Test asymmetric to asymmetric NAT holepunching

Testing NAT holepunching is difficult because you need two participants each behind a different NAT.

I am able to test it using my mobile connection for one party and my home connection for the other one. But in the country where i live mobile networks are symmetric (unfriendly). Which means i am only able to test symmetric to asymmetric (probabilistic) holepunching.

Asymmetric to asymmetric is much simpler. But it is not yet tested and there could well be bugs in the implementation.