Sometimes you need to access a Raspberry Pi without connecting it to a monitor. Perhaps the Pi is embedded in something like a robot, or you may want to view some information from it from elsewhere. Maybe you simply don’t have a spare monitor! You can find more information on accessing your Raspberry Pi remotely here. There are number of ways to get connected to your raspberry Pi over the internet from another computer or a mobile device.
One of the method is by using port forwarding on the router. To set up port forwarding, you must change the configuration of your router to forward all inbound traffic from the internet on a specific port to the local IP address of your Raspberry Pi. Most routers have this feature available. However every router is different, so you will need to consult your router’s user manual for instructions. The settings can be tricky if your Pi is behind a firewall or if there is more than one router. One disadvantage of port forwarding is that it exposes a network port on your private LAN to the public internet. This is a known security vulnerability and must be managed carefully.
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TeamViewer beta just came out and I’ve been using it on an rpi3 w/ Jessie. It was super simple to install and I didn’t have to mess with port forwarding at all. Might not be everyone’s solution, but to quickly screen share an rpi screen it seems like one of the quickest ways.