2006-06-19 16:08:28 · 6 answers · asked by rumaldo 1 in Computers & Internet ➔ Computer Networking
VPNs, or virtual private networks work by "tunnelling" data of one protocol type on top of another.
A virtual conduit (usually a TCP/IP connection) is made between the machine connecting to the VPN and the VPN server, or gateway.
This keeps data confidential, because before any data is transmitted to the remove server, it is encrypted. Various forms of VPN encryption exists, but the most popular protocol is likely IPSEC. IPSEC, which standards for "Internet Protocol Secured" is a standards based key encryption system.
The data is checksummed and any changes to the data are rejected by the gateway and must be re-sent to the client. Special techniques are used to detect listeners in the middle of the connection (so called man-in-the-middle attacks) and reject any packets that might have been compromised in transit.
Lastly, most VPN solutions provide a means for load balancing multiple VPN gateway servers so that remote clients will always have a server to connect to, even if one breaks. This ensures that remote networks or workstations can connect with high availability. Some VPN gateways even support connection failover to another gateway without terminating the original connection.
SSH, the 'secure shell' program can implement a form of tunnelling, encrypted by the SSH protocol. Many computer savvy people use SSH very often to easily proxy web connections across a secure connection, among other things.
Some SSH clients (such as PuTTY) can create a "dynamic" tunnel that acts as a SOCKS proxy server. Using the dynamic tunnel you can encrypt traffic from any program that supports socks, making tunnelling your data very easy.
2006-06-19 16:19:10 · answer #1 · answered by Swanhart 2 · 0⤊ 0⤋
Confidentiality Integrity Availability
2016-10-06 12:17:49 · answer #2 · answered by ? 4 · 0⤊ 0⤋
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2016-11-15 00:16:46 · answer #3 · answered by ? 4 · 0⤊ 0⤋
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2014-04-20 06:24:38 · answer #4 · answered by Anonymous · 0⤊ 0⤋
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2016-08-08 00:50:42 · answer #5 · answered by Anonymous · 0⤊ 0⤋
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2016-08-23 00:10:07 · answer #6 · answered by Anonymous · 0⤊ 0⤋