Australians travelling to Vietnam require a visa, which can be arranged through the Vietnam embassy or consulate or after obtaining a letter of approval, picked up on arrival (though this can be somewhat disorderly). Tourist and business visas are available.
Local business contacts can issue a letter of invitation or even submit visa applications to the Vietnam Immigration Department, who can instruct the Vietnamese Embassy or Consulate in Australia to issue the visa. Passports are required for domestic flights and must be presented at hotels.
For further information please contact your nearest Vietnamese Embassy or Consulate prior to arrival.