Is it possible to detect whether or not a visiting computer is using OpenVPN to tunnel from a remote location? I know that through packet inspection I can determine an OpenVPN connection between the end-user computer and the OpenVPN server regardless of port, but what about detection of the end-user computer using OpenVPN, after the traffic has been NAT'd and it hits my remote server? Are their any giveaways in the packets (even the smallest crumb)?
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The same question was asked just an hour after I asked @ http://security.stackexchange.com/questions/71774/how-can-i-detect-a-vpn-connection-even-just-in-some-cases-to-get-the-real-loca – greasemonkey Nov 04 '14 at 02:04
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@greasemonkey - That question was asked a week ago. Why are you asking? One major factor in using VPNs is to disguise the origin location, both from the ultimate destination and anybody else snooping on the line - if you could detect the true location it would defeat the purpose. Further, just knowing that something is running a VPN service isn't necessarily enough to tell you that a given connection is using the service, vs coming from the computer running the VPN itself. – Clockwork-Muse Nov 04 '14 at 03:16