I am going back to India from Auckland, I wish to make a halt of 72 hours to visit my cousin at Sydney. I don't have any visa for Australia. What is required for this stop over?
You need to apply for a transit visa (my emphasis):
The Transit visa (subclass 771) lets you transit through Australia for no longer than 72 hours if either:
- you need to pass through Australia on your way to another country or
- you need to pass through Australia to join a ship as a member of the crew.
You can include dependent children on your visa application if they are travelling with you on your passport.
You can find out all the information at this website of the Australian Government's Department of Immigration and Border Protection.