The raw packets in the radio waves without ever having to attach to a WAP. In monitor mode, the wireless network card listens to Operating System) the attacker may be able to use what is known as monitor mode If the attacker is using Linux (or another Unix like
Will have to be attached to the wireless networks WAP (Wireless Access Point) toīe able to see anything. If the sniffer's card does support promiscuous mode it Wired network card in Windows and Linux (or other Unix like Operating System),īut not all wireless cards support it properly (like Intel's Centrino 802.11gĬhipset know as IPW2200). Promiscuous mode works on pretty much any Of the computer running the sniffer to see the data traveling to other computersĪttached to the same access point.
Traffic going to other computers and will instead look at it, allowing the user Network card is put into what is known as promiscuous mode, it will not ignore Reality it's a little more complicated than that, but I want this to be anĪrticle and not a book on the intricacies of 802.11 networks) However, if a Traffic destined to others but normally they just choose to ignore it. Wireless LANs actĪ lot like Ethernet LANs using hubs. The above is about Ethernet networks, WiFi
Mirroring traffic to all ports or by a technique know as ARP poisoning (more on Sniffed using the mirrored port on some switches (put there so administratorsĬan use a Sniffer to diagnose network problems), by confusing the switch into
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On the LAN) and packets addresses to its MAC along with the occasional stray Switched network a node can only see broadcast messages (meant for all computers Number of collisions on the network, increasing throughput. Packets only to the nodes they are intended for. A switch on the other hand looks at the MACĪddress of the nodes hooked to it and what ports they are on then tries to send On a network, a hub is a passive device that sends all traffic it Possibility of sniffing data that does not belong to a node, most networks use To cut down on the number of collisions and the Is put into what is known as "promiscuous mode" it will look at all of the The packets that are destined for its MAC address. To send packets of information to each other. Network have their own unique MAC (media access control) address that they use Words in during a lull in everybody else's conversation.
Think of CSMA/CD as being like a conversation atĪ loud party, you may have to wait for quite a spell for your chance to get your Sending data using a scheme known as carrier sense multiple access withĬollision detection (CSMA/CD). All of the nodes (computers and otherĭevices) on the network could communicate over the same wires and take turns Most Ethernet networks use to be of a common bus topology, using eitherĬoax cable or twisted pair wire and a hub. Unix like operating system like Linux or FreeBSD-) and its Windows versionįirst an explanation of some network basics is in Sniffer (commercial), Wireshark (previously know as Ethereal, an Open Source GUI Sniffer for Linux, WindowsĪnd other platforms), TCPDump (Open Source command line Sniffer for *nix - any A few popular general purpose Sniffers are NAI Useful tools for deviant computer users since they can be used to pull plain
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A Sniffer (also know as a Network Analyzer) is a piece of software that can lookĪt network traffic, decode it, and give meaningful data that a networkĪdministrator can use to diagnose problems on a network. When I tell some of my coworkers that I'm sniffing the network, they have a tendency to look at me funny. Wireshark/Ethereal, ARPSpoof, Ettercap, ARP poisoning and other niceties. A Quick Intro to Sniffers: Wireshark/Ethereal, ARPSpoof, Ettercap, ARP
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