• MS Proxy Server as Web Cache Server
  • Hierarchical Caching Example
  • Distributed Caching Example
  • WinSock, SOCKS, Web Proxy
  • Examples of Capacity Planning
    		•

    Proxy Server as Firewall Server




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    Proxy Server as Firewall Server

    • Packet Filtering – examines all TCP/IP based attempts in & out of the network.
      • Static and Dynamic.
    • Logs all connection attempts & alerts in real-time of the suspicious activities.
    • Reverse Proxy - Places the web server behind Proxy Server to publish to the Web.
      • “Impersonates" a Web server to the outside.
      • Reverse Hosting & Server Proxying.

    Reverse Proxy Example

    • Proxy
    • Web Server
    • Client
    • Mkt Dept
    • LAN
    • Secure Network
    • www.company.com
    • www.company.com
    • www.company.com

    MS Proxy Server as Web Cache Server

    • Web Caching – process of storing Web content locally to reduce network traffic.
      • Active and Passive.
    • Allow internal clients to have full Web access behind the firewall without compromising security.
    • Hierarchical Caching.
    • Distributed Caching.

    Cache Example

    • Internet
    • 1st client
    • 2nd client
    • Connection
    • to Internet
    • Proxy
    • Content
    • Cached
    • 50% Traffic
    • Saving
    • Cache Hit!

    Hierarchical Caching Example

    • Internet
    • Proxy
    • Proxy
    • Proxy
    • New York
    • Los Angeles
    • Boston
    • Client
    • Client
    • Client
    • Client

    Distributed Caching Example

    • Internet
    • Proxy 1
    • Proxy 3
    • Proxy 4
    • Proxy 2
    • Client
    • Client
    • Client
    • Client
    • Client
    • Client

    WinSock, SOCKS, Web Proxy

    • Protocols allow the application clients to communicate to application servers.
    • Performs three functions:
      • Intercepts connection requests.
      • Sets up proxy circuit.
      • Relays application data.

    WinSock & SOCKS Proxy

    • WinSock Proxy.
      • For Window application.
      • Creating virtual connection between Internal and Internet application.
      • Acts as gateway protocol for IPX/SPX.
    • SOCKS Proxy.
      • Allows Unix, Mac and Window client application that support SOCKS protocol specification.
      • Handles all TCP/IP traffic through the proxy server.
      • Cannot Handle UDP based protocols.

    Web Proxy

    • Web Proxy
      • Supports any CERN web browser.
      • Supports HTTP, FTP, SSL and Gopher protocol.
      • Enables its caching capabilities.

    System Requirements

    • WinNT Server 4.0 with service pack 3 or later.
    • IIS – Internet Information Server.
    • Network interface card.
    • CPU and disk space:
      • Intel based: 486/33MHz or higher & 125MB.
      • RISC based: RISC processor compatible with WinNT 4.0 & 160MB.
    • 16MB of RAM.

    Examples of Capacity Planning

    Examples of Capacity Planning

    • Small Office Network.
    • Medium-Size Office Network with a Branch Office.
    • Large Enterprise Network.

    Example of Small Office Network

    • Modem or ISDN line
    • ISP
    • Proxy Server
    • (Win NT RAS client)
    • Web Server
    • Mail Server
    • Internet
    • Client
    • Client
    • Client
    • Content
    • Cached
    • LAN

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