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Garena is a vpn software that allows you to connect to players around the globe. Best example of a software to use is GARENA. VPN HOSTING - this means you must have a specific software to use to host your DOTA game so friends can connect to you even if they are not under the same LAN or router. Or you can turn off windows firewall as a workaround each time you play DOTA. If your friends is not able to see your game, make sure that your windows firewall has Warcraft TFT in its exceptions. All you need to do is go to Local Area Connection in Warcraft TFT then create the game you want to host.
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LOCAL HOSTING - this means that you are hosting a game to PCs connected to your LAN under the same router. To be able to HOST a game in dota, you need to either be in a network or in a virtual private network. If playing DOTA is the reason why you want to forward a port from your dlink router, I don't think that it is going to be necessary.
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