Internet fraud
A proverb says: "Forewarned - means armed." Not listening to her is stupid. Nowadays, the Internet is playing an increasingly important role in people's lives, and is of undoubted benefit.…

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Present day viruses
There are a huge number of computer viruses in the world. To establish their exact number (along with all modifications and upgrades) no one is taken. Instead, it is customary…

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How to choose a contractor for promotion on the Internet?
We are engaged in online marketing. Every day, our sales team helps customers determine the contractor and how to evaluate his work. Often we are asked to help navigate a…

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pptpclient can act as either

PPTP VPN

This protocol allows you to implement a secure point-to-point connection by creating a tunnel in an insecure network.

The work of PPTP is to implement PPP frames in IP packets for transferring them to any IP network, including the Internet. In addition, this technology can be used to create a tunnel between local networks.

A TCP connection is used to service the created PPTP tunnel.

Brief specification
The protocol specification was published in 1999 in RFC2637, but the IETF community has not ratified it.
Less secure than IPSec, PPTP establishes a PPP session using the GRE protocol. The 1723 TCP port is used to control and initiate the GRE connection. Redirecting PPTP to the firewall is difficult because the protocol requires two sessions to be established simultaneously. Continue reading

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Enterprise VPN in plain language
Today, many who are interested in computer technology and communications have heard about such a popular technology as VPN. However, most of the articles describe subtle nuances of technology that…

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