If you dont forward your ports correctly then the masterserver will not ping you.
This means that the masterserver (well it used t be automatic at least) does NOT recognize your server and it cannot be connected to from the internet.
If your ports are not forwarded correctly or not forwarded at all, then if you do the run server command you will get a LAN (Local area network) server.
An LAN server will be only accessible within your own network, that is your house I'm guessing and all computers using its router. Therefore no one outside of your network can connect.
There are situations (sometimes risky :P hehe) where a LAN server can be useful. For example, if you are in high school and your school has an internet network you can set up an LAN server on a school computer. Your friend and you can use this server together as long as all the players are using the school's network. I say risky because if a teacher sees that you are using the bandwidth for a game you can get in some deep shit. :)
This means that the masterserver (well it used t be automatic at least) does NOT recognize your server and it cannot be connected to from the internet.
If your ports are not forwarded correctly or not forwarded at all, then if you do the run server command you will get a LAN (Local area network) server.
An LAN server will be only accessible within your own network, that is your house I'm guessing and all computers using its router. Therefore no one outside of your network can connect.
There are situations (sometimes risky :P hehe) where a LAN server can be useful. For example, if you are in high school and your school has an internet network you can set up an LAN server on a school computer. Your friend and you can use this server together as long as all the players are using the school's network. I say risky because if a teacher sees that you are using the bandwidth for a game you can get in some deep shit. :)