![]() ![]() ![]() You all share the same public IP to connect to the Internet. In this case they'd have to forward the port for you, to your router/modem, which probably isn't going to happen.Ī CGNAT basically gives you and a bunch of other people a private IP. It may be that you are behind AT&T's CGNAT. So if you're forwarding a port for a game server, then that server must be running and listening on the port for it to be 'open'. ![]() Otherwise, there is no way to know if a port is 'open' because there's nothing on the port. A program must be actively listening on the port so there is something that actually will establish a connection. If for example in your other comments you forward port 80 but nothing is actually listening on port 80 it won't be 'open' regardless of if you forwarded the port or not. u/RoweDent created this awesome resource on network theory u/tht1kidd_ has created a suggestion post regarding information everyone needs to provide when asking a question about their network There have been some excellent guides written in this sub, and we're always looking for more! If you wish for your flair to be changed, please message the mods and we'll be happy to change it for you. Proof of at least 6 month's history of posting in this subredditĪs a result of this, users are now no longer able to edit their own flair. Your highest level of industry certification, or highest IT related job title held in the last 5 years to a comment you made in the last 6 months, helping someone in the community ![]() To obtain trusted flair for your account please message the mods of /r/HomeNetworking with the following info Trusted user flair has been added as a means of verification that a user has a substantial knowledge of networking. Please flair your posts as Solved, Unsolved, or simply Advice. If you can't find what you're looking for with the search function please feel free to post a new question after reading the posting guidelines
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