tcp supplement

#description:galaxycd/varfori in$ (Ls/var);doif[-f $i ];then echo "Commonfile." elif[-L $i ];thenecho "Symbolicfile ." elif[-d $i ];thenecho "DirectOry. " elseecho "Othertype" fidone method three:#!/bin/bash# version:0.0.8#author:lcc.org#description:adddirforiin$ ( Ls/var) doif[-f/var/$i ];thenecho "Commonfile" elif[ -l/var/$i ];thenecho "Symbolicfile" elif[-d/var/$i ]; thenecho "Directory" elseecho "Othertype" FidoneExample four: How many listen are in the establish State under the

Rvi0 is the remote virtual interface, which means that an iOS device interface is virtualized on your Mac, and then the packets on this interface are captured through tcpdump. sudo tcpdump -i rvi0 -n -s 0 -w dump.pcap tcp Explain the meanings of the preceding important parameters: -I rvi0: select the interface to be crawled as rvi0 (Remote Virtual Interface) -S 0: capture all data packets -W dump. pcap: Set the name of the saved file.

TCP three-time handshake: SYN------Syn+ack and ACKFour waves: fin-to-ack (FIN)--and ACKTCP 10 states: LISTEN syn_sent Syn_recv established fin_wait1 fin_wait2 close_wait last_ack time_wait CLOSEDMSL: Maximum message survival time4 times the handshake completes the connection close, the active close the connection one party after the 3rd time handshake completes sends the fourth time handshake the ACK packet to enter the TIME_WAIT state, must stay in t

Label:--Right (' A ' +cast (' B ' as nvarchar ()), C) Variable on the right A : The maximum length of the character to be replenished. For example: ' 0000 ' up to supplement 4 bit, insufficient Bit with 0 "AAAA" total 4 bit, less bit with A Add. B ： Variable C : string length after supplement Select ' CDMS ' +right (' 0000000 ' +cast (' 111 ' as nvarchar (50)), 7) DWBH-- Results: 0000111 Select ' CDMS

=" Wkiom1ehryjxwtklaac0rpvbq30948.png-wh_50 "/>14. Curl CommandCurl is a file transfer tool that works in command-line mode based on URL syntax, which supports protocols such as FTP, FTPS, HTTP, HTTPS, GOPHER, TELNET, DICT, file, and LDAP. Curl supports HTTPS authentication, and supports HTTP post, put and other methods, FTP upload, Kerberos authentication, HTTP upload, proxy server, cookies, username/password Authentication, download file breakpoint continuation, upload file breakpoint continua

corresponding to an IP address, you can find the corresponding address in the network Connection. Domain Name: localhost//represents a local. each domain name corresponds to an IP address. the domain name is good for ip.PORT/TCP protocol/socket programming/client, Server side, using socket step 1) to establish socket connection 2) get socket input/output stream. 3) Exchange communication using IO stream, 4) shutdown IO stream close socket connectionU

close, in this case, the occupied FD is not released, and the resource is leaked. This will also lead to a large number of CLOSE_WAIT statuses, so that when the FD is used up (the default value is 1024), accept will fail. (Note: here the CLOSE_WAIT status is caused by the application not calling close, and the system will not release the resource, that is, it will always exist) (Note: even if the accept fails, the link can still be established successfully, because for the underlying implementa

makes little sense to improve the TCP three-time handshake. such as timing issues. A common order is a causal order, but the causal order has a theoretical result until recently. For example, deadlocks do not have a practical way to deal with them perfectly.On deadlock--a discussion on theoretical computer scienceI simply think it's about the "entropy" thing. Not so complicated. Key in efficiency: the methods of dealing with deadlocks, such as deadlo

Install and configure tuxedo in Windows-database supplement Papayas 2006-5-28 I. Sequencing The document "install and configure tuxedo in Windows-Database" describes how to connect to the database through the Xa method, which involves many steps.Use another method to directly write commands to connect to the database in the service program. 2. server programs Minor modification Exec SQL begin declare section;Varchar ora_no [2];Varchar ora_value [10];V

) Conn_auth ( tcp_socket_client) while True: data=input (' >>: '). Strip () if not data:continue if data = = ' Quit ': Break Tcp_socket_client.sendall (Data.encode (' Utf-8 ')) respone=tcp_socket_client.recv (bufsize) Print (Respone.decode (' Utf-8 ')) tcp_socket_client.close () if __name__ = = ' __main__ ': ip_port= (' 127.0.0.1 ', 9999) bufsize=1024 Client_handler (ip_port,bufsize)Client (illegal: Do not know encryption method)#_ *_co

Principle of TCP/IP reliability Sliding Window congestion window and TCP Window TCP and UDP are on the same layer-transport layer, but the most difference between TCP and UDP is that TCP provides a reliable data transmission service, which is connection-oriented, that is, th

HTML Basics Supplement 1. Table Defined Instance Effect HTML Knowledge Supplement

Tags: mysql database centos shellThe source of this article: http://blog.csdn.net/u012377333/article/details/47006087 After the introduction of the CentOS-based MySQL learning Supplement two-using the shell to create a database, this article continues to explore the use of shell and MySQL together, I don't know how to quickly create a well-designed database table and add the appropriate basic data after a database design is complete, what I now know i

In fact, many friends often search for some information about 2003 will come to the cloud habitat community but the lack of a series of articles list, later we will be the topic of the way to organize, the following for you to share the security of Win2003 server settings considerations and procedures. First, the security of the server is generally divided into: System security settings, Web security (Web server and program), database security (low privilege run) First, server system security

Timeout retransmission is another important mechanism for TCP to ensure data reliability. Its principle is to enable a timer after a certain data is sent, if the ACK packet of the sent datagram is not received within a certain period of time, the data will be resent until the message is sent successfully.1. Timeout Timeout calculation is the core part of timeout. TCP requires this algorithm to roughly estim

About the scanf function supplement1 about "character" and "integer" Mixed input2 "integer" and "integer" Mixed inputTwo "integer" is written in one piece, must have For example: 1 and 1, if not split, it's 11.3 "After the project in actual combat, all separated by commas* When there are characters: scanf ("%d,%c,%d", a,ch,b); Input time: 23,a,3 print Out is: 3 A* No characters at the time: scanf ("%d%d%d", a,b,c); Input time:90C-language-scanf function supp