tcp四次挥手是超经典的网络知识，但是网络中的异常状况千奇百怪，说不定会“偷袭”到标准流程的盲区。最近笔者遇到了一个罕见的挥手乱序问题，经过对内核代码的分析和试验，最后终于找到了原因，角度可谓刁钻。 本文从技术视角，将排查过程记录下来 ...

注意：本文只探讨技术，请勿用于非法用途，否则后果自负。 TCP协议是 TCP/IP 协议栈中一个重要的协议，平时我们使用的浏览器，APP等大多使用 TCP 协议通讯的，可见 TCP 协议在网络中扮演的角色是多么的重要。 TCP 协议是一个可靠的、面向连接的流协议，由于 TCP ...

TCP的经典异常问题无非就是丢包和连接中断，在这里我打算与各位聊一聊TCP的RST到底是什么？现网中的RST问题有哪些模样？我们如何去应对、解决？本文将从RST原理、排查手段、现网痛难点案例三个板块自上而下带给读者一套完整的分析。 一、背景 最近一年的 ...

TCP 的三次握手和四次挥手，可以说是老生常谈的经典问题了，通常也作为各大公司常见的面试考题，具有一定的水平区分度。看似是简单的面试问题，如果你的回答不符合面试官期待的水准，有可能就直接凉凉了。 本文会围绕，三次握手和四次挥手相关的一些 ...

Most network people understand the terrible effect delay can have on TCP sessions. TCP must pause data transfers while waiting for ACKs. The more network delay there is, the longer this pause will be.

For a class project I had to code an TCP/UDP echo client and server and then capture the resulting packets using TCPDUMP. Here is the output for sending 1000 characters (1000 bytes) from a file from ...

I am having some odd download speeds that vary from device to device. I believe the problem is with the wifi network we use but can't pinpoint why. 1) With 4 different iPhones the download speed of a ...

Take advantage of TCP/IP options to optimize data transmission Your email has been sent By Alex Kuznetsov, Alex Plant, and Alexander Tormasov Last time, we explained how the TCP_CORK option can ...

Transmission Control is an essential aspect of network activity and governs the behavior of many services we take for granted. When sending your emails or just browsing the web you are relying on TCP ...

While the world grapples with the ongoing effects of the COVID-19 pandemic, enterprises continue to be bombarded with cyberattacks. Many cybersecurity companies rely on devices such as firewalls, ...