The Port Forwarding Rules tab displays the current port forwarding rules in effect for the instance. Port forwarding is used to enable communications between external hosts and services offered within a VLAN (virtual local area network) in a private cloud. As a common use case, you could use port forwarding rules to enable external hosts to access SSH or HTTP services on a specific instance and port in your VLAN. Port forwarding is often known as port mapping, because a request on a public port gets mapped to a private port number. The port can be the same on both sides, or mapped from any open external port to any open internal port. Unlike port forwarding in traditional computing, in virtual environments (such as cloud infrastructures that support port forwarding capabilities) you can have multi-tenant IP addressing. That is, a virtual instance in the cloud could support more than one IP address. This offers a lot of flexibility on how to forward network traffic for a given IP:Port combination, and is also why both an IP address and Instance name are required when configuring port forwarding rules.
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