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The oldest approach to VPNs is probably SOCKS 5, which was first developed by Aventail. SOCKS 5 is a bit different from L2TP and IPsec: It follows a proxy server model and works at the TCP socket level. To use SOCKS 5, systems must be outfitted with SOCKS 5 client software and the your organization needs to be running a SOCKS 5 server. First, a client request for services is intercepted by the SOCKS 5 client. The request is sent to the SOCKS 5 server, which checks the request against a security database. If the request is granted, the SOCKS 5 server establishes an authenticated session with the client and acts as a proxy for the client, performing the requested operations. The upside to SOCKS 5 is that it lets network managers apply specific controls on proxied traffic. Because it works at the TCP level, SOCKS 5 lets you specify which applications can cross the firewall into the Internet, and which are restricted.
The first major component that needs to be added to VPN is a directory server, The result: The corporate net can be easily extended across the public infrastructure, blurring the traditional lines between public and private in the process.
One of the traits of a system administrator is to provide to the employees tools that can help them in their jobs. Some tools can be useful and may be costly. Some are available and can be tweaked a bit An open VPN is one of them. Nowadays, communications have become the blood flow of corporations and organizations around the world. In order to survive, they need to communicate, adequately, with their internal clients (employees) and external clients (costumers). The question, though, if I use an open VPN then how do open VPN proxys work?
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Virtual Private Networks References -- very good
VPN - Virtual Private Network - Downloadable Info
Books on Virtual Private Networks
Chapter from O'Reilly book
Web ProForum Tutorial- VPNs
Virtual Private Networks
Dynamic Virtual Private Networks
Virtual Private Networks (VPNs)
Nortel Networks Products & Services - Contivity VPN Switches
Each Contivity VPN Switch is a single hardware device which provides
routing, firewall, bandwidth management, encryption, authentication, and data integrity for secure tunneling across managed
IP networks and the Internet. With Contivity VPN Switches, you can connect remote users, branch offices, suppliers, and
customers with the cost and performance advantages of shared IP networks and the security and control you would expect from
This integrated product family includes the Contivity 100 for small office/home offices requiring a limited number of users; Contivity 600 for branch offices requiring up to 30 simultaneous users; Contivity 1510, 1520 and 1530 for office centers, campuses, or branch offices requiring up to 100 simultaneous users; Contivity 2600 for locations requiring up to 1000 users; and Contivity 4500 for up to 5000 users.
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Last modified: March, 12, 2019