Connect from external to VNC via external.

To access Raspberry Pi connected to the router, you must first detect the IP of the router.
Make sure that the IP of the router is either static IP or know IP.

How can I create a static IP address?
1. Apply a fixed IP to the Internet company that accessed it first.(This method suggests that the server will be used for keungyeongu because the price will be added.)

2. Use DHCP if you use most of the shares or home Internet.Thus, IP is constantly changing, and most of the time, it is still available with IP once the computer has been put on hold.
If it stays on for a long time, it might occasionally renew IP, but it has not changed for about two months.

There are several ways to find IP, but the easiest way

www.whatismyip.com

Connect and find out the ip.
Of course, vnc must be installed on Raspberry Pi.
Since we need to connect to rajeu via a shared router, we need to set up the router's first setting.

Entering the Settings pane of the router (mostly entering a shared router) enters the last number of entries in Internet Explorer (one or more of its private IP addresses in Internet Explorer).)
Locate and add port forwarding on the 
router.

Port of VNC uses 5901, 6001.
Save and save.

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Ready to connect externally.
Run the VNC client on the external computer first.

Type and save the actual IP in the VNC server after entering ' :: ' and then the port number.

Click rasp to enter the ID and Password when entering the ID