Screen Sharing guide Part 2
Setup when NOT using Back to My Mac
Setup when not using Back to My Mac is a little more difficult but you wont need a network certification to figure it out. To get Screen Sharing working on a Mac without the use of Back to My Mac you need to enable screen sharing as well as ensure that the router is setup to allow for screen sharing. First, lets enable Screen Sharing on your Dads Mac like we did in the previous example: on your Dads Mac, click on the Sharing icon in the middle row on the right in the System Preferences screen. Then click on Screen Sharing. Thats it!
You dont need to remember any of the information on this screen like the computers name or the IP address. This simply enables screen sharing, and the rest of the setup is done on the router. First, we need to know the MAC address of the Ethernet port on your Dads Mac. In System Preferences click the Network icon which is again in the middle row in the middle of the row. On the left column click on the Ethernet item then on the lower right click on the Advanced
button. On the next screen, click on the Hardware tab across the top on the right and then write down the MAC Address (you will need this shortly). Close out of System Preferences. Next you will need to setup the router.
The router needs to be setup to allow screen sharing. Im going to explain how this is done for the Apple AirPort Extreme Base Station (router). Basically you need to allow the Screen Sharing service as well as route the screen sharing service to the Macs private IP address. All of the setup is done through the Apple AirPort Utility which is under Applications->Utilities. Launch the AirPort Utility and then click on your AirPort router from the list and click Edit then click on the Network tab across the top:
On this screen we will first setup a static IP address for your Dads Mac, then use that static IP address for the screen sharing service. Under the DHCP Reservations box click the +. In the screen that pops up, enter the MAC address that you wrote down from the Network screen into the MAC Address box. Write down the numbers exactly as they appear in the IPv4 Address box (in the example screen shot above my numbers were 10.0.1.2 for my Dads iMac Ethernet), and finally enter Dads Mac or similar into the description field (you can put in anything you want into this description field, its only there for your benefit). Now click the Save button.
Next, on the same screen, click on the + under the Port Settings box. You will see a screen like the one below:
Click on the arrow on the right side of the Description box and select Screen Sharing VNC as shown below:
All of the fields get filled in automatically however you will need to change the Private IP Address field. Click on the Private IP Address and change it to be exactly what you wrote down when you setup the static IP a moment ago remember in my example it was 10.0.1.2 for my Dads iMac. Leave the rest of the fields alone and click the Save button. Then click the Update button. Your Apple AirPort router will then restart. When it comes back and reconnects, go back into the screens that we were in before and verify that everything is setup the way we want it. Sometimes it doesnt stick the first time, so redo anything that isnt right (remember to Save your changes). When done, quit out of Airport Utility.
You will NOT be able to see your Dads Mac in the Finder. Thats some of the magic of Back to My Mac. So to connect to your Dads Mac we will do manually. First, we need to know the IP address that is assigned to your router. Launch the AirPort Utility again and click on your AirPort router from the list and click Edit. Next, click on the Internet tab across the top and write down the IPv4 Address something like 77.176.255.147. This is the IP address that is currently assigned to your router and it might change, but wont that often. After you have written down the routers IPv4 Address quit out of AirPort Utility.
Next, open a Finder window and then hold the Command key down and press K (Cmd+K) which opens up a screen that looks like this:
(continued next post....)