It seems some Australians think it onerous to have at least 6 months validity in their passports to visit Indonesia on a VOA or Tourist Visa.
According to the Australian Immigration website the following is required from an Indonesian wishing to visit Australia....
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Each applicant, including dependent children, must apply on their own form.
The visa application fee. See 301 Moved Permanently
Certified true copy by our Service Delivery Partner (Australian Visa Application Centre (AVAC)) of the biodata and visa pages of your passport.
One recent passport sized photo of the visa applicant.
Birth certificates and for Indonesian nationals, a copy of your family card (Kartu Keluarga) and a copy of your Identification card (KTP).
Form 956 / 956A if you are authorising other party to communicate with DIAC.
If you are employed, evidence of your employment. This is usually a statement on company letterhead from your employer stating your job role, length of employment, salary, and the period of approved leave. If your employer is financially supporting your visit, this should also be mentioned on the reference letter. If you are self-employed, you need to provide evidence of your business ownership (such as the business registration or shareholder’s certificate).
If someone is supporting your application, a supporting letter from this person outlining the purpose of your visit, the length of your stay, the nature of your relationship with them, and the type of support they will provide (eg. financial, accommodation etc). If this person is in Australia, evidence of their status (eg. copy of Australian passport/visa).
Evidence that you have enough money (funds) or access to enough money to support yourself (and any family members travelling with you) for your stay. For example, a current bankbook or bank statements for the last 3 months. Cash or credit cards are NOT sufficient evidence of funds.
If you are under 18 years old and:
Travelling without both of your parents, Form 1229 and parents’ copy of identification cards; or
Travelling with one of your parent, Form 1229 and this parent copy of identification card.
If you are over 75 years old, medical examination (form 26) from our Panel Doctor and Travel Insurance covering period of your proposed stay in Australia.
Any other evidence which supports your application.
In some cases, you may be requested by us to do a medical check. See the health requirements webpage for full details.
For Business Visitor stream: An invitation letter from the Australian business/organisation who are supporting your visit, which states why you are required to be in Australia, and what you will do in Australia.
For Tourist stream: If you are visiting a relative or other family member in Australia – evidence of your relationship with that person. For example: marriage certificate(s), birth certificate(s), statement detailing the nature of relationship, or a combination of these documents.'
edit: Other countries in Asia requiring 6 months passport validity....
The six-month validity requirement is quite common on the Asian continent. Among other countries, Burma (Myanmar), China (including Hong Kong and Macau), Laos, Indonesia and Malaysia require six months' validity from the date of entry. India requires at least six months' validity from the date a traveler applies for an Indian visa.