TSS Academy Troubleshooting with.

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Presentation transcript:

TSS Academy Troubleshooting with

So What is WireShark? Open Source Network Tool Packet sniffer/protocol analyzer 0010100100101011101010101

Air PCAP (Hardware) WiFi Packet Sniffing Association Issues

Cascade Pilot (Commercial)

From the Firehose One gigabit per second, equates to over 83,000 packets per second, or only 12 microseconds per packet. http://sd.wareonearth.com/~phil/issues.html

Wireshark Process Capture Traffic Display & Analyze Traffic Summarize Traffic

Where do I put WireShark?

Location, Location, Location

Hub

Switches

Switch with a SPAN port

TAP

HUBS

Switch interface FastEthernet0/1 port monitor FastEthernet0/2

Switch interface FastEthernet0/1 port monitor FastEthernet0/2 rx Interface FastEthernet0/3 port monitor FastEthernet0/2 tx

VLAN Monitoring interface FastEthernet0/1 port monitor VLAN1

“Promiscuous” Mode Ethernet Frames are Addressed. Ethernet NICs ignore frames not for them.

Install Wireshark on Client/Server Wireshark runs on demand. WinPCAP can be disabled in Services.

Selectively Ignore Traffic

Capture Filter Examples host 10.1.11.24 host 192.168.0.1 and host 10.1.11.1 net 192.168.0.0/24 net 192.168.0.0 mask 255.255.255.0 src net 192.168.0.0/24 port 53 tcp port http ip not broadcast not multicast ether host 00:04:13:00:09:a3

Capture Filter

Capture Options

Capture Interfaces

Capturing Data (Capture Window)

Stopping the Packet Capture

Displaying Packets

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

Wireshark Display Filter CheatSheet (packetlife.net)

Display Filter Expression Builder To Search.. Just type….

Display Filter Examples ip.src==10.1.11.24 ip.addr==192.168.1.10 && ip.addr==192.168.1.20 tcp.port==80 || tcp.port==3389 !(ip.addr==192.168.1.10 && ip.addr==192.168.1.20) (ip.addr==192.168.1.10 && ip.addr==192.168.1.20) && (tcp.port==445 || tcp.port==139) (ip.addr==192.168.1.10 && ip.addr==192.168.1.20) && (udp.port==67 || udp.port==68)

Display Example dns.qry.name == "www.youtube.com" and not dns.resp.addr == 208.70.74.21

Analyzing Data

Statistics Menu

I/O Graph (With Filters)

Protocol Hierarchy

Protocol Hierarchy

Follow TCP Stream

Follow TCP Stream red - stuff you sent blue - stuff you get

Resources & Credits Wireshark WIKI http://wiki.wireshark.org http://ilta.ebiz.uapps.net/ProductFiles/produ ctfiles/672/wireshark.ppt‎ www.wiresharkuniversity.com