There is a bus that runs between the two terminals.
The airport provides a bus service between the terminals at a cost of A$5.50.
Additionally there is an regular bus service between the terminals.
There is also no road connection, or pedestrian access between the two terminals.
A transit terminal has been built between the domestic and international terminals.
At the time, most of the land between the two terminals was undeveloped swamp.
Quickest way between terminals is probably taxi at that time of night.
A monorail between the two terminals is currently under construction.
Rail Europe suggests allowing an hour for transfer between the terminals.
Both companies provide transportation between lots and the terminals.