U of I CS 498 - IPv4 Overview (38 pages)

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IPv4 Overview



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IPv4 Overview

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Pages:
38
School:
University of Illinois
Course:
Cs 498 - Special Topics
Special Topics Documents

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IPv4 Overview Cyber Security Spring 2008 Outline Review Layered Network Architecture Network Layer protocols Transport Layer Protocols Application Layer Protocols Reading Material Many texts on IP networking Computer Networks Andrew Tannenbaum Data and Computer Communications William Stallings Internetworking with TCP IP Vol 1 Douglas Comer Plus all the originals from the Internet Engineering Task Force IETF http ietf org OSI Reference Model The layers 7 Application e g HTTP SMTP FTP 6 Presentation 5 Session 4 Transport e g TCP UDP 3 Network e g IP IPX 2 Data link e g Ethernet frames ATM cells 1 Physical e g Ethernet media ATM media Standard software engineering reasons for thinking about a layered design Layers Limit Need for Intelligence Intermediate devices only need to process the packet headers up to the level they understand Ether Hdr IP Hdr TCP Hdr HTTP Hdr Data Various network devices Hosts and servers Operate at Level 7 application Proxies Operate at level 7 Firewalls Operate between levels 2 and 7 From the outside world make changes at levels 2 in transparent mode or 3 in routing mode Routers Operate at Level 3 network Switches or Hubs Operate at level 2 data link Gateways Operate at level 2 Data Http Hdr TCP Hdr IP Hdr Ether Hdr IPv4 See Wikipedia for field details http en wikipedia org wiki IPv4 Version IHL Identification Time to live Type of service Total length DF MF Protocol Source address Destination Address 0 or more words of options Frag Offset Header checksum Ipv4 Addressing Each entity has at least one address Addresses divided into subnetwork Address and mask combination 192 168 1 0 24 or 10 0 0 0 8 Another way of saying 192 168 1 0192 168 1 255 or 10 0 0 0 10 255 255 255 Addresses in your network are directly connected Broadcasts should reach them No need to route packets to them Switches Original ethernet broadcast all packets Layer two means of passing packets Learn or config which MAC s live behind which ports Only pass traffic to the



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