Tuesday 20 August 2013

DNS Setting

DNS Logo 
In the computer network term, Domain Name System (DNS) is used to resolve the host name into an IP address. E.g. you open your browser and you want to browse google.com. Once you typed in google.com into you browser, the DNS will start its job. The DNS will send a DNS request to the DNS server, it requests the IP address of the google.com to the DNS server. It was merely like your computer asking the DNS server “Hi DNS server, I need to go to google.com, could you tell me what is the IP address of google.com ?”. Then, the DNS server will reply, “Hi there, the IP address of google.com is” Thus, after your computer knew what is the IP address of google.com, it know where to go.
Normally, the DNS server addresses is automatically provided by the ISP. Thus, the ISP could control some websites that they want to block. They could control which website that you can go into and which website that is restricted. Some of the common blocked websites are porn sites, torrent site, and warez sites. Even though, this feature offers good things. But, sometimes you do not want to be restricted.
One of the trick to be unrestricted is by simply use another DNS server. There are a lot of parties that offering the DNS services, such as OpenDNS and Google. Some of those providers will charge you for the services. While, if you want to use a reliable and free DNS service, Google OpenDNS really will do. If you would like to know further about Google OpenDNS, you should check their official site here.
Advantages of using Google OpenDNS are:-
  1. Totally FREE.
  2. Speed up your browsing experience.
  3. Improve security by preventing several attacks such as Denial-of-Service (DOS) attacks and DNS cache poisoning.
  4. Gain access to the websites that is blocked by your ISP.
FYI, Google OpenDNS addresses are and
If you want to use Google OpenDNS you could either set it up on your computer’s network configuration or on your router directly. If you just set it up on your computer, that means only your computer alone that will gain the advantages of using the Google OpenDNS. While, if you set it up on your router’s configuration, every single computer that is connected to the router will also gain the advantage of using Google OpenDNS. Thus, if you have hundreds of computer that is connected to the router, all computer will automatically use the Google OpenDNS as their DNS server, but it only applicable if the DHCP is enabled.
In this post, I will specifically talk about how to configure the Google OpenDNS on the Innacomm W3400V routers.
Step 1
  • Ensure that you were connected to the router.
  • Open a web browser and go to the router’s management console, the default address is Innacomm Login Page
  • Log in to the router’s management console by using tmadmin credentials.
Step 2
  • Go to Advanced Setup > DNS > DNS Server.
  • Tick on the Use the following Static DNS IP address.
  • Fill in the Google OpenDNS address on the Primary and Secondary DNS server fields.
  • Then click Save/Apply.
Innacomm W3400V OpenDNS

How to Configure Port Forwarding on Innacomm W3400V ?

Innacomm W3400V
Port forwarding enables users or certain applications to gain access to a computer or a server on a specific ports. For example, you have a web server which is served the web application on port 8080 and then you want other people to be able to access your web, but only from web browser, that means other people can just open their web browser, type-in the URL address i.e. http://www.myweb.com, without specifying the port details.
To configure port forwarding on Innacomm W3400V:-
1. Ensure that you were connected to the router.
2. Open a web browser and go to
Innacomm Login Page
3. Log in to the router management by using tmadmin credentials.
4. Click Advanced Setup > NAT > Virtual Servers on the left-hand side menus.
NAT - Virtual Servers
5. Once the NAT – Virtual Servers Setup page is loaded, click Add.
6. Tick the Custom Service, specify the name for this configuration e.g. My_Web_Server.
Add new entry
7. On the Server IP Address field, you need to specify the targeted computer’s or server’s IP address e.g. So, you should configure you computer or server with a static IP address instead of using DHCP IP address.
8. On the External Port Start field, you have to specify the port number that you want to be accessible from outside network e.g. port 80.
9. If you want to have multiple accessible ports from outside network, you have to specify the end range of the port on the External Port End field. E.g. you want to have accessible port from 80 – 90, then you need to type-in 90 on the external port end field. On the other hand, if you just want to have one specific accessible port, you just need to type-in the same number as the number on the External Port Start field e.g. 80.
10. Specify the protocol on the Protocol drill-down, you can choose between TCP,UCP,or both TCP / UDP.
11. Specify the destination port (the port on your computer that runs for that particular service) on the Internal Port Start e.g. 8080.
12. Similar with the  External Port Start, if you have a range of internal ports, you have to specify the last port in the range on the Internal Port End field e.g. 8090. But, if you only have one external port, this field will be disabled automatically.
13. Once you have done, click Apply / Save.
14. Your new entry will be listed on the NAT – Virtual Servers list.
NAT Lists

How to Change Innacomm W3400V User’s Password ?

Innacomm W3400V
To change Innacomm W3400V user’s password:-
1. Connect your computer with Innacom W3400V router, either through LAN cable or Wireless connection. I suggested you connect through LAN cable, since the connection is more stable.
2. Open a web browser, e.g. Chrome or Mozilla.
3. Type in on the address bar.
4. Log in to the router’s management console by using tmadmin credentials. Username is tmadmin and the password is tmadmin.
Router Login Page
5. Once, you been logged in, click Management on the left-hand side menu, then click Access Control and then Passwords.
Change Router's Passwords
6. An Access Control – Password management page will be opened. On the page, select which user’s password that you want to change by selecting on the drill-menu on the Username field.
7. Type-in the current user’s password on the Old Passwords.
8.Specify the new password on New Password and Confirm Password fields. For the password, ensure that the password do not contain any special characters, such as ~!@#$%^&*(). Even, the system accept those characters for your new password, but the log in page will reject those characters. Thus, you will not able to log in to the router any more. In case this happened, please proceed to this post, How to Change Innacomm W3400V User’s Password through SSH ?, to reset back your password without even resetting the router’s configuration.
9. Click Save / Apply, then you will be automatically logged out from the page and will be directed to the log in page.
10. Try to log in with the new user’s credential.

What is Innacomm W3400V Default Usernames and Passwords?

Innacomm W3400V
Innacomm W3400V is a free wireless modem router given by TM for the Streamyx subscriber.
Basically, there are three users inside the router, which are tmadmin, tmuser, and support. So far, I have not found out the password for support. Thus, usernames and passwords for Innacomm W3400V are:-
1. tmadmin, password: tmadmin.
2. tmuser, password: tmuser.
You can use those credentials to log in to the router either through web browser or SSH.

How to Change Innacomm W3400V User’s Password Through SSH?

FYI, Innacomm W3400V is a free ADSL Modem + WiFi Router from Streamyx.
This modem + router have been branded by TM, so it have its own log in page. The funniest thing is the log in page is do some JavaScript to check whether the username and password specified contain any special characters, such as !@#$%^&*. So, that means you cannot use any special character on your password. But, if you try open the configuration page and change your password using special character, it will accept it.
The problem starts here. I have changed the admin user password on my router using special characters. So, every time I tried to log in, it always says the password is wrong, authentication failed, and so on.
So, I tried to find a workaround to change the password back, without go through the log in page.
1. Open PuTTY . PuTTY is a Windows based SSH / Telnet client and it quiet useful, if you do not have it, you can Google it and download it for FREE!.
2. SSH to your router, enter your router IP address, normally it should be

3. Once you connected, it will prompt you for username, just type in the username that you want to change the password e.g. tmadmin
4. Then, it will prompt again for password, enter the password.
5. If you have successfully authenticated, the Main Menu will appear.

6. Type passwd <option> <new_password> e.g. passwd admin password then enter.
7. There are 3 options for passwd command, which are admin, user, and support. Normally the username for admin is tmadmin, for user is tmuser, and I don’t know the username for support.
8. After that save the configuration by type in save and enter.
9. Reboot your router, either reboot it by turn it off and turn it on again or type in reboot.
10. Open your browser and open router’s web config. Log in with new password.
VOILA! You have changed the password!



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