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March 30

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March 30

  1. 1. CS335 Networking & Network Administration Introductions History of Networks Simple Computer Networks
  2. 2. Timothy Welch <ul><li>Network manager – La Grande School District </li></ul><ul><li>Bought first computer in 1986 – Atari 1040st </li></ul><ul><li>Macintoshes – 1990 </li></ul><ul><li>Big Sky Telegraph </li></ul><ul><li>300 baud modem </li></ul><ul><li>Text file transfers </li></ul><ul><li>1995 introduced to www/mosaic/netscape </li></ul>
  3. 3. Timothy Welch – bio (cont.) <ul><li>NSF grant at EOU </li></ul><ul><li>Web development </li></ul><ul><li>Private networking and web serving </li></ul><ul><li>Database driven web development </li></ul><ul><li>1998 LGSD network installed </li></ul><ul><li>Development of LGSD network and data development </li></ul><ul><li>Novell, Windows, Macintosh, Linux, Cisco </li></ul>
  4. 4. Enough about me <ul><li>What about you as CS students? </li></ul><ul><li>Course expectations? </li></ul><ul><li>Where do we begin? </li></ul>
  5. 5. History of computer networks <ul><li>Resource sharing </li></ul><ul><li>ARPAnet (Advanced Research Project Agency) 1960’s </li></ul><ul><li>Packet switching technology </li></ul><ul><li>By the 70’s internetworking emerged </li></ul><ul><li>Internet research 80’s & 90’s </li></ul>
  6. 6. Growth of the Internet
  7. 7. Ping <ul><li>A utility to determine whether a specific IP address is accessible. It works by sending a packet to the specified address and waiting for a reply. PING is used primarily to troubleshoot Internet connections . There are many freeware and shareware Ping utilities available for personal computers . It is often believed that &quot;Ping&quot; is an abbreviation for P acket In ternet G roper, but Ping's author has stated that the names comes from the sound that a sonar makes. </li></ul>
  8. 8. Probing the internet <ul><li>Ping </li></ul><ul><li>Is a host reachable? </li></ul><ul><li>Response time consistent </li></ul><ul><li>IP Address or domain name </li></ul>
  9. 9. Ping commands
  10. 10. Using ping <ul><li>We had a network segment that was acting very slow. Used ping to verify packet loss. Helped us find a problem on the router. </li></ul><ul><li>Find hosts </li></ul><ul><li>Test trip length </li></ul><ul><li>Test for connectivity </li></ul>
  11. 11. Traceroute <ul><li>trās´rowt) (n.) A utility that traces a packet from your computer to an Internet host , showing how many hops the packet requires to reach the host and how long each hop takes. If you're visiting a Web site and pages are appearing slowly, you can use traceroute to figure out where the longest delays are occurring. The original traceroute is a UNIX utility , but nearly all platforms have something similar. Windows includes a traceroute utility called tracert . In Windows , you can run tracert by selecting Start->Run… , and then entering tracert followed by the domain name of the host. </li></ul><ul><li>Traceroute utilities work by sending packets with low time-to-live (TTL) fields. The TTL value specifies how many hops the packet is allowed before it is returned. When a packet can't reach its destination because the TTL value is too low, the last host returns the packet and identifies itself. By sending a series of packets and incrementing the TTL value with each successive packet, traceroute finds out who all the intermediary hosts are. </li></ul>
  12. 12. Traceroute <ul><li>Finding network hops </li></ul><ul><li>http://www.net.cmu.edu/cgi-bin/netops.cgi </li></ul><ul><li>EOU network doesn’t allow ping (ICMP Echo Request) traffic outside the network. </li></ul><ul><li>ICMP (internet control message protocol) </li></ul>
  13. 13. Windows tracert
  14. 14. Traceroute Result from <ul><li>http://www.net.cmu.edu/cgi-bin/netops.cgi </li></ul><ul><li>1 POD-C-CYH-VL4.GW.CMU.NET (128.2.4.48) 0.474 ms 0.378 ms 0.349 ms </li></ul><ul><li>2 CORE0-POD-C-CYH.GW.CMU.NET (128.2.0.186) 0.490 ms 0.477 ms 0.430 ms </li></ul><ul><li>3 HYPER-VL502.GW.CMU.NET (128.2.33.233) 0.788 ms 0.690 ms 0.628 ms </li></ul><ul><li>4 bar-cmu-ge-4-0-0-1.3rox.net (192.88.115.185) 0.485 ms 0.401 ms 0.398 ms </li></ul><ul><li>5 beast-bar-pc1-1.3rox.net (192.88.115.77) 0.424 ms 0.240 ms 0.236 ms </li></ul><ul><li>6 abilene-psc.abilene.ucaid.edu (192.88.115.124) 10.077 ms 10.079 ms 9.988 ms </li></ul><ul><li>7 nycmng-washng.abilene.ucaid.edu (198.32.8.84) 14.237 ms 14.189 ms 14.243 ms </li></ul><ul><li>8 chinng-nycmng.abilene.ucaid.edu (198.32.8.82) 34.398 ms 34.370 ms 34.242 ms </li></ul><ul><li>9 iplsng-chinng.abilene.ucaid.edu (198.32.8.77) 314.268 ms 304.626 ms 335.171 ms </li></ul><ul><li>10 kscyng-iplsng.abilene.ucaid.edu (198.32.8.81) 62.792 ms 47.301 ms 62.392 ms </li></ul><ul><li>11 dnvrng-kscyng.abilene.ucaid.edu (198.32.8.13) 68.743 ms 70.168 ms 57.887 ms </li></ul><ul><li>12 snvang-dnvrng.abilene.ucaid.edu (198.32.8.1) 82.692 ms 82.668 ms 82.740 ms </li></ul><ul><li>13 pos-1-0.core0.eug.oregon-gigapop.net (198.32.163.17) 94.933 ms 94.930 ms 94.989 ms </li></ul><ul><li>14 nero.eug.oregon-gigapop.net (198.32.163.151) 95.110 ms 95.294 ms 95.186 ms </li></ul><ul><li>15 ptck-core2-gw.nero.net (207.98.64.2) 97.494 ms 97.318 ms 97.298 ms </li></ul><ul><li>16 eou-car1-gw.nero.net (207.98.64.22) 110.236 ms 110.092 ms 109.994 ms 17 * * * 18 * * * 19 * * * 20 * * * 21 * * * 22 * * * 23 * * * 24 * * * 25 * * * 26 * * * 27 * eou-gw.eou.EDU (140.211.3.5) 111.158 ms !X * 28 * * * 29 * * * Error! Timed out while processing: /usr/sbin/traceroute 140.211.60.20. </li></ul>
  15. 15. Traceroute <ul><li>1 POD-C-VL4.GW.CMU.NET (128.2.4.1) 0.288 ms 0.213 ms 0.177 ms </li></ul><ul><li>2 CORE0-POD-C-NH.GW.CMU.NET (128.2.0.194) 0.213 ms 0.188 ms 0.183 ms </li></ul><ul><li>3 POD-I-CYH-VL940.GW.CMU.NET (128.2.0.205) 0.218 ms 0.210 ms 0.206 ms </li></ul><ul><li>4 bar-cmu-ge-4-0-0-2.3rox.net (192.88.115.185) 0.331 ms 0.300 ms 0.288 ms </li></ul><ul><li>5 beast-bar-pc1-1.3rox.net (192.88.115.77) 0.252 ms 0.171 ms 0.197 ms </li></ul><ul><li>6 abilene-psc.abilene.ucaid.edu (192.88.115.124) 9.866 ms 9.844 ms 25.241 ms </li></ul><ul><li>7 nycmng-washng.abilene.ucaid.edu (198.32.8.84) 25.461 ms 14.078 ms 14.181 ms </li></ul><ul><li>8 chinng-nycmng.abilene.ucaid.edu (198.32.8.82) 44.750 ms 37.361 ms 34.231 ms </li></ul><ul><li>9 iplsng-chinng.abilene.ucaid.edu (198.32.8.77) 38.024 ms 38.007 ms 46.806 ms </li></ul><ul><li>10 kscyng-iplsng.abilene.ucaid.edu (198.32.8.81) 47.258 ms 47.162 ms 47.968 ms </li></ul><ul><li>11 dnvrng-kscyng.abilene.ucaid.edu (198.32.8.13) 57.907 ms 57.769 ms 68.569 ms </li></ul><ul><li>12 snvang-dnvrng.abilene.ucaid.edu (198.32.8.1) 82.581 ms 88.631 ms 82.781 ms </li></ul><ul><li>13 pos-1-0.core0.eug.oregon-gigapop.net (198.32.163.17) 94.925 ms 94.786 ms 94.713 ms </li></ul><ul><li>14 nero.eug.oregon-gigapop.net (198.32.163.151) 94.999 ms 94.931 ms 94.978 ms </li></ul><ul><li>15 ptck-core2-gw.nero.net (207.98.64.2) 97.186 ms 97.280 ms 97.254 ms </li></ul><ul><li>16 eou-car1-gw.nero.net (207.98.64.22) 110.047 ms 109.972 ms 110.053 ms </li></ul>
  16. 16. Lab Exercises <ul><li>Ping </li></ul><ul><li>Traceroute programs </li></ul><ul><li>http://network-tools.com/ </li></ul><ul><li>History of the Internet </li></ul><ul><ul><li>http://www.davesite.com/webstation/net-history.shtml </li></ul></ul><ul><ul><li>http://www.isoc.org/internet/history/brief.shtml </li></ul></ul>
  17. 17. Lets go to the lab <ul><li>Testing out ping </li></ul><ul><li>Traceroute </li></ul><ul><li>History of the internet </li></ul><ul><li>Homework – Read the 2 web pages that are on the previous slide. Write a one page summary on the history of the internet as you understand it from this brief overview. </li></ul><ul><li>Due Tuesday. </li></ul>

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