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CS 145A Implementation Issues

CS 145A Implementation Issues. Netlab.caltech.edu/course. Topics of this thread. How does the TCP/IP work? (roughly) (Very) Simple & basic tools on network engineering Design and implementation of protocols. Mail lists. CS145class.cs.caltech.edu CS145ta.cs.caltech.edu. Today.

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CS 145A Implementation Issues

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  1. CS 145AImplementation Issues Netlab.caltech.edu/course

  2. Topics of this thread • How does the TCP/IP work? (roughly) • (Very) Simple & basic tools on network engineering • Design and implementation of protocols

  3. Mail lists • CS145class.cs.caltech.edu • CS145ta.cs.caltech.edu

  4. Today • The topology of Internet • Naming • Packet transmission • Stream Connection

  5. What does the Internet look like? • Example: (/sbin/traceroute) C:\>tracert cwis.usc.edu Tracing route to cwis.usc.edu [128.125.253.146] 1 <1 ms Jorgensen-RSM-44.caltech.edu [131.215.44.253] 2 <1 ms Booth-border.ilan.caltech.edu [131.215.254.254] 3 <1 ms CalREN-Caltech.caltech.edu [192.41.208.49] 4 <1 ms JPL--CIT.POS.calren2.net [198.32.248.5] 5 1 ms UCLA--JPL.POS.calren2.net [198.32.248.1] 6 1 ms ISI--UCLA.POS.calren2.net [198.32.248.29] 7 2 ms USC--ISI.POS.calren2.net [198.32.248.25] 8 3 ms rtr43-c2-gw.usc.edu [128.125.251.66] 9 2 ms rtr-gw-1.usc.edu [128.125.254.1] 10 2 ms cwis.usc.edu [128.125.253.146]

  6. Topology of the Network

  7. Global Network (From Quest)

  8. Get your “IDs” on-line • Example: (/sbin/ifconfig) C:\>ipconfig –all Physical Address. . . . . . . . . : 00-10-A4-79-F0-32 IP Address. . . . . . . . . . . . : 131.215.44.214 Subnet Mask . . . . . . . . . . . : 255.255.255.0

  9. Use of the IDs

  10. The Journey of a packet (1)131.215.44.214

  11. The Journey of a packet (1)131.215.44.214

  12. The Journey of a packet (1)131.215.44.214

  13. The Journey of a packet (1)131.215.44.214

  14. The Journey of a packet (1)131.215.44.214

  15. The Journey of a packet (1)131.215.44.214->131.215.44.253

  16. The Journey of a packet (2)131.215.44.253

  17. The Journey of a packet (2)131.215.44.253

  18. The Journey of a packet (2)131.215.44.253

  19. The Journey of a packet (2) 131.215.44.253

  20. The Journey of a packet (2) 131.215.44.253

  21. The Journey of a packet (2) 131.215.44.253

  22. The Journey of a packet (2)131.215.44.253->131.215.254.254

  23. The Journey of a packet (n) 128.125.254.1->128.125.253.146

  24. The Journey of a packet (n) 128.125.253.146

  25. The Journey of a packet (n) 128.125.253.146

  26. The Journey of a packet (n) 128.125.253.146

  27. The Journey of a packet (n) 128.125.253.146

  28. The Journey of a packet (n) 128.125.253.146

  29. Overview

  30. Necessary Information (1) • Where shall I pass the packet, for a given destination IP address? – Routing Table • Exmaple: [weixl@orchestra:~]> route

  31. Necessary Information (2) • Where shall I pass the packet, for a given destination IP address? -- Arp • Exmaple: [weixl@orchestra:~]> arp -a 131.215.44.227 at 00:06:5B:DE:C5:72 on eth0 131.215.44.142 at 00:60:B0:7C:E8:02 on eth0 131.215.44.113 at 00:A0:C9:5A:26:6D on eth0 131.215.44.80 at 00:E0:81:02:7F:7B on eth0 131.215.44.254 at 00:00:0C:07:AC:01 on eth0 131.215.44.253 at 00:90:6D:E7:D4:00 on eth0 131.215.44.12 at 00:20:78:1B:13:2C on eth0 131.215.44.14 at 00:A0:C9:06:2F:2A on eth0

  32. More Information (Bonus) • Get your phone book (Domain Name Service). • Example: [weixl@orchestra:~]> ping login.cs.caltech.edu PING orchestra.cs.caltech.edu (131.215.44.20) from 131.215.44.20 : 56(84) bytes of data. [weixl@orchestra:~]> freebsd-login.cs.caltech.edu (131.215.44.14) • API: gethostbyname()

  33. How does DNS work? www.mit.edu? 18.181.0.31

  34. Connection

  35. Streamless Connection

  36. Stream Connection

  37. Stream Connection • An Example: At: 1-626-395-3555 Call: DMV • Prerequisite: • You know the number of DMV (1-800-777-0133) • The service is now open at DMV. • There is a link between the two phones.

  38. Steps at your site: Establish the phone Dial the number Select the service Talk Hang up Steps at DMV: Establish the phone Establish the service on phone Accept your request Talk Hang Up Stream Connection • An Example: At: 1-626-395-3555 Call: DMV

  39. Stream Connection Steps at your site: • Establish the phone • Dial the number • Select the service • Talk to the representative • Hang up Steps at DMV: • Establish the phone • Establish the service on phone • Accept your request • Talk to you • Hang Up

  40. Steps at client’s site: Establish the socket Dial the number Select the service Talk to the representative Hang up Steps at server’s site: Establish the socket Establish the service Accept your request Talk to you Hang Up Stream Connection Steps at your site: • Establish the phone • Dial the number • Select the service • Talk to the representative • Hang up Steps at DMV: • Establish the phone • Establish the service on phone • Accept your request • Talk to you • Hang Up

  41. Steps at client’s site: Establish the socket Dial the number Select the service Talk to the representative Hang up Steps at server’s site: Establish the socket Bind socket to port & Listen Accept your request Talk to you Hang Up Stream Connection Steps at client’s site: • Establish the socket • Dial the number • Select the service • Talk to the representative • Hang up Steps at server’s site: • Establish the socket • Establish the service on phone • Accept your request • Talk to you • Hang Up

  42. Steps at client’s site: Establish the socket connect the address ( IP + port ) Talk to the representative Hang up Steps at server’s site: Establish the socket Bind socket to a port & Listen Accept your request Talk to you Hang Up Stream Connection Steps at client’s site: • Establish the socket • Dial the number • Select the service • Talk to the representative • Hang up Steps at server’s site: • Establish the socket • Bind socket to a port & Listen • Accept your request • Talk to you • Hang Up

  43. Steps at client’s site: Establish the socket connect the address ( IP + port ) Talk Hang up Steps at server’s site: Establish the socket Bind socket to a port & Listen Accept the request from client Talk to you Hang Up Stream Connection Steps at client’s site: • Establish the socket • connect the address ( IP + port ) • Talk to the representative • Hang up Steps at server’s site: • Establish the socket • Bind socket to a port & Listen • Accept your request • Talk to you • Hang Up

  44. Steps at client’s site: Establish the socket connect the address ( IP + port ) Send/Receive Data Hang up Steps at server’s site: Establish the socket Bind socket to a port & Listen Accept the request from client Send/Receive Data Hang Up Stream Connection Steps at client’s site: • Establish the socket • connect the address ( IP + port ) • Talk • Hang up Steps at server’s site: • Establish the socket • Bind socket to a port & Listen • Accept the request from client • Talk to you • Hang Up

  45. Steps at client’s site: Establish the socket connect the address ( IP + port ) Send/Receive Data Hang up Steps at server’s site: Establish the socket Bind socket to a port & Listen Accept the request from client Send/Receive Data Hang Up Stream Connection Steps at client’s site: • Establish the socket • connect the address ( IP + port ) • Send/Receive Data • Hang up Steps at server’s site: • Establish the socket • Bind socket to a port & Listen • Accept the request from client • Send/Receive Data • Hang Up

  46. Insight (from LinuxForum)

  47. CS 145A Lab 1Connection Netlab.caltech.edu/course

  48. How to establish a connection? • UDP Steps at client’s site: • Establish the socket • Send Data to the address ( IP + port ) • Close the socket Steps at server’s site: • Establish the socket • Bind socket to a port • Receive Data • Close the socket

  49. How to establish a connection? • TCP Steps at client’s site: • Establish the socket • connect the address ( IP + port ) • Send/Receive Data • Close the socket Steps at server’s site: • Establish the socket • Bind socket to a port & Listen • Accept the request from client and create a new socket for communication • Send/Receive Data on the new socket • Close the socket

  50. Tasks for Lab 1 • Be familiar with the basic commands that we talked about in class (see those examples in the lecture). • Write a program (“server”) that can act as a Server • Write a program (“udp client”) that can send UDP packets • Write a program (“tcp client”) that can send TCP packets

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