NIDf

Step 3 – Create an account in DNS-O-Matic and add a service (Afraid)

1. Visit
2. Click on "create a free DNS-O-Matic account" and create an account
3. Login, Click on the button "Add a service"
4. In combo “–Select a service–“, choice “”
5. In the Key field(?) Paste the key for the subdomain created in step 1.
See how to get the key in step 2: “Getting the key (Me?) in”
6. Click on the button “pdate account info”

Step 4 – Configuring DNS-O-Matic on the router

Try and make the following setting:

Advanced Settings > WAN > DDNS > Server > WWW.DNSOMATIC.With

1. In “Server”, Choose WWW.DNSOMATIC.COM
2. In “Host Name”, place “” (or leave blank)
3. In “User Name or E-mail Address”, inform your user created in DNS-O-Matic
4. In “Password or DDNS Key”, notify your DNS account password-O-Matic
5. Finally, Click on the button “Apply”

See Figure:

Doing this, DDNS/Asus router, through the DNS-O-Matic, automatically will update the WAN IP by the Afraid.

That's it, Now you have a free domain with always updated IP! Never No-ip, never DyDNS.

Good luck!

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4 comments on “Setting up DDNS to rotate through modem + router

  1. Leandro Santos (Link) said:

    Congratulations for the Post my dear!
    I was trying for a long time to make my router work and with your tip was very easy.
    In my case I used the same DDNS.



    Good morning. Great post, however I use live fiber and if I put in bridge mode I turn off the telephone line and remote support of the modem. You know how to do it any other way?

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