Interesting features of UI design in different countries
When you create an interface design for applications / sites operating in different countries, you should take into account the peculiarities of national cultures and traditions of the corresponding target…

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Security in Firefox Browser
When working on the Internet, the highest priority should be to ensure the safety of users. Indeed, in the "global web" there is a huge number of fraudulent sites and…

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Internet Marketing Cost Effectiveness
What are the main steps in the online sale process? Advertising tools attract potential customers to the site. Tools can be different: seo, contextual advertising, display advertising, advertising on social…

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protocols that use checksum calculation

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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