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Manual abstract: user guide CACE TECHNOLOGIES ARPOVERVIEW V1.1
Detailed instructions for use are in the User's Guide.
[. . . ] ARP Injection Overview
Revision 1. 1
ARP Defined
Address Resolution Protocol (ARP) is a protocol to handle conversions from a host's network layer address to its hardware address. 1 In other words, ARP enables devices to discover the connection between a host's IP address and its MAC address. [. . . ] ARP messages are interesting for three reasons: ARP requests elicit ARP replies; ARP requests are of fixed, known size; and ARP requests are small, thus they are able to be transmitted in large quantity. Fixed packet size is important as packets of a fixed size are easy to identify without the need to decrypt them. This unique property can be used to identify ARP requests even on a network for which it doesn't have a decryption key. Once an ARP request is identified on the target network, it is then replayed many times per second. For a normal ARP request, this elicits an ARP reply from the target for every ARP request, with the benefit that every ARP reply carries a new WEP Initialization Vector. Because of this, transmitting ARP requests can be very useful for coaxing the target network into generating the wireless traffic necessary for an attack. For this reason, this technique is the most effective way used by well-known tools like Cain & Abel and aircrack-ng to speed up the retrieval of a network's WEP key.
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RFC 826 - Address Resolution Protocol, a. k. a. STD 37 Wireshark Gratuitous ARP - wiki. wireshark. org/Gratuitous_ARP 3 How to Disable the Gratuitous ARP Function - support. microsoft. com/kb/219374
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Why Injecting ARP Requests Might Not Generate Unique IVs
If the replayed request is a Gratuitous ARP Request, normally the request will not elicit any response. [. . . ] The result is that, in some cases, Cain & Abel or aircrack-ng will see something that looks like an ARP packet and start replaying it, but this will generate no responses (and, therefore, no Unique IVs).
Additional Information
· · · · Wireshark Wiki - wiki. wireshark. org/Gratuitous_ARP o A good overview of Gratuitous ARP with examples RFC 826 - tools. ietf. org/html/rfc826 o The official specification Header Format - www. networksorcery. com/enp/protocol/arp. htm o Map of the ARP protocol Wikipedia - en. wikipedia. org/wiki/Address_Resolution_Protocol o General overview of ARP
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