The SSL VPN technology can be utilized in three ways:
1. Clientless SSL VPN
A remote client needs only an SSL−enabled web browser to access http or https enabled web servers on the corporate LAN. Access is also available to browse for Windows files with the Common Internet File System(CIFS). A good example of http access is the Outlook Web Access (OWA) client.
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2. Thin−Client SSL VPN (Port Forwarding)
A remote client must download a small, Java−based applet for secure access of TCP applications that use static port numbers. UDP is not supported. Examples include access to POP3, SMTP, IMAP, SSH, and Telnet. The user needs local administrative privileges because changes are made to files on the local machine.This method of SSL VPN does
not work with applications that use dynamic port assignments, for example,several FTP applications.
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3. SSL VPN Client (SVC−Tunnel Mode)
The SSL VPN Client
downloads a small client to the remote workstation and allows full, secure access to the resources on the internal corporate network. The SVC can be downloaded permanently to the remote station,or it can be removed after the secure session ends.
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