Open VPN is more secure than the ancient Point-to-Point Tunneling Protocol (PPTP) and the Cisco Layer 2 Tunneling Protocol (L2TP) which is aged, too.
Astrill VPN appeared to have some issues with the DNS leak test. Suspect someone. probably the federal government, has developed a technique, to track or hack VPN activity.
After installing the Astrill VPN, I noticed both Yahoo and Google DNS servers were aware of the VPN. After attempting to block these servers in my firewall, I used http://www.whatsmyip.org/whois-dns-lookup/, which identified a CIDR address for the Yahoo network.
Unless you have an WAN networking background, you are unlikely to know what a CIDR address is. The CIDR address allowed me to block the entire offending networks from the VPN.
Of interest, this solution worked on both Windows Mint 17.1 and Windows 7 laptops.
BTW the 18.104.22.168/8 belongs to PSI Net, an old Darpanet contractor that has worked with NSA for many years. PSI net developed Dropbox,a a program that Ed Snowden suggests Internet users should avoid.
While writing this article another VPN interloper popped up, Google.com with the 174.125.00/16 network address. The first CIDR address (22.214.171.124/14) keeps Yahoo.com out of my VPN.
Think of the VPN network as all of the connections between your PC and VPN server. Blocking Yahoo and Google addresses in the VPN connection will not prevent you from getting to the Yahoo web site or from receiving Gmail.
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