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Ethereal/WireShark Tutorial

Learn how to use Wireshark, the network protocol analyzer formerly known as Ethereal, to capture and analyze network packets with detailed data display. Explore filtering, sorting, and capturing packets for efficient protocol analysis.

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Ethereal/WireShark Tutorial

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  1. Ethereal/WireShark Tutorial Yen-Cheng Chen IM, NCNU

  2. WireShark • The Ethereal network protocol analyzer has changed its name to Wireshark. • http://www.wireshark.org/ • Download: • http://www.wireshark.org/download.html • Wireshark User's Guide • http://www.wireshark.org/docs/wsug_html/

  3. Introduction • A network protocol analyzer will try to capture network packets and tries to display that packet data as detailed as possible. • What will be captured • All packets that an interface can ”hear” • At your PC connected to a switch • Unicast (to and from the interface only) • Multicast, RIP, IGMP,… • Broadcast, e,g ARP,

  4.  menu  main toolbar  filter toolbar  packet list pane  packet details pane ipconfig /renew  packet bytes pane  status bar

  5. packet list pane

  6. Sort by source

  7. packet details pane

  8. packet bytes pane

  9. Filter

  10. Filter Expression ip.src == 10.32.11.220 && ip.dst == 163.22.32.101 ip.src eq 10.32.11.220 and ip.dst eq 163.22.32.101 ip.src == 10.32.11.220 || ip.src == 163.22.32.101 http && ( ip.src == 10.32.11.220 || ip.src == 163.22.32.101) !(ip.dst == 10.32.11.220)

  11. (ip.dst == 10.32.11.220) && (ip.src == 163.22.32.101)

  12. Follow TCP Stream

  13. Export

  14. No. Time Source Destination Protocol Length Info 950 10.693436 10.32.11.220 163.22.32.101 HTTP 613 GET /rnd/ HTTP/1.1 Frame 950: 613 bytes on wire (4904 bits), 613 bytes captured (4904 bits) Ethernet II, Src: Metallig_43:fd:08 (00:50:bf:43:fd:08), Dst: Cisco_74:e4:00 (00:1a:30:74:e4:00) Internet Protocol Version 4, Src: 10.32.11.220 (10.32.11.220), Dst: 163.22.32.101 (163.22.32.101) Transmission Control Protocol, Src Port: rdrmshc (1075), Dst Port: http (80), Seq: 559, Ack: 813, Len: 559 Source port: rdrmshc (1075) Destination port : (80) [Stream index:21] Sequence number : 559 (relative sequence number) [Next sequence number : 1118 (relative sequence number)] Acknowledgement number : 813 (relative ack number) Header length : 20 bytes Flags : 0x18 (PSH , ACK) window size value : 64723 [Calculated window size : 64723] [window size scaling factor : -2 (no window scaling used)] Checksum : 0x5306 [validation disabled] [SEQ/ACK analysis] Hypertext Transfer Protocol

  15. Capture Options

  16. Assignments • 5 layers • Ethernet II frame • 802.3 frame • Broadcast frame • Deadline: ?

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