Optus ADSL usually offers PPPoE authentication.
Step 1: Login to your DrayTek router. [See the Quick Start Guide included in the box for instructions or download it from our downloads page]
Step 2: Go to Internet Access
Step 3: Select PPPoE/PPPoA and “Enable” this profile
Step 4: Please make sure your “DSL Modem Settings” are:
Encapsulating Type: LLC/SNAP
Step 5: Set PPP Authentication set to “PAP Only” (not the default “PAP or CHAP”).
Step 6: Setup your username and password, as supplied by Optus.
Step 7: Click the [OK] button.
After 3 secs to 5 mins you sure have access to Internet. You can also go to Online Status to check your WAN status.