ITIS 1210 Introduction to Web-Based Information Systems Chapter 42 How Intranets Work
Introduction § An intranet is a private corporate network § Used for § Email § Group meetings/videoconferencing § Scheduling § Access to corporate databases & documents § Sales of goods and services
Introduction § Use same technologies as rest of Internet § TCP/IP § WWW § FTP § Difference is that these resources are not available to the public at large § Usually protected behind a firewall § HW/SW that prohibits unauthorized access
Introduction § Users on the inside can access the Internet § However, outside users are prohibited
Using an Intranet Within a Company § Firewall controls access § Employees inside firewall § Rest of world outside § Some outsiders permitted entry § Key component is a email server § Works like regular Internet email § Typically routes within organization § However, can access Internet through firewall
Using an Intranet Within a Company § Corporate database may contain § Data § Financial information § Research § Documents § Software documentation § Project information § Plans § Corporate vision § Sales strategies
Using an Intranet Within a Company § Corporate databases may provide access § HTML documents § Search tools § Groupware enables collaboration § Online meetings § Scheduling § Work on documents § Any kind of cooperative work
Using an Intranet Within a Company § Videoconferencing § Enables meetings when participants are physically separated § Within Intranet high speed is more possible § Corporation controls § More difficult working within constraints of regular Internet
Using an Intranet Within a Company § Security can be built into the firewall § Makes it easier to do business with subcontractors and other businesses § Secure Web link to § Submit bids § Send invoices § Receive electronic payments
Using an Intranet Within a Company § Customers can buy goods and services § Browse through company catalogs § Using company’s public Web site § Order goods § Submit payments § Transactions travel through the firewall § In both directions § Encryption provides security
How VPNs Work § A Virtual Private Network (VPN) lets groups create their own private network § Without the actual expense § Corporations can use one so their employees can connect to the company intranet wherever they are in the world § In example, a remote PC user communicates to an employee back at headquarters
How VPNs Work § The remote PC runs VPN client software § The message is encrypted using the recipient’s public key § (Book is wrong) § Encrypted message packets encapsulated inside a normal IP packet § The destination address is that of a PC or router at the other end of a tunnel
How VPNs Work § True destination address cannot be read by snoopers, only tunnel address § Packets travel across the Internet as usual § Routers read tunnel address and move the packets closer to their destination § At destination end of tunnel the IP packet is stripped off
How VPNs Work § The inner packet is decrypted § This reveals the true destination address § The packets are delivered to the recipient
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