How does QuickVPN really work, technically?

Discussion in 'Cisco Small Business Routers and VPN Solutions' started by ifican, Sep 8, 2006.

  1. ifican

    ifican Network Guru Member

    Ok this is going to be a tough one and i hope someone has some documentation or knowledge as I have yet to find any. But i want to know precisely how QucikVPN works so i can figure out the issue i am having (believe it to be routing).

    What i am getting at with how it works is this, most vpn clients, infact all that i have ever used, recieve an IP from the server side via a virtual adapter. It is this ip space that the remote machine uses to connect to the server side. However with QuickVPN there is no ip issued from the server side and because of it i am having a heck of a time trying to figure out / understand how data knows where to go ie, tunnel or wan and how it knows how to get back. It feels like the clients on the remote machine is intercepting the traffic inspecting it and sending it across, but it also feels layer2 and there are no route statements on my machine for the remote network and would explain the issue i am having. Any insight is always appreciated however i am really looking for a high level answer. Doesnt have to be down to the code itself but if someone could explain all thats going on in the backround that would help tremendously.

  2. DocLarge

    DocLarge Super Moderator Staff Member Member

    As best as I can tell, it's just symmetric encryption and MD5 algorithm happening in the background. Quickvpn uses the same username/password on both sides and it all works once the hashing algorithm from both sides match up; once they make this very trusting authentication from there, quickvpn just starts sending information.

    This is a very "basic" description. For anything more in-depth, try Pm'ing eric_stewart.

  3. ifican

    ifican Network Guru Member

    I wondered when you were going to get to this one. That definetly helps, when i wrote this one i was trying to figure out why it wasnt working. It was to the point that i was extremely frustrated because it should have worked and it didnt and i didnt understand enough of what was going on to try to fix it. Needless to say, it was the codes fault. The firmware upgrade i just did fixed it all and now it works perfectly, now, if i could only get my others issues resolved it would be a perfect world. Thanks for the reply..... when i get a few extra minutes i just need to find a whitepaper on how ssl vpns work, preliminary searches didnt turn up anything.
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