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Internet Overview

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Transcript

  • 1. Introduction to the Internet May 18, 2000 Sandy Bacik, CISSP Senior Security Consultant Breakwater Security Associates email: san04@att.net
  • 2. Agenda
    • History
    • Definitions
    • IP addresses and classes
    • Protocols
    • Tracking information
  • 3. History
    • Sometimes call “the Net”
    • U.S. Defense Department - ARPAnet
    • A system of linked computer networks, international in scope, that facilitates data communication services
  • 4. Definitions Internet backbone This superfast network spanning the world from one major metropolitan area to another is provided by a handful of national Internet service providers (ISPs). Local ISPs connect to this backbone through routers so that data can be carried though the backbone to its destination.
  • 5. Definitions Internet Network Information Center A repository of information about the Internet. It is divided into two parts: 1) directory services, run by AT&T in New Jersey, and 2) registration services, run by Network Solutions in Virginia.
  • 6. Definitions IP (Internet Protocol) address
    • A numeric address that is given to servers and users connected to the Internet.
    • For servers it is translated into a domain name by a Domain Name Server aka the DNS.
  • 7. Definitions TCP/IP
    • Transmission Control Protocol/Internet Protocol
    • A suite of protocols
    • A 2 layer program
  • 8. Definitions Protocol An agreed upon formatting for transmitting data between two devices IP Internet Protocol. IP specifies the format of packets, also called datagrams, and the addressing scheme
  • 9. Definitions TCP Transmission control protocol enables 2 hosts to establish a connection and exchange streams of data. UDP User Datagram Protocol, a connectionless protocol that, like TCP, runs on top of IP networks.
  • 10. IP Addresses 192 . 168 . 124 . 123 An identifier for a computer or device on a TCP/IP network.
  • 11. Definitions DNS Domain Name Service WINS Windows Internet Naming Service DHCP Dynamic Host Configuration Protocol
  • 12. Port Number
    • The port numbers are divided into three ranges:
      • the Well Known Ports
      • the Registered Ports
      • the Dynamic and/or Private Ports
    • ftp://ftp.isi.edu/in-notes/iana/assignments/port-numbers
  • 13. Protocols with Well-Known Ports
    • telnet
    • news
    • echo
    • ping
    • chat
    • irc
    • http
    • smtp
    • pop3
    • imap
    • netbios
    • ftp
    • print
  • 14. Protocols with Registered Ports
    • Network blackjack
    • Tripwire
    • HP WebAdmin
    • Lotus Notes
    • screen cast
    • timbuktu
    • MS SQL
    • IBM wireless LAN
    • Shiva
    • laplink
    • prodigy internet
  • 15. TCP Session Setup Session setup using 3-way handshake
  • 16. TCP Session Termination Aborting a connection (reset)
  • 17. Reference Model
  • 18. TCP/IP related to OSI stack
  • 19. IPX/SPX related to OSI stack
  • 20. NetBEUI related to OSI stack
  • 21. UDP Packet Header information
    • Source Port
    • Destination Port
    • Datagram Length
    • Checksum
  • 22. TCP Packet Header information
    • Source Port
    • Destination Port
    • Sequence Number
    • Acknowledgement Number
    • Header Length
    • Flags
    • Window Advertisement
    • Checksum
    • Urgent Pointer
  • 23. Ping
    • Information gathering
    • Selected hosts
    • See if hosts are alive and responding on a network
  • 24. Ping Sample
  • 25. Port Scanning
    • Information gathering
    • Can be custom built or 3rd party software
    • Selected hosts
    • Ports are tested
  • 26. Traceroute
    • Utility to record the route to a specific computer
    • Information gathering
    • Usually 3rd party software
    • UDP protocol using ports 33000 > < 35000
  • 27. Traceroute Sample
  • 28. Thank you