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Q: 

How to detect the NAT type without using STUN ?

I would like to detect the NAT type a network interface is behind, without using an external public server, as it's done in STUN (so, without using STUN clients).

The NAT types I am interested are those as defined in http://www.ietf.org/rfc/rfc3489.txt, section 5 '5. NAT Variations'.

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