Draytek Vigor3910 Series, Руководство пользователя

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Vigor3910 Series User’s Guide 198
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SSL VPN (Secure Sockets Layer virtual private network) is a form of VPN that encrypts traffic
using SSL, which is the same technology used on secured websites. Because of SSL’s
prominence as an encryption protocol on the Internet, most networks have few restrictions on
SSL traffic, and as a result SSL VPN is more likely to work when other VPN technologies
experience difficulties due to obstacles such as firewalls and Network Address Translation
(NAT).
In short,

It is not necessary for users to preinstall VPN client software for executing SSL VPN
connection.

There are less restrictions for the data encrypted through SSL VPN in comparing with
traditional VPN.