Finally, after few weeks.. subscribed to TPG ADSL2+ 150gb/mth plan. Geez I thought it's difficult to setup a network in mac. I purchased Netgear DG834Gv4 Modem router. Review said it's better compared to D-Link DSL-G604T, and checked out that it's just different by $4 *promotion in JB-Hifi. At first I was kinda doubt. D-link package cover mentioned it's compatible with mac, whereas Netgear didn't state clearly (though it said any OS with TCP/IP compatible).
Once home, plugged to the mac, connect the ethernect cable and trying to setup the router (Although DSL is not activated yet). In the beginning there's a confusion. Mac didn't read the cable. It's stated unplugged. WTF, I thought either my mac ethernet socket or the cable was broken, but I could connect to the modem setting via web interface.
Few days afterward, I received an email from TPG that my DSL account has been activated. My joy didn't last long however. I tried to connect the modem to the wall socket, and the DSL light is not blinking. Something went wrong, so the next day I went to buy a home phone set, which in the end turned out the old converter connected to the wall socket was spoiled. Therefore I replace the converter with the new one coming with the phone. Regarding the ethernet cable issue, I realized I have to use slight force to ensure the cable is plugged, but in the end I prefer to go wireless.
Setup complete.