Astrill Router Applet:VPN
VPN
Server
Select server in desired country. For better speed, select server closest to your location.
Starred servers allow you to use P2P application like Bitorrents.
Protocol
This feature will allow you to choose OpenVPN/Routerpro mode whether UDP or TCP. Select UDP protocol for best speed. If UDP does not work good (for example blocked/throttled by your ISP), try TCP mode. If your ISP blocks Openvpn protocol, select Routerpro VPN protocol. Routerpro VPN protocol is designed to work through restrictive firewall and increase the speed of VPN.
By default, it is set to Openvpn UDP. For reliability, you can choose Reliable (TCP) mode. If you are located in Country with high censorship like China and you have Routerpro in your account then you can choose Routerpro connection mode.
This is much secured than Openvpn because it uses dual layer of encryption. This is designed for countries with high censorship.
Port
Select connection port. For Openvpn you can use web ports 80 (http), 443 (https) and 53 (DNS). These ports should always be open when restricted firewall are enabled. With routerpro, VPN best is to use Auto Port. If you have a Private IP access, you can specify any port from 1-65535.
Openvpn UDP
Openvpn TCP
RouterPro UDP
RouterPro TCP
Encryption
BLOWFISH 128-BIT => Blowfish is fast but some see it as a weaker encryption.
STRONG (AES 128-BIT)=> This runs faster and is secured than Blowfish. It is widely and commonly used.
MILITARY (AES 256-BIT)=> This is the most secured and used for Top Secret Communication by the US government.
MSS
If your ISP throttles UDP from working. You can make UDP working by lowering the MSS value.
Enable Accelerator
This can speed up VPN access on some smart mobile devices like iOS and Android. It will not affect computer but actually slows down PC access and may not work properly.
Block internet if VPN Drops
If connection is dropped, then all traffic will be blocked until Openvpn reconnects