gateway
n. countablen. a way to connect two different computer networks so they can talk to each other. It acts like a door that lets information pass from one system to another.
n. a network node that connects two different networks using different protocols, acting as an entry and exit point for data. It serves as a protocol converter to facilitate communication between disparate systems.
The router acts as a gateway to the internet.
If the default gateway is configured incorrectly, your computer will be unable to communicate with devices outside your local network.
In enterprise environments, a secure email gateway filters incoming traffic to block malicious attachments and phishing attempts before they reach the internal mail server.
From gate + way.
Often used with the preposition 'to' when describing the connection point between networks.