arp

We know that when we enter a URL in the browser, the DNS server automatically resolves it as an IP address. The browser actually looks for an IP address instead of a URL. So how does the IP address be converted to the second physical address, that is, the MAC address? In Lan, this is done through ARP. ARP is of great significance to network security. ARP spoofing

When we use a LAN, we are vulnerable to ARP spoofing attacks. How can this problem be effectively prevented? This article will describe the principles of this aspect. There are many methods to prevent attacks. Based on my experience, this article describes how to prevent ARP spoofing, the methods mentioned in this article are applicable to Internet cafes or common LAN. enterprises can release network manage

ARP spoofing, also known as ARP virus or ARP attack, is an attack technique for Ethernet Address Resolution Protocol (ARP). Such an attack could allow an attacker to obtain data packets or even tamper with data packets on the local area network, and to make it possible for a particular computer or all computers on the

The IP address is not only implemented by the IP protocol, but also by many small protocols. The notorious ARP protocol is also one of them. Why is it notorious? Because the vulnerabilities and attacks against this Protocol have always been an important precaution for our security issues. I. Working Principle of ARP In the tcp ip protocol, each network node is identified by an IP address, and the IP address

1. Network Attack topology EnvironmentGateway: 192.168.133.2Attacker: 192.168.133.128Victim: 192.168.133.1372, the principle explanation ARP DeceptionSummary: ARP (address Resolution Protocol) is a protocol for resolving IP addresses into physical addresses. There are two ways to map from IP addresses to physical addresses: tabular and non-tabular. ARP specifical

To understand ARP spoofing attacks, we first need to understand the ARP protocol and its working principle, in order to better protect against and eliminate the harm caused by ARP attacks. This article brings the advanced ARP attack prevention method. Basic ARP Introduction

Arp proxy Overview 1. Free arp: The difference between free ARP packets and normal arp request packets is that normal arp request packets. The "Destination IP address" In ARP encapsulation is the IP address of other machines, for

Background:(1) According to the default TCP/IP protocol stack processing, the source address of the response message is equal to the destination IP of the request message.(2) about the ARP table: IP, MAC, network Interface mapping table, the IP in the list belongs to the network segment of the device, send/forward non-local network segment is through the gateway, so only need to use the gateway corresponding to the MAC. (3) The condition of th

Network Security: Analysis of ARP cache infection attacks (lower) Man-in-the-middle attack Hackers use ARP cache poisoning to intercept network information between two devices in your LAN. For example, we assume that hackers want to intercept communication information between your computer, 192.168.0.12, and your network router (that is, the gateway, the Translator's note) and 192.168.0.1. The hacker first

From -- http://blog.csdn.net/zhangnn5/article/details/6810347 Reading this articleArticleBefore that, I suppose you already know the TCP/IP protocol, ARP protocol, What Is sniffer, and other basic network knowledge.In a General Lan, there are usually two access methods, one is hub access (The Hub here refers to the general hub ), one is direct access from a vswitch (the vswitch here is a relatively advanced vswitch, which is not included in the old-

ARP viruses are manifested in frequent disconnection or disconnection of some computer hosts that are surfing the internet in the LAN. I. Fault Causes and PhenomenaSome computers in the LAN use ARP spoofing.Program(For example, the legendary or QQ account stealing software) sends ARP packets, making the attacked computer unable to access the Internet.When a c

Recently, many Internet cafes in China have been disconnected for a short period of time (full or partial), but will be automatically restored in a short period of time. This is caused by a MAC address conflict. When the MAC address of a computer with a virus maps to a NAT device such as a host or vro, the whole network is disconnected. If it is mapped to only other machines in the network, then there is only a problem with this part of the machine. It is often used in legend games, especially p

Recently, the LAN of xiaowu is always unstable, and network disconnection occurs. It has brought a lot of changes to the work of colleagues on the Internet. At first, Xiao Wu thought that the information center in the Bureau was faulty? However, Xiao Wu found that the dropped lines were getting more and more frequent. After contacting the information center, the computer in other units was found to be normal and no disconnection occurred. Xiaowu determines that the problem occurs in his unit. Af

Sniffing can be easily implemented in the Age of hub prevalence You don't need to do anything. The hub will automatically send others' packets to your machine. But that time has passed, and nowVswitchInstead of hubs, vswitches will no longer forward packets that do not belong to you, you can no longer easily listen to other people's information. (If you are not familiar with the hub and switch working principles, you can read the article 《Basic network knowledge: hubs, bridges, and switchesMachi

0 × 01.1What is gateway First, let's briefly explain what a gateway is. The Gateway works in the transport layer or application layer of the OSI Layer-7 model and is used for the connection between different networks of the high-level protocol. Simply put, A gateway is like a door connecting a room to another room. 0 × 01.2 ARPWhat is the protocol? ARP (Address Resolution Protocol) Address translation Protocol works at the data link layer of the OSI

I. Working principle: A. Determine the illegal access MAC address in the network based on the DHCP Snooping or the manually formed MAC address and IP Address binding table. B. to prevent malicious ARP spoofing, the arp REQUEST packets of the interface can be limited. --- Tests show that arp requests and replies (including unreasonable

Introduction to dynamic ARP detection (DAI) Dynamic ARP detection (DAI) is a security feature used to verify ARP packets in the network. When Dai is enabled, all ARP packets are detected, valid ARP packets are forwarded, and illegal ARP