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the address type to be converted, and 0x0800 is the IP address, the length of the following two addresses is 6 and 4 (bytes) for the ethernet address and IP address respectively. The op field is 1, indicating the ARP request, and the OP field is 2, indicating the ARP response. The process of the Address Resolution Protocol is as follows: Iv. RARP (Reverse Address Resolution Protocol) The opposite of ARP
The network and Protocol transport layers in the TCP/IP model define two end-to-end protocols: TCP and UDP. TCP (Transmission Control Protocol) Transmission Control Protocol, which divides the input byte stream into packet segments and sends them to the Internet layer.
Port concept: in network technology, Port has two meanings: one is physical Port, for example, ADSL Modem, Hub, switch, router is used to connect interfaces of other network equipment, such as RJ-45 port, SC port and so on. The second is the logical port, which generally refers to the port in the TCP/IP protocol. The port number ranges from 0 to 65535, for example, port 80 used to browse Web Services, port
Hierarchy name function Agreement Application tier (Application layer) Responsible for implementing all application-related functions, corresponding to the upper three layers of the OSI reference Model FTP (File Transfer Protocol) HTTP (Hypertext Transfer Protocol) DNS (domain Name Server protocol) SMTP (Simple Mail Transfer Protocol) NFS (Network File System protocol) The Transport layer (Transport layer) Responsible for providing reliable
command at the command prompt:Netdiag/test: ipsecIf you have specified a policy, you will receive a message similar to the following:IP Security test ......: PassedLocal IPSec Policy Active: Block UDP 1434 Filter3. if you have specified an IPSec Policy for a computer (local or domain, use the following syntax to add other BLOCK filtering rules to an existing IPSec Policy (the existing IPSec Policy Name, protocol, and port number are variables ):Ipsecpol-p "existing IPSec Policy Name"-w REG-r "B
e-mail protocol has SMTP, POP2, POP3, IMAP4, etc., are subordinate to the TCP/IP protocol cluster, by default, the connection is established through TCP ports 25, 110 and 143 respectively. For different purposes and functions, we will adjust the mail server settings to suit your needs.Yesterday Foxmail suddenly broke d
CentOS commands for viewing IP addresses, modifying IP addresses on ports, and activating ports You know, you get used to ipconfig in windows, and it is a lot of trouble to view IP addresses in CentOS; The information collected today focuses on
Applications Application layer Protocol Transport Layer protocol name conversion dns UDP File Transfer tftp UDP Route Selection Protocol rip UDP IP address configuration NBSP;NBSP;NBSP;NBSP;NBSP;NBSP;NBSP;NBSP;NBSP;NBSP;NBSP;BOOTP ,dhcp UDP Network Management snmp UDP Remote file server nfs NBSP;NBSP;NBSP;NBSP;NBSP;NBSP;UDP IP Phone Proprietary Protoco
You know that ipconfig is used to in windows, and it is a lot of trouble to view IP addresses in CentOS. The information collected today focuses on IP port problems: View IPifconfigeth0 rarr; check the IP address, but the output information is more ifconfig | grep #39; Bcast #39; rarr; the output information should be clear and the
Find the service name with the specified port and protocol if you want to find a network service, it is best to know which port the service is running on TCP or UDP protocol. If you know the port that the Network service uses, you can call the Getservbyport () function in the socket library to get the name of the service.Technical Point decomposition:1, define the Find_service_name () function, note the code indentation in the function2, Getservbyport
Protocols and ports used by Windows Server Failover ClusterThe Windows server Cluster service, the Cluster service, is used to control server cluster operations and to manage the internal flat file database of the cluster. A cluster is a collection of standalone servers that are combined and serve as a separate entity for external service. The cluster that the user sees is a separate system. If a node fails
remaining data segment. B sends A FIN data segment to A, and A returns the confirmation message, and the connection is closed. UDP: No connection Transfer Protocol-- UDP has a limited error check function and cannot re-Sort data. The connectionless design makes it the protocol used by network broadcast. The UDP header contains four 16-bit fields: Source Port, target port, length, and checksum. Other transport layer protocols: Datagram congestion co
Author: vamei Source: http://www.cnblogs.com/vamei welcome reprint, please also keep this statement. Thank you! Network Layer)It is the most important layer to implement the internet. At the network layer, each LAN is connected to each other based on the IP protocol and eventually forms a global Internet. Higher-level protocols, whether TCP or UDP, must pass
Edit/etc/sysconfig/iptables, add- s 127.0.0.1 --dport 6379-J Accept-s 126.212.173.185 --dport 6379-j ACCEPTThe above add red place is only to the local and 126.212.173.185 open 6379 port, other IP with Telnet is not connected,If there is no limit to access IP, you do not need to add the- s IP address , for example-A input-m state--state new-m
and termination of the connection between network devices. The SPX protocol is the auxiliary protocol of IPX, which mainly realizes the grouping of information, tracking packet transmission and guaranteeing the intact transmission of information. The IPX protocol is responsible for the transmission of the packet, and the SPX is responsible for the integrity of the packet transmission.File sharing between Linux systems and Liunx files sharing with Windows systems: IBM SMB, Server Information blo
The OSI seven-layer model is a standard system and framework for interconnection between different computers or communication systems, including a range of standards and protocols in OSI, such as TCP/IP, UDP, HTTP, and so on, which provide implementation and support for these protocols in Node.js, such as: NET modules
Introduction to tcp protocol (TCP/IP) and TCP/IP Role of the transport layer: the IP layer provides point-to-point connections, and the transport layer provides end-to-end connections. Transport Layer Protocol 1.
Two types of transport protocols: TCP,UDPTCPTCP is the short name of Transfer Control Protocol , which is a connection-oriented protocol that guarantees reliable transmission .In the TCP/IP protocol,IP layer is mainly responsible for the location of the network host, the rou
Reprint Address: http://blog.jobbole.com/84429/TCP HTTP UDP:is the communication protocol, that is, the rules of communication, only the two parties in accordance with this rule "speak", the other party can understand or serve.The relationship between TCP HTTP UDP three:TCP/IP is a protocol group, which can be divided into four levels: network interface layer, ne
"Original" https://www.toutiao.com/i6592813624689951239/ Overview⊙TCP/IP is a protocol group that can be divided into three levels: Network layer, Transport layer and application layer.At the network layer are IP protocols, ICMP protocols, ARP
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