User blog comment:Kogath/Monster Hunter 4 Ultimate for the Nintendo 3DS/@comment-6649123-20150212232845/@comment-25201690-20150213024630

Without a UPnP punchthrough in the router theres no way that I know that you can bypass it without just simply using a different internet connection that does. If you can maybe play a local play with someone via StreetPass you can set up to have your 3DS StreetPass(page to StreetPass through pc)through your computer, but I'm not sure if thats how the local play actually works or not.