Cost: There's a 3 day free trial you can grab but you'll still need to enter your credit card. Otherwise, you can pay for VyprVPN every month for $9.95/month (or buy a year at once to bring that down to $5/month). Additional, there's a Premium plan for $12.95/month (or $6.67/month when billed annually) that lets you use your account on up to five devices at once, plus it supports Chameleon.
Password Authentication Protocol (PAP) is a clear-text authentication scheme. The NAS requests the user name and password, and PAP returns them in clear text (unencrypted). Obviously, this authentication scheme is not secure because a malicious user could capture the user's name and password and use it to get subsequent access to the NAS and all of the resources provided by the NAS. PAP provides no protection against replay attacks or remote client impersonation once the user's password is compromised.
Using a VPN will prevent most kinds of DNS attacks that would redirect you to a phishing page, but a regular old page made to look like a legit one in order to trick you into entering your data can still work. Some VPNs, and most browsers, are pretty good about blocking phishing pages, but this attack still claims too many victims to be ignored. Use common sense and be sure to verify that websites are what they say they are by looking carefully at the URL and always visiting HTTPS sites.
With the single-adapter model, also known as the NBMA model, the network for the frame relay service provider (also known as the frame relay cloud) is treated as an IP network and the endpoints on the cloud are assigned IP addresses from a designated IP network ID. To ensure that OSPF traffic is received by all of the appropriate endpoints on the cloud, the frame relay interface must be configured to send unicast OSPF announcements to all of the appropriate endpoints. For the server running Routing and Remote Access, this is done by designating the interface as an NBMA network and adding OSPF neighbors.
TunnelBear is designed for a very specific group of people: people who want a VPN service but don’t want to mess around with configuration or become IT experts to make their connections more secure. And it caters brilliantly for that market, with a very straightforward interface and jargon-free writing. In truth, all of the VPN services these days do this but TunnelBear tries very hard to stand out. It’s not for power users - there isn’t much you can change - but with up to five simultaneous connections, servers across 20 countries and decent performance on US and Canadian websites.  Longer connections can be slower, though: it’s when the relatively small number of server locations makes itself obvious. There’s a free version that limits you to 500MB of monthly traffic, and if you pay annually the price of the full version drops from $9.99 to $4.99 per month.
Think about it this way: If your car pulls out of your driveway, someone can follow you and see where you are going, how long you are at your destination, and when you are coming back. They might even be able to peek inside your car and learn more about you. With a VPN service, you are essentially driving into a closed parking garage, switching to a different car, and driving out, so that no one who was originally following you knows where you went.