Simple n00b question. I have searched the forum but found no specific answer.
If I have a gateway on a network do I have to open any incoming ports on the router to allow a connection from outside the local network?
For example, I am currently running a gateway at home. It is connected to my home network and working well. However, I wonder if I need to configure my home router to allow something from outside to establish a link with the gateway. Later I will move the gateway and connect it to a cellular modem. The same question applies.
I’m looking for a clear yes/no answer, but I’d be happy with “it depends” with a list of reasons why I might want to open a port, and the consequences if I don’t open any.