Tunngle allows you to easily play your Local Area Network (LAN) games online over the Internet which means it allows you to use the Local Network Menu of your games to play your Multi-Player games on-line.
I'm really confused about posting this whatever, I got a struggle with this program and I'm searching one of you guys who could help because their forum aren't that active and their support pages doesn't help as well.
Thanks.
Make sure Tunngle's network adapter (driver) was installed, is present and is enabled - "cable unplugged" state.
Set the correct network priority (important for old games): https://support.microsoft.com/en-us/help/2526067
Make sure your Windows doesn't block anything (disable/add excludes to Firewall in Windows 7; Windows 10 firewall by default blocks LAN games too)
You know why those people don't answer? Because you don't ask any questions. You say you struggle with it, but you don't say why. You don't say what is broken, you don't list things you've already tried, you don't list logs, nothing. How would anyone ever be able (and willing) to help you?