7.1.6 Lab - Use Wireshark to Examine Ethernet Frames (Answers) It uses the Wireshark manufacturer database, which is a list of OUIs and MAC addresses compiled from a number of sources. To only … An IP address is a unique identifier used to route traffic on the network layer of the OSI model. To stop capturing, press Ctrl+E. Wireshark does the rest. Step 2: Examine Ethernet frames in a Wireshark capture. 2.Request URI: /wireshark-labs/alice.txt ==> The client is asking for file alice.txt present under /Wireshark-labs. Requirements Wireshark: This lab uses the Wireshark software tool to capture and examine a packet trace. The Wireshark capture below shows the packets generated by a ping being issued from a PC host to its default gateway. The following table takes the first frame in the Wireshark capture and displays the data in the Ethernet II header fields. Unplug the Ethernet cable from the Biamp device, wait 5 seconds, and plug it back in. The value of the source address is 00:1f:6c:be:cf:bf. IPv6 was initially designed with a compelling reason in mind: the need for more IP addresses. Active Gateway IP Address: IPv4 address: 1.10.0 to 3.4.6: cip.dlr.aga.physical_address: … Address: Ethernet or other MAC address: 1.0.0 to 3.4.6: eth.addr.oui: Address OUI: … Step 1: Review the Ethernet II header field descriptions and lengths. Ethernet (and other 802.x networks) Ethernet has designated the all-ones address (ff:ff:ff:ff:ff:ff) for broadcast traffic; this is used for other 802.x networks as well. Using Wireshark, you can watch network traffic in real-time, and look inside to see what data is moving across the wire. The destination address may be a broadcast, which contains all ones, or a unicast. IP addr = 128.208.2.151 IP addr = 74.125.127.106 Eth addr = 00:00:5e:00:01:01 IP addr = ? The mask does not need to match your local subnet mask since it is used to define the range. This is once again the address of the router that has recieved the ok and forwarded it to my computer. 15. Source Address: IntelCor_62:62:6d (f4:8c:50:62:62:6d) Frame Type: 0x0806: For Ethernet II frames, this field contains a hexadecimal value that is used to indicate the type of upper-layer protocol in the data field. IPv6 is short for "Internet Protocol version 6". 6. What is the value of the Ethernet source address? Note the Default Gateway displayed. The data transfer is independent of the underlying network hardware (e.g. If I wanted to display the IP addresses from the 192.168.1.1 to 192.168.1.254, my filter would be ip.addr == 192.168.1.0/24 or ip.addr eq 192.168.1.0/24. Required Resources. Furthermore, I know I can filter on a particular IP subnet with ip net 10.0.0.0/24. The first three bytes of the address are assigned to a specific vendor or organization; they're referred to as an Organizationally Unique Identifier, or an OUI. There are other ways to initiate packet capturing. During the lease time, the DHCP server will not assign the IP given to the client to another client, unless it is released by the client. What are the hexadecimal values for the source and destination addresses in the Ethernet frame containing the ARP reply message? The simplest display filter is one that displays a single protocol. ARP stands for address resolution protocol. The source MAC address is the one of the sender (the one encircled in red) and the destination MAC address is of the receiver. But there is yet another computer on this network, as indiated by packet 6 – another ARP request. IP will (hopefully) guide the packet the right way to the remote host. Extra Credit EX-1. Figure 3: Ethernet and IP addresses of network devices Your computer Router Remote server Ethernet LAN Rest of Internet Eth addr = 00:25:64:d5:10:d8 Eth addr = ?? To give a meaningful answer, we need to see the actual Ethernet frames, including hardware addresses, IP addresses, and opcode field. running Wireshark, and the ARP reply sent to the computer running Wireshark by the computer with the ARP-requested Ethernet address. Wait 60-90 seconds while network traffic is recorded. Is this the Ethernet address of gaia.cs.umass.edu? The screenshots of the Wireshark … The source address is always unicast. ARP is an essential glue protocol that is used to join Ethernet and IP. If you think of your local network as a neighborhood, a network address is analogous to a house number. A filter has been applied to Wireshark to view the ARP and ICMP protocols only. What are Ethernet, IP and TCP Headers in Wireshark Captures. Similarly, the all-ones IP address (255.255.255.255) is broadcast. Is there a similar capture filter syntax for Ethernet MAC addresses? It lets you see what’s happening on your network at a microscopic level and is the de facto (and often de jure) standard across many commercial and non-profit enterprises, government agencies, and educational institutions. The first and second ARP packets in this trace correspond to an ARP request sent by the computer running Wireshark, and the ARP reply sent to the computer running Wireshark by the computer with the ARP-requested Ethernet address. • Stop Wireshark … In the Wireshark Capture Interfaces window, select Start . Filtering Specific IP in Wireshark Use the following display filter to show all packets that contain the specific IP in either or both the source and destination columns: ip.addr == 192.168.2.11 This expression translates to “pass all traffic with a source IPv4 address of 192.168.2.11 or a destination IPv4 address of 192.168.2.11.” A packet –a means automatically stop the capture, -i specifics which interface to capture; Metrics and Statistics The user of this layer will give a packet and a remote IP address, and IP is responsible to transfer the packet to that host. Destination (dst) Destination address. Protocol. Broadcast addresses are usually used by ARP, DHCP, and other protocols that do some sort of discovery. computer to issue an ARP request to determine the Ethernet address of the computer you are pinging, assuming that the information is not already present in your computer’s ARP cache. What is the 48-bit destination address in the Ethernet frame? 08:00:20. Step 4: Examine the Ethernet II header contents of an ARP request. This field contains synchronizing bits, processed by the NIC hardware. IPv4. Once the lease time has expired, the IP address can be reused by the DHCP server to give to another client. An Ethernet host is addressed by its Ethernet MAC address, a 6 byte number usually displayed as: 08:00:08:15:ca:fe (the delimiters vary, so you might see 08-00-08-15-ca-fe or the like). ANSWER: The destination address 00:0c:41:45:90:a8 is not the Ethernet address of gaia.cs.umass.edu. Stop the Wireshark capture. The hex value for the source address is 00:06:25:da:af:73 and for the destination is 00:d0:59:a9:3d:68 . The destination address may be a broadcast, which contains all ones, or a unicast. 17.6K views Examples: 0000.0c. Each address is 48 bits long, or 6 octets, expressed as 12 hexadecimal digits, 0-9,A-F. A common format is 12:34:56:78:9A:BC. The source address is always unicast. Wireshark automates OUI lookup, which makes it very easy to identify the vendor of any given network adapter. Select File > Save As or choose an Export option to record the capture. Source address, commonly an IPv4, IPv6 or Ethernet address. When u click on a packet/frame corresponding window highlights: Here if you expand the Ethernet Section you will see source and destination address. You need to know the IP address or hostname of the target machine. Length of the frame in bytes. The screenshots of the Wireshark capture below shows the packets generated by a ping being issued from a PC host to its default gateway. Is this the address of your computer, or of gaia.cs.umass.edu (Hint: the answer is no). Ethernet address 00:06:25:da:af:73 for the sender with IP address 192.168.1.1. Why is there no ARP reply (sent in response to the ARP request in packet 6) in the packet trace? Step 3: Examine Ethernet frames in a Wireshark capture. Wireshark is the world’s foremost and widely-used network protocol analyzer. Layer 2 addresses for the frame. Protocol used in the Ethernet frame, IP packet, or TCP segment. A filter has been applied to Wireshark to view the ARP and ICMP protocols only. HTTP GET: After TCP 3-way handshake [SYN, SYN+ACK and ACK packets] is done HTTP GET request is sent to the server and here are the important fields in the packet. Stop the live capture in Wireshark. But there is yet another computer on this network, as indicated by packet 6 – another ARP request. Step 3: Examine Ethernet frames in a Wireshark capture. OUI lookup in Wireshark. Select the shark fin on the left side of the Wireshark toolbar, press Ctrl+E, or double-click the network. In the latest (nightly) wireshark 1.11 builds, you can get the raw string of a buffer as a raw Lua string, and just compare that to your ethernet address (as a binary Lua string, not ASCII characters); and there're also functions to convert to/from hex … Use ipconfig to display the default gateway address. ATM, Ethernet, or even a SerialLine). If the Ethernet destination address and the target hardware address are the same, that simply means that it is a unicast ARP, which can be seen in different circumstances. If I could go back in time when I was a n00b kid wanting to go from zero to a million in networking, the one thing I would change would be spending about 6 months on the fundamentals of networking headers and framing before ever touching a single peice of vendor gear. (Capture > Stop) In the Filter field, type “llc” (lowercase LLC). Answer: The lease time is the amount of time the DHCP server assigns an IP address to a client. Part 2: Use Wireshark to Capture and Analyze Ethernet Frames Any host generating traffic within your network should have three identifiers: a MAC address, an IP address, and a hostname. To capture Ethernet traffic: Start a Wireshark capture. running Wireshark, and the ARP reply sent to the computer running Wireshark by the computer with the ARP-requested Ethernet address. Wireshark is a useful tool for anyone working with networks and can be used with most labs in the CCNA courses for data analysis and troubleshooting. Display Filter Fields. What device has this as its Ethernet address? Why is there no ARP reply (sent in response to the ARP request in packet 6) in the packet trace? Directions: Type or paste in a list of OUIs, MAC addresses, or descriptions below. Wireshark is an essential tool for network administrators, but very few of them get to unleash its full potential. To see how ARP (Address Resolution Protocol) works. 5. OUIs and MAC addresses may be colon-, hyphen-, or period-separated. How do we find such host information using IPv6 is the "next generation" protocol designed by the IETF to replace the current version of Internet_Protocol, IP Version 4 or IPv4. But there is yet another computer on this network, as indicated by packet 6 – another ARP request. By specifying the MAC address filter, eth.addr eq xx:xx:xx:xx:xx:xx you are filtering for all traffic to and from that associated MAC address. In this lab, you will use Wireshark to capture ICMP data packet IP addresses and Ethernet frame MAC addresses. Length. Activity 1 - Capture Ethernet Traffic Edit. 01-00-0C-CC-CC-CC. ANSWER: The Ethernet address of my computer is 00:09:5b:61:8e:6d 2. The Source column should show a list of IP addresses. If you have access to full packet capture of your network traffic, a pcap retrieved on an internal IP address should reveal an associated MAC address and hostname. wireshark –h : show available command line parameters for Wireshark; wireshark –a duration:300 –i eth1 –w wireshark. In most cases, alerts for suspicious activity are based on IP addresses. Run the following operation in the Filter box: ip.addr== [IP address] and hit Enter. The first six hex numbers indicate the manufacturer of the network interface card (NIC), the last six hex numbers are the serial number of the NIC. 1.Request Method: GET ==> The packet is a HTTP GET . : capture traffic on the Ethernet interface 1 for 5 minutes. Keyboard Shortcuts. I know that I can filter on a specific Ethernet MAC address using the capture filter ether host 00:04:a3:00:00:00. Step 2: Examine the network configuration of the PC. What device has this as its Ethernet address? ? Use ping to ping the default gateway address. 14. 1 PC (Windows with internet access)

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