Dodo ADSL usually offers PPPoE authentication. Please consult your ISP if you are not sure you use PPPoE.
To set up, log into the modem using your WEB browser: type http://10.1.1.1 in the address bar and press Enter. Enter username 'admin' and password 'admin' (default setting).
Go to Quick Configuration page.
Set Refresh Rate to 'No Refresh'.
In the Operation Mode select PPP.
In the Connection Type drop-down menu select PPPoE profile.
Enter username and your password.
Select CHAP under Security Protocol (check with your ISP if not sure).
If you have connection with static IP address, you do not have to specify the IP settings on the modem: the modem will be getting the same IP from the provider every time it connects and passing it on to your PC/router.
Click on Save & Reboot button to save settings.
Give the modem a minute or two to reboot and reconnect. Restart your computer and you should be able to access the Internet.
You do not have to run any login client on your computer because your modem logs to your ISP automatically.
If you are using a router: you do not have to enable PPPoE on the router (set it to Dynamic IP) because your modem logs to your ISP automatically.