discovery - How to detect the NAT type without using STUN? -

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I would like to detect nat type behind a network interface without using an external public server, as it did in STUN (Hence, without using STUN clients).

I am interested in NAT type, as defined in them, section 5 '5 NAT variations'

The bad news is that you can not (I'm assuming that you do not have NAT Telephone network of all network administrators who plan to deal with you)

To find the type of a NAT, you must have a tool ping hole on the van behind the van.


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