How to use VPN Reconnect

Roaming users generally rely on VPNs (virtual private networks) to provide a secure connection between their computer and the internal company network. You don’t have to know how it works, but it’s the magic technology that convinces IT managers to say yes to working from outside the office.

When you’re sitting in a hotel room, at a customer’s office or in your own study, and you establish a VPN connection, your PC will generally stay logged on without any problems. However, when you’re relying on a Wi-Fi hotspot or mobile broadband dongle to establish a VPN connection while on the move, you may suffer frequent dropped connections and a cumbersome process for re-authenticating and re-establishing the VPN connection each time.

The VPN Reconnect feature allows Windows 7 to automatically re-establish active VPN connections after Internet connectivity is interrupted. As soon as Windows 7 reconnects to the internet, it will also reconnect to the VPN.

Inevitably, the VPN will still be ­unavailable as long as the internet connection is down, and the process of reconnecting will take a few seconds after access becomes available again, but VPN Reconnect at least ensures that your ­network resources will pop back up as soon as possible, without you ­having to fiddle around with anything.

We promised you some technical details, so: VPN Reconnect is basically an IPsec tunnel using the IKEv2 (Internet Key Exchange) protocol for key negotiation and for transmission of ESP (Encapsulating Security Payload) packets. ESP is part of the industry standard IPsec security architecture, which provides confidentiality, authentication of data origin and connectionless integrity.

In plain English: the system knows where data is coming from and that it hasn’t been seen or modified on the way.

Why all this fuss just to maintain your connection? Well, it’s a trickier job than it might seem. For example, when viewing streaming video over a VPN connection while you’re on a train, you would typically lose all buffered data and have to start the video again every time the connection went down.

The features of the IKEv2 IPSec tunnel and ESP help to ensure a persistent connection, despite wrinkles like the IP address changing during the reconnection (as it well might when you’re connecting to someone else’s server, such as a Wi-Fi hotspot or mobile phone network), and allow the streaming video to resume from the point it was at when VPN connectivity was lost.

Source pcadvisor