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 [FULL GUIDE] ARP Spoofing / Poisoning [DON'T MISS IT]

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PostSubject: [FULL GUIDE] ARP Spoofing / Poisoning [DON'T MISS IT]   Sat Apr 16, 2011 12:44 pm

What is this?
The ARP Poisoning or ARP Poison Routing is a technique used to infiltrate a switched Ethernet network (based on switch and not hubs), which can allow an attacker to sniff data packets on the LAN (local area network), to amend traffic, or even stop the traffic (known as DoS: Denial of Service).

The principle of ARP spoofing is to send fake ARP messages (fake, or spoofed) to the Ethernet. Usually the purpose is to associate the attacker's MAC address with the IP address of another node (the node under attack), such as the default gateway (gateway). Any traffic to the IP address of that node, is mistakenly sent to the attacker, instead of your actual destination. The attacker can then choose among forward traffic to the real default gateway (passive attack or listening), or modify the data before forwarding (active attack). The attacker can even launch a DoS attack (Denial of Service) against a slave by associating a nonexistent MAC address to the IP address of the default gateway of the slave.

THE ARP spoofing attack can be executed from a controlled machine (the attacker has previously managed to take control of it: intrusion), a Jack Box, or the attacker's machine is connected directly to the Ethernet LAN.

How to apply?

ARP is a protocol layer 2 (link). Both packages *** 8220; ARP request *** 8221; as 8220 ***, 8221 *** ARP reply, can be broadcast traffic (broadcast). As such, they are designed to provide any validation of the transaction identification.

While ARP spoofing can be run during ARP transactions, creating a race condition (race condition), the most common use is the distribution of unsolicited ARP responses, which are stored by customers on their ARP caches, generating Thus the stage *** 8220; ARP Cache Poison *** 8221;, or poisoned ARP caches.


How do I defend myself?

A method to prevent ARP spoofing is to use static ARP tables, ie add static ARP entries, so there is no dynamic cache, each table entry maps a MAC address with its corresponding IP address. However, this is not a practical solution, especially on large networks because of the enormous effort required to maintain ARP tables updated, every time you change the IP address of a computer, you must update all the tables of all teams network.

Therefore, in large networks it is preferable to use another method: the DHCP snooping. Using DHCP, the network device keeps track of MAC addresses that are connected to each port, so that quickly detects if it receives an ARP spoofing. This method is implemented in the network equipment manufacturers like Cisco, Extreme Networks and Allied Telesis.

Another way to defend against ARP spoofing is detected. Arpwatch is a Unix program that listens on the network ARP replies, and sends a notification via email to the administrator of the network, when an ARP entry changes.

Check for cloned MAC addresses (corresponding to different IP addresses) can also be an indication of the presence of ARP spoofing, but we must keep in mind that there are legitimate uses of MAC address cloning.

RARP (*** 8220, *** 8221 Reverse ARP, or Reverse ARP) is the protocol used to query, from a MAC address, your IP address. If response to a question, RARP returns more than one IP address, MAC address means that has been cloned.

Do you have legitimate uses?

If the ARP Spoofing can also be used for legitimate purposes. For example, some network logging tools, equipment can be redirected to a page unregistered registration before allowing full network access.

Another legitimate implementation of ARP spoofing is used in hotels to allow Internet access to customers' laptops from their rooms, using a device known as HEP (Head-End Processor or Processor Header), regardless of their IP address.

The ARP Spoofing can also be used to implement redundancy of network services. A backup server can use ARP spoofing to replace a failed server, and thus provide redundancy in a transparent manner.

What tools I can use to implement the ARP spoofing (ARP Poisoning)?

Arpspoof (some of the tools DSniff) Arpoison, Cain and Abel, Ettercap and netCut are some tools you can use to perform ARP Poisoning attacks.

Credits: Wikipedia (PM me if you need any kind of assistance.)
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