arp

Today, I reviewed TCP/IP routing technology. I once again saw the transparent subnet problem mentioned in proxy ARP, and thought of the classic gateway problem, so I decided to carefully analyze and sort out how to understand various situations. Environment: one Chinese XP and one English XP. The dual-host can be directly connected through a crossover line. Capture packets from Sniffer.A: IP 10.1.1.1/8 B: IP 11.1.1.1/8 From: http://www.mycisco.cn > 1.

We often talk about ARP attacks and other security issues in the network. What is ARP here? It is the ARP Address Resolution Protocol. Here, we will not talk about its security issues for the moment, so let's briefly talk about its basic meaning and data structure. ARP Address Resolution Protocol Address Resolution Pro

-FF), then, the packet will be received, and if not, the NIC will discard it directly. However, there is a premise that the NIC of the computer on the receiving end works in normal mode. If the NIC is set to the hybrid mode, it can receive all the packets that pass through (including, of course, packets whose destination is not local ). That is to say, as long as the packet is sent to the LAN, it will be received by the NIC in the mixed mode! This is the basic principle of Sniffer. As for the sp

TCP/Socket learning-ARP datagram format ARP function: During network communication, the application of the source host knows the IP address and port number of the target host, but do not know the hardware address of the target host. The packet is first received by the network adapter and then processed by the upper-layer protocol. If the hardware address of the received data packet does not match that of th

This section learns how to obtain the ARP protocol package and parse the ARP data. Before analyzing, first look at the message format of ARP The image above is the format of ARP request and reply message, which is explained in detail below. For the Ethernet header: If the request

ARP attacks often occur. What should I do if I encounter these problems? Please refer to the solution provided by the author below! Some time ago, some users often complained that the Internet was interrupted and sometimes even prompted that the connection was limited, and the IP address could not be obtained at all (our Organization uses a dynamic IP address ). The switch cannot be pinged, but the indicator is normal. After the vswitch is restarted,

Source: Http://www.hacker57.cn/article.asp? Id = 252 Friends who suffer from ARP attacks and Trojan-related web page automatic downloading Trojans come to see that the trojan is so powerful as a tiger. This sentence is used by current Internet users (including old cainiao like me) the body is really more appropriate, often found that a program will automatically download viruses and Trojans, but helpless, or often encounter

-FF), then, the packet will be received, and if not, the NIC will discard it directly. However, there is a premise that the NIC of the computer on the receiving end works in normal mode. If the NIC is set to the hybrid mode, it can receive all the packets that pass through (including, of course, packets whose destination is not local ). That is to say, as long as the packet is sent to the LAN, it will be received by the NIC in the mixed mode! This is the basic principle of sniffer. As for the sp

Under normal circumstances, as long as there is a route to a machine, no matter which network card address the service listens to, or from which network card the request enters, as long as the target IP address of the request is an IP address of the machine, the connection will be successful, of course, you can set a policy route or the destination address blocked by the multi-Table route table item is not configured when the data enters the NIC.Instance:R has two NICs, each of which is configur

Address: http://zjhwin.blog.51cto.com/202290/36201 Recently, a large-scale outbreak of ARP virus and its variants nationwide. If many computers are found to be poisoned in the LAN, ARP spoofing packets will be sent to all computers in the same network segment after computer poisoning, when a trojan program with ARP spoofing occurs, a large number of packets are s