arp 2800

GratuitousARP (free ARP)Detailed explanation of ARP Protocol Gratuitous ARP (free ARP) Gratuitous ARP is also known as free ARP, no reason ARP. Gratuitous

This article introduces the principle of ARP attack and the network security problem caused by it, in combination with the actual situation, this paper puts forward a multi-level prevention method in the campus network to solve the network security problem caused by ARP attack, and finally introduces some effective methods to detect and defend against attack with strong practicability and simple operation.

[Fault Cause] Someone in the LAN uses ARP spoofing Trojans (for example, some legendary plug-ins are also maliciously loaded by the legendary software ). [Fault principle] To understand the fault principle, Let's first look at the ARP protocol. In a LAN, ARP is used to convert an IP address to a layer 2 physical address (MAC address.

 I. ARP and RARPNetwork transmission, according to the destination IP address through the route selection can be transmitted over the Internet, but if you do not know the destination interface, then you do not know the packet to a network or a subnet which host. ARP (Address Resolution Protocol) can be based on the destination IP to obtain the interface so that the two host computer to communicate properl

In Ethernet, whether it is a computer Nic or an interface of a network device, there is a mac address that we think is the only physical address in the world, is a TCP/IP protocol used to obtain the physical address of the device. When a data packet is to be forwarded, we only know the destination IP address of the data packet, but the data packet must be transmitted through a layer-2 encapsulation of the Ethernet packet ), in the Ethernet package, the source physical address is your mac addre

I encountered a problem today. My colleague asked me how to prevent arp spoofing In The LVS environment. I am not very familiar with LVS. So I went to the whitehat group to ask questions and read the LVS information, make a simple analysis and record it. First, let's take a look at LVS. LVS is short for Linux Virtual Server. its official website is:Http://www.linuxvirtualserver.org/zh/lvs3.htmlAmong them, LVS mainly uses three IP load balancing techno

Sniffer is a tool used to transmit data from a network. To achieve this goal, the general approach is to set the NIC to the hybrid mode, so that you can sniff all the data passing through the local NIC (this general sniffer principle is not described here ). However, Sniffer has a disadvantage that it is only applicable to shared LAN and is not valid for switched LAN. Because the data in the network does not pass through the NIC of each host in the switched Lan, you must use another more active

toilet. James secretly touched the transfer room and carefully changed Grandpa Wang's address book ...... After a few days, Xiaoli's boyfriend called Xiaoli again. The phone number reported by the other party was "7654321". grandpa Wang looked at the address book and relied on: House phone number Gate 1, 1234567 (this is James's) Door 1, 7654321 (Note: This was originally from Lili, but it was changed by James) ...... Grandpa Wang didn't know how to change it, so he went to the door

The structure ether_header defines the Ethernet frame header; the structure arphdr defines the next five fields, and its information is used to transmit ARP requests and answers on any type of media; in addition to the arphdr structure, the ether_arp structure also contains the addresses of the source and target hosts. Definition #define EPT_IP 0x0800 /* type: IP */#define EPT_ARP 0x0806 /* type: ARP