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TSS Academy. Troubleshooting with. So What is WireShark?. Open Source Network Tool Packet sniffer/protocol analyzer. 0010100100101011101010101. WiFi Packet Sniffing Association Issues. Air PCAP (Hardware). Cascade Pilot (Commercial). From the F irehose.

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tss academy

TSS Academy

Troubleshooting with

so what is wireshark
So What is WireShark?
  • Open Source Network Tool
  • Packet sniffer/protocol analyzer


from the f irehose
From the Firehose

One gigabit per second, equates to over 83,000 packets per second, or only 12 microseconds per packet. 

wireshark process
Wireshark Process
  • Capture Traffic
  • Display & Analyze Traffic
  • Summarize Traffic

interface FastEthernet0/1

port monitor FastEthernet0/2


interface FastEthernet0/1

port monitor FastEthernet0/2 rx

Interface FastEthernet0/3

port monitor FastEthernet0/2 tx

vlan monitoring
VLAN Monitoring

interface FastEthernet0/1

port monitor VLAN1

promiscuous mode
“Promiscuous” Mode
  • Ethernet Frames are Addressed.
  • Ethernet NICs ignore frames not for them.
install wireshark on client server
Install Wireshark on Client/Server
  • Wireshark runs on demand.
  • WinPCAP can be disabled in Services.
capture filter examples
Capture Filter Examples


host and host


net mask

src net

port 53

tcp port http


not broadcast not multicast

ether host 00:04:13:00:09:a3

display post filters
Display (Post) Filters
  • Display filters (also called post-filters) only filter the view of what you are seeing. All packets in the capture still exist in the trace
  • Display filters use their own format and are much more powerful then capture filters
display filter expression builder
Display Filter Expression Builder

To Search.. Just type….

display filter examples
Display Filter Examples


ip.addr== && ip.addr==

tcp.port==80 || tcp.port==3389

!(ip.addr== && ip.addr==

(ip.addr== && ip.addr== && (tcp.port==445 || tcp.port==139)

(ip.addr== && ip.addr== && (udp.port==67 || udp.port==68)

display example
Display Example

dns.qry.name == "www.youtube.com"

and not dns.resp.addr ==

follow tcp stream1
Follow TCP Stream

red - stuff you sent blue - stuff you get

resources credits
Resources & Credits
  • Wireshark WIKI http://wiki.wireshark.org
  • http://ilta.ebiz.uapps.net/ProductFiles/productfiles/672/wireshark.ppt‎
  • www.wiresharkuniversity.com