Monster Hunter Freedom Unite (MHFU)

[Zed_Acid]

Forum doesn't let me post links to anything clickable, I'll try explaining it in short:
Main screen says no IPv4, just the long-ass IPv6 hex code
Network Screen correctly displays IPv4 IP and MAC, and the LAn computers with their different ones (My wife's and mine)
UPnP setting is activated, and it seems to hold (pretty sure the router ignores it though, I tried this in the past for other reasons, and it didn't have any (notable) effect)

I tried just now, Tunngle has the UPnP setting on as well, restarted both Tunngle and Router, still yellow face.

Another thing I have come across is the PPSSPP's MAC address, is it beneficial to enter my (our) actual MAC into the .ini?
We did make sure everyone has their own, different generated one though, not sure if it makes a difference.
The manual addition of the MAC address into the .ini seems to be in the outdated guides and posts, the pinned one says to just generate one.

Still certain I'm just being stupid and forgot / overlooked something, but I still can't figure it out.

Edit: I dove into my stupid box and ISP again, and I absolutely can't port forward IPv4, only IPv6. The UPnP is obsolete for this, I have learned, the function indeed doesn't do jack because the thing runs IPv6.
I could force them to switch to IPv4, but then I need another box just so my wife can access the internet.

I may just do that, or just outright switch ISPs, but we can't now for personal reasons (we will move in a few months and have to get a new ISP anyway then, no sense doing it now only to switch again soon).

I will still try out stuff and everything, but I'm afraid this is what bones us with MHFU. If it's the port forward, I mean.

Only option then would be to get my friend to host and do all that, but I don't know how far we get with that, since we can't even have a two way connection when I'm not hosting (even though everything is set up, correct IPs and everything)

Edit again: Got to go to work now, will check back in the evening. Hopefully when the wife and friend are back too so we can test stuff.