internet message protocol

ICMP is (Internet Control message Protocol) Internet controlled message protocol. It is a sub-protocol of the TCP/IP protocol family that i

ping uses an ICMP echo request and a loopback reply message; Ping is an example of the use of the network layer ICMP directly by the application layer;(2) Another very useful application is traceroute: used to track a packet from the source to the end of the path; Traceroute sends a series of IP datagrams from the source host to the destination, and the datagram encapsulates the undelivered UDP user data; The time-to-live TTL of the first datagram is

generated the error message (including any options), and must include at least the first 8 bytes following the IP header. In our example, the first 8 bytes following the IP header contain the header of the UDP.The IP header is included because ICMP knows which protocol uses IP, and then knows how to interpret the 8 bytes that follow. The content contained in the UDP header is the source port number and the

The way the internet pushes messages is very common, especially mobile Internet, mobile phone can receive a lot of push message every day, after research found that the principle of these push service is to maintain a long connection (or can not achieve real-time effect), but the normal socket connection to the server consumption is too large, So there's a lightw

ICMP: Internet Control Message Protocol. The network layer of the Internet consists of the IP protocol, the routing protocol (RIP, OSPF, BGP), and ICMP. ICMP is used to exchange messages between the host and the route. The most ty

ICMP Port unreachable authentication. 1. Preparationwindow to download the TFTP32 software and set the IP address of the server (window system IP ), and shut down windows firewall. As shown in the following:2,Ubuntu virtual machine, install tftp service, and install wireshark.sudo apt-get install TFTP3.Open Wireshark.Start the TFTP service and connect to window, Specify the 8000 port, this port number is not process in use , when need get file, Eventually , the port is unreachable and the time

Label:IMAP (Internet Mail access protocol,internet) is formerly known as the Interactive Mail Access Protocol (Interactive mail, Access Protocol). IMAP was an email acquisition protocol developed by Stanford University in 1986. It

Internet Protocol Summary, Internet Protocol Today, I saw an article on network protocol on my way to work. I think it's a good job to write. Well, of course I want to keep some good stuff. I 'd like to share it with you here! This article is reproduced in the network log of

One, the distinction between communication and communication protocol:1, the traditional meaning of "communication" mainly refers to telephone, telegraph, telex. The "message" of the communication means the messages, and the media messages are passed from one end to the other through the communication network. The content of media message is mainly voice, text, p

these protocols.For example, we use the HTTP protocol, FTP protocol for file transmission, SMTP for email sending, DNS protocol for domain name resolution, and Telnet protocol for remote login for WWW access, all belong to the TCP/IP application layer. In terms of users, most of the graphic operation interfaces built

What is the industrial Internet of things?In short, it is the specific application of the Internet of things in industrial control.What is SSL/TLS?SSL (secure Sockets layer Secure socket), and its successor Transport Layer Security (Transport layer Security,tls) is a security protocol that provides security and data integrity for network traffic. TLS encrypts the

Delayed Internet conversation: Channel Management(Rfc2811-Internet Relay Chat: client Protocol)Status of this memoThis Memorandum provides information to internet groups. It does not set any Internet standards and can be released without restrictions.Copyright NoticeCopyrigh

Communication Protocol for TCP/IP Internet (Internet) I. TCP/IP is used for Internet (Internet) communication Protocol 1. Computer Communication Protocol is a description of the rules t

HTTP protocol details-what is the http protocol and http message structure? HTTP protocol details-what is the http protocol and http message structure ., The development technology of today's web programs is truly a battle, ASP. N

PPPoE (point-to-point over Ethernet, allows the Ethernet host to connect to an unwarranted access concentrator via a simple bridging device [3]) dial-up Internet, The Ppop header is 8 bytes, so the MTU of PPPoE is 1492,MSS and 1492-40=1452.So, what is the MSS for data transfer after TCP connection is established, 1460 or 1452 or 536? My understanding is the default value of 536, so to understand it? Ask for advice!3.4 Third HandshakeClient again the

1. IntroductionIP is the most central protocol in the family of TCP/IP protocols. All TCP, UDP, ICMP, and IGMP data are transmitted in an IP datagram format. IP provides unreliable, non-connected datagram delivery services.(1) unreliableIt does not guarantee that IP datagrams will successfully reach their destination. IP only provides the best transport service. In the event of an error, such as a router temporarily running out of buffers, IP has a si

7.1 Introduction Internet Protocol (PROTOCOL,IP) is the transport mechanism used by the TCP/IP protocol cluster at the network layer. IP is an unreliable non-connected datagram Protocol-the best effort to deliver (best-effort delivery) services.7.2 Data Report The grouping

Internet Layer Protocol FeaturesRunning on the OSI network layerNon-connection oriented protocolProcessing data packets independentlyLayered addressingBest effort transferNo Data recovery functionThe Internet layer mainly contains IP, ICMP, ARP, rarp several protocols.This is a major IP protocol.IP PDU HeaderFirst line: 4bit identifies the

the Thunder (dedicated download link) protocol. (Representative software: Thunderbolt) format thunder://News accesses the resource through NNTP.Tencent by supporting Tencent (dedicated chat connection) protocol and user conversations. (on behalf of the software: QQ, TM) format tencent://message/?uin= number site=menu=yesMsnim by supporting Msnim (dedicated chat