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Remote Control Your DHCP Connected Laptop from Your iPad
Authored by: macsadmn on Feb 15, '11 06:19:27AM

Actually, I could ask our admin for a fixed IP, but it would only be helpful for when my laptop is in my primary office. There are times when my laptop is at my secondary office. Additionally, there have even been times when I have been working on a project in a building data closet and then gotten called off to go to another building. Instead of packing up the laptop, I can just grab my iPad and still have the ability to remote back to my laptop if needed.

The need for VPN use at home is because we use private IP addresses on our work LAN's - not public IP's. I only use VPN when I'm off of our WAN (a primary purpose of VPN). To help clarify, picture this layout for multiple sites on a WAN: building/LAN #1 has an IP scheme of 10.1.x.x, building/LAN #2 has an IP scheme of 10.2.x.x, ..., building/LAN #10 has 10.10.x.x, etc.. In our case, all sites are connected by fiber or wireless and we are able to route non-broadcast traffic across the WAN. By using VPN on the outside, we get dropped onto a "LAN" that allows us access to our WAN.

I should also add that the part of the hint about tracking external IP address changes is merely a "bonus" for those people that would like to know when their public IP changes. If you are connecting from within the same WAN, or via VPN, you do not need to add that to your script. For the true intent of the hint, It is not at all necessary to include the "bonus" in the script.

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Remote Control Your DHCP Connected Laptop from Your iPad
Authored by: Mac Berry on Feb 15, '11 07:52:34AM

OK thanks, makes sense.

I have no experience of WAN's! For me, there's a LAN, then the internet, so I'm either on the LAN or I'm not!

OK, so the hint is extremely useful if you find yourself leaving your laptop in differing locations within a WAN, causing your private IP to change, but that's the key point if I'm understanding properly - it's only useful in that situation. If your "server" is either outside your own WAN/LAN (eg at a client's location, or as in my case, my daughter's laptop being in any one of several places at and around uni), knowing the private and public IP's won't help one bit, because you still need a way to access the WAN/LAN it's on remotely, such as VPN or port forwarding.

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Remote Control Your DHCP Connected Laptop from Your iPad
Authored by: macsadmn on Feb 15, '11 08:34:01AM

You are correct. However, if you're looking to support your daughter remotely, I would definitely check out TeamViewer. It is free for personal use. If you're looking for a free way to remotely support business clients, you might consider Mikogo ( It is a bit less user friendly than TeamViewer, but it's completely free. The disadvantage is that there is no iPad support :-( Hopefully the developers will add an iPad app at some point.

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