Wireshark. Fakrul (Pappu) Alam
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1 Wireshark Fakrul (Pappu) Alam
2 What is Wireshark? Wireshark is a network packet/protocol analyzer. A network packet analyzer will try to capture network packets and tries to display that packet data as detailed as possible. Wireshark is perhaps one of the best open source packet analyzers available today for UNIX and Windows.
3 About Wireshark Formerly known as Ethereal Author, Gerald Combs quit Network Integration Services Free Requirement Need to install winpcap Latest wireshark installer contains winpcap, don t worry (On Windows Vista) Need Administrator Privilege to capture GUI Dramatically improved
4 Why Wireshark network administrators use it to troubleshoot network problems network security engineers use it to examine security problems developers use it to debug protocol implementations people use it to learn network protocol internals Wireshark isn't an intrusion detection system. Wireshark will not manipulate things on the network, it will only "measure" things from it.
5 How to Install Very straight forward Just double-click and follow the instructions.
6 Capture
7 Dashboard Menu Filter Capture Data Raw Data
8 Filters Capture filter Capture Traffic that match capture filter rule save disk space prevent packet loss Display filter Tweak appearance
9 Apply Filters ip.addr == [Sets a filter for any packet with , as either the source or dest] ip.addr== && ip.addr== [sets a conversation filter between the two defined IP addresses] http or dns [sets a filter to display all http and dns] tcp.port==4000 [sets a filter for any TCP packet with 4000 as a source or dest port] tcp.flags.reset==1 [displays all TCP resets] http.request [displays all HTTP GET requests] tcp contains rviews [displays all TCP packets that contain the word rviews. Excellent when searching on a specific string or user ID]!(arp or icmp or dns) [masks out arp, icmp, dns, or whatever other protocols may be background noise. Allowing you to focus on the traffic of interest]
10 Follow TCP Stream
11 Follow TCP Stream Build TCP Stream Select TCP Packet -> Follow TCP Stream
12 Use Statistics What protocol is used in your network Statistics -> Protocol Hierarchy
13 Use Statistics Which host most chatty Statistics -> Conversations
14 Use Statistics Make graph Statistics -> IO Graph
15 Need CLI? If you stick to character based interface, try tshark.exe C:\program files\wireshark\tshark.exe
16 Tcpdump & Wireshark tcpdump -i <interface> -s w <some-file>
17 Exercise Install Wireshark into your PC Run wireshark and Capture inbound/outbound traffic Download capture files from Follow the instructor's guide.
18 Exercise1: Good Old Telnet File telnet.pcap Question Reconstruct the telnet session. Q1: Who logged into Username, Password. Q2: After logged in what did the user do? Tip telnet traffic is not secure
19 Exercise 2: Massive TCP SYN File massivesyn1.pcap and massivesyn2.pcap Question Point the difference with them. Q1: massivesyn1.pcap is a attempt. Q2: massivesyn2.pcap is a attempt. Tip Pay attention to Src IP
20 Exercise 3: Compare the traffic Scenario You re an IT admin of company X. You had a report that Jim (a new employee) can not browse or mail with his laptop. After researching you found that Risa, sitting next to Jim, can brose without any problem. File Risa.pcap, jim.pcap Question Compare the capture file from both machines and find out why Jim s machine is not online. Jim must. Tip Pay attention to the first arp packet.
21 Exercise 4: Chatty Employees File chat.dmp Question Q1: What kind protocol is used? Q2: This is conversation Q3: What do they say about you(sysadmin)? Tip Your chat can be monitored by network admin.
22 Exercise 5: Suspicious FTP activity File ftp1.pcap Question Tip Q1: is FTP. Q2: is FTP. Q3: FTP Err Code 530 means. Q4: attempt. How many login error occur within a minute?
23 Exercise 6: Unidentified Traffic File Foobar.pcap Question Q1: see what s going on with wireshark gui Statistics -> Conversation List -> TCP (*) Q2: Which application use TCP/6346? Check the web.
24 Exercise 7: Covert channel File covertinfo.pcap Question Take a closer look! This is not a typical ICMP Echo/ Reply Q1: What kind of tool do they use? Check the web. Q2: Name other application which tunneling user traffic.
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