Feeds

VPN security - if you want it, come and get it

Attention WiFi hotspotters: You want it

  • alert
  • submit to reddit

Next gen security for virtualised datacentres

Housekeeping, subnets, and domain names for dynamic IPs

You'll need a trusted server with an always-on connection to the net. We can't stress enough the the server needs to be free of malware and be connected to a network you trust. We used a home machine with broadband, so these instructions are tailored to that arrangement.

Step 1: Housekeeping

Before installing and configuring OpenVPN, you'll need to take care of several housekeeping items necessary to make the program work smoothly. First, if your client is running on a local area network, make sure its subnet isn't one of the more common IP numbers in use. A bevy of home routers use 192.168.1.x by default, and this will almost certainly pose a problem. If you go to a Wi-Fi hotspot that uses the same subnet as the one used by your server, there will be conflicts and you will be unable to connect.

To prevent this problem, renumber the subnet connected to your server machine to one of the more obscure numbers. We picked 192.168.199.1, but as this list makes clear, there's no shortage of available of private IPv4 addresses to choose from. This is how the configuration page of our Linksys router looked after the change.

Linksys router with settings

Change the subnet to 192.168.199.1

While you're still in your LAN settings, identify a chunk of addresses in your subnet that won't be used by any other machines connecting to the network. We picked 11 addresses starting at 192.168.199.151. Jot this information down. You'll need it later.

Step 2: For Servers with Dynamic IP Addresses

If the IP address of your server machine isn't fixed and you don't already have one, you'll need a domain name mapped to the IP address of your server machine. (If the server has an IP address that never changes, you can skip this section and proceed to step 3.) DynDNS allows you to do this for free using their Dynamic DNS service.

You'll need to create an account that includes a username and password. Be sure to pick a strong combination and keep it handy, because you'll need it in a moment or two. Now, log in to the account you just created and choose the Add Host Services link. This will allow you to create your very own domain name that will automatically map to your server machine. To do that, type in a domain name, select the "Offline Hostname" option, and click on the "create host" button at the bottom of the page.

Add Host Name section of DynDNS site

Choose a domain name to map to your server

We chose the domain name openvpndemo.dyndns.org. You can pick whatever you want, as long as no one has beat you to it. Just be sure to remember what the domain name is, because you'll need it later in the configuration process.

Now, download the DynDNS Updater software from this link and install it on the server machine. Choose the default setup options. When it opens for the first time, you'll be prompted for a username and password. Enter the username and password you just established when you created your DynDNS account.

Login screen for DynDNS Updater program

Enter the username and password for the account you just created

Once you enter the username and password, DynDNS Updater will display the domain name you just created in the "Dynamic DNS Hosts" section. Check the box and click the "apply" button.

DynDNS Updater configuration page

DynDNS configuration page

Presto, you have now set up a domain name for your server machine. Each time its IP number changes (assuming its a dynamic setup) DynDNS will update the domain name accordingly. The DynDNS icon should now show in your system tray.

(If you're having problems with this step, DynDNS offers their own instructions here.)

The essential guide to IT transformation

More from The Register

next story
Goog says patch⁵⁰ your Chrome
64-bit browser loads cat vids FIFTEEN PERCENT faster!
Chinese hackers spied on investigators of Flight MH370 - report
Classified data on flight's disappearance pinched
NIST to sysadmins: clean up your SSH mess
Too many keys, too badly managed
Scratched PC-dispatch patch patched, hatched in batch rematch
Windows security update fixed after triggering blue screens (and screams) of death
Researchers camouflage haxxor traps with fake application traffic
Honeypots sweetened to resemble actual workloads, complete with 'secure' logins
prev story

Whitepapers

Top 10 endpoint backup mistakes
Avoid the ten endpoint backup mistakes to ensure that your critical corporate data is protected and end user productivity is improved.
Implementing global e-invoicing with guaranteed legal certainty
Explaining the role local tax compliance plays in successful supply chain management and e-business and how leading global brands are addressing this.
Backing up distributed data
Eliminating the redundant use of bandwidth and storage capacity and application consolidation in the modern data center.
The essential guide to IT transformation
ServiceNow discusses three IT transformations that can help CIOs automate IT services to transform IT and the enterprise
Next gen security for virtualised datacentres
Legacy security solutions are inefficient due to the architectural differences between physical and virtual environments.