Avoid Udp port forwarding in unity [c#] -

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i'm creating simple online game unity 5 , unet;

after following couple of videos introduction i've tried messing around project of video series: http://forum.unity3d.com/threads/unity-5-unet-multiplayer-tutorials-making-a-basic-survival-co-op.325692/.
can create local server , connect using 127.0.0.1, i've tryied friend connect 2 different computers (connected 2 different routers) using public ip of router , port 7777, works after doing udp port forwarding on router.

here question, want able create game , make friends able connect pc don't want people go across port forwarding stuff. i've red upnp don't want use because (if understanded well) it's compatible every router , it's not safe. i've red methods behind udp hole punch you'll need server (and don't have money that).

think solution avoid udp port forwarding? there way can use used udp port microsoft services or stuff that?

in advance!
davide


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