OpenWeb is simple and fast protocol, suitable for web surfing and streaming videos websites (such as YouTube, Vimeo, Vevo, and many others). Works with all major browsers (such as Firefox, Google Chrome, Internet Explorer, Opera, and Safari), and works with Windows, Mac OS X, and Linux operating systems. This protocol usually offers faster surfing speeds than other protocols, and has much more features. OpenWeb encrypts your data both ways using proprietary encryption algorithms such as BlowFish and AES. If you are familiar with proxies, OpenWeb protocol works in similar way. The advantage of OpenWeb protocol is that there is no connection or disconnection from and to VPN servers, you simply switch to any server instantly and surf immediately, it's that fast. Another great advantage of OpenWeb protocol is that, it has lots of useful features, such us browser selection, site filter, ads blocker, and media recorder.
OpenVPN protocol is most secure and fast, suitable for tunnelling all applications on your computer, and also works with P2P applications (BitTorrent, such as uTorrent, BitComet and many others clients). OpenVPN protocol works on Windows, Mac OS X, Linux, and Routers with DD-WRT and Tomato firmware, and can also work on iPhone/iPad and Android devices (Now it's possible to load OVPN file onto OpenVPN iOS app). OpenVPN protocol uses industry standard SSL encryption (AES and BlowFish). The main advantage of OpenVPN protocol is that it has advanced split routing/split tunnelling features and can tunnel all applications on your computer. Also it has lots of other useful features, such as site filter, application filter, port forwarding, web cache, easy router setup wizard, and VPN Sharing.
StealthVPN protocol is most secure and fast, suitable for tunnelling all applications on your computer, and also works with P2P applications (BitTorrent, such as uTorrent, BitComet and many others clients). StealthVPN protocol works on Windows, Mac OS X, and Linux. StealthVPN is an additional layer of encryption on top of OpenVPN, thus it is more secure and also it is harder to block. StealthVPN is our customized version of OpenVPN protocol. Which works undetected as a protocol, and is our solution for China (and other countries which block standard OpenVPN protocol). The main advantage of StealthVPN protocol is that it still works even if standard VPN protocols get blocked. Giving you extra stealth and security. Also you still get to enjoy all extra features and functionality as you did with OpenVPN protocol, such as site filter, application filter, port forwarding, web cache, and VPN Sharing.
In your Astrill desktop client, under Settings > Privacy, enable "Internet Kill Switch", "Fix WebRTC IP leak" & "Disable IPv6".
Yes, only if you're using the OpenVPN or StealthVPN protocol.