tcp/ip协议分析_第4页-阿里云

tcprstat源码分析之tcp数据包分析

tcprstat是percona用来监测mysql响应时间的。不过对于任何运行在TCP协议上的响应时间，都可以用。本文主要做源码分析，如何使用tcprstat请大家查看博文《tcprstat分析服务的响应速度利器》 tcprstat和tcpdump一样，使用libpcap库进行抓包，然后再通过程序对...

netstat统计的tcp连接数与⁄proc⁄pid⁄fd下socket类型fd数量不一致的分析

新blog地址： http://hengyunabc.github.io/netstat-difference-proc-fd-socket-stat/ 最近，线上一个应用，发现socket数缓慢增长，并且不回收，超过警告线之后，被运维监控自动重启了。首先到zabbix上观察JVM历史记录，发现J...

TCP/IP之TCP连接的建立与中止状态分析

　　TCP连接的建立可以简单的称为三次握手，而连接的中止则可以叫做四次握手。 1、连接的建立：　　　　c端发起请求同步（用SYN段等于1的TCP报文），确认某个端口是否监听；　　　　s端应答（用ACK段等于1的TCP报文），　　　　c端收到s端的ACK，并回应s端一个ACK给s端；经过上面三...

TCP连接状态分析:SYNC_RECV,CLOSE_WAIT,TIME_WAIT

netstat -n | awk '/^tcp/ {++S[$NF]} END {for(a in S) print a, S[a]}'  结果：除了ESTABLISHED，可以看到连接数比较多的几个状态是：FIN_WAIT1, TIME_WAIT, CLOSE_WAIT, SYN_RE...

Linux TCP/IP 协议栈之 Socket的实现分析(Connect客户端发起连接请求)

sys_connect对于客户端来说，当创建了一个套接字后，就可以连接它了。 case SYS_CONNECT: &n...

Linux TCP/IP协议栈之Socket的实现分析(Accept 接受一个连接)

Tcp栈的三次握手简述进一步的分析，都是以 tcp 协议为例，因为 udp要相对简单得多，分析完 tcp，udp的基本已经被覆盖了。这里主要是分析 socket，但是因为它将与 tcp/udp传输层交互，所以不可避免地接触到这一层面的代码，这里只是摘取其主要流程的一些代码片段，以更好地...

Linux TCP/IP协议栈之Socket的实现分析(socket listen)

sys_listen对面向连接的协议，在调用 bind(2)后，进一步调用 listen(2)，让套接字进入监听状态： int listen(int sockfd, int backlog);backlog 表示新建连接请求时，最大的未处理的积压请求数。这里说到让套接字进入某种状态，也...

Linux TCP/IP协议栈之Socket的实现分析(socket bind)

当创建了一个Socket 套接字后，对于服务器来说，接下来的工作，就是调用 bind(2)为服务器指明本地址、协议端口号，常常可以看到这样的代码:strut sockaddr_in sin; sin.sin_family = AF_INET; sin.sin_addr.s_addr = ...

Linux TCP/IP 协议栈之 Socket的实现分析(数据包的接收)

前面了解过 sk 有一个接收队列，用于存储接收到的 skb，对于 socket 层面上来讲，数据接收，就是要把数据从这个队列中取出来，交给上层用户态。这里涉及到出队操作，但是，要了解如何出队，就得了解传输层协议如何入队。前面一直用 tcp协议来分...

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更新时间 2023-01-08 17:43:08

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