Intro to Wireshark What is it? What does it do? Why do I need it?

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Presentation transcript:

Intro to Wireshark What is it? What does it do? Why do I need it? Tech Talk Live 2018 Roy Hoover roy_hoover@iu13.org Intro to Wireshark What is it? What does it do? Why do I need it?

Wireshark- What is it Packet Capture Protocol Analyzer Network Analyzer

Wireshark- What does it do Analyze bits on the wire (or in the air) Break down packets into their components See what’s actually happening on your network

Wireshark- Why do I need it More detail on problems Tech support requested a capture Need to open a .PCAP file Want to understand network traffic flow in greater detail “Thorny” problems Don’t get lost in the weeds!

Wireshark What is it Windows, OS X, Linux, and UNIX Open Source www.wireshark.org Pcap Previously called Ethereal Promiscuous mode Legal stuff

OSI Model 7 Application 6 Presentation 5 Session 4 Transport 3 Network Telnet, e-mail 6 Presentation Pict, GIF 5 Session NFS, SQL 4 Transport TCP,UDP,SPX 3 Network IPv4, IPv6, IPX 2 Data Link Ethernet, Token Ring 1 Physical Copper, Fiber, Radio Waves

Ethernet Frame

Rabbit Hole Serial Communications What settings does a Cisco console port use? 9600 8N1

Serial line sending “OK” At 9600 Bits Per Second 1/(9600 bps) or 104 µs per bit. Decimal Hex Binary 0 0 0000 1 1 0001 2 2 0010 3 3 0011 4 4 0100 5 5 0101 6 6 0110 7 7 0111 8 8 1000 9 9 1001 10 A 1010 11 B 1011 12 C 1100 13 D 1101 14 E 1110 15 F 1111 4F 01001111

IPv4 Packet Ethernet Frame

IPv6 Packet Header Ethernet Frame

Screen Shot

Getting Packets On your machine Hub Switch Tap Mirror a port SPAN Watch your link utilization! Mirror a port SPAN Tap

Live

Install Wireshark 2. 6. 0 (May 2, 2018) https://www. wireshark

Sample Captures https://wiki.wireshark.org/SampleCaptures#Sample_Captures

Questions? Roy Hoover roy_hoover@iu13.org