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  • An option to have inter-container communications via TCP/IP would be very useful. Or at least a unified config file where inter-container comms are defined. At the moment, modification of multiple ...
  • TCP/IP详解学习笔记(1)-基本概念 原创 2006年04月15日 23:48:00 <ul class="article_tags clearfix csdn-track

    为什么会有TCP/IP协议

    在世界上各地,各种各样的电脑运行着各自不同的操作系统为大家服务,这些电脑在表达同一种信息的时候所使用的方法是千差万别。就好像圣经中上帝打乱了各地人的口音,让他们无法合作一样。计算机使用者意识到,计算机只是单兵作战并不会发挥太大的作用。只有把它们联合起来,电脑才会发挥出它最大的潜力。于是人们就想方设法的用电线把电脑连接到了一起。

    但是简单的连到一起是远远不够的,就好像语言不同的两个人互相见了面,完全不能交流信息。因而他们需要定义一些共通的东西来进行交流,TCP/IP就是为此而生。TCP/IP不是一个协议,而是一个协议族的统称。里面包括了IP协议,IMCP协议,TCP协议,以及我们更加熟悉的http、ftp、pop3协议等等。电脑有了这些,就好像学会了外语一样,就可以和其他的计算机终端做自由的交流了。

    TCP/IP协议分层

    提到协议分层,我们很容易联想到ISO-OSI的七层协议经典架构,但是TCP/IP协议族的结构则稍有不同。如图所示

    TCP/IP协议族按照层次由上到下,层层包装。最上面的就是应用层了,这里面有http,ftp,等等我们熟悉的协议。而第二层则是传输层,著名的TCP和UDP协议就在这个层次(不要告诉我你没用过udp玩星际)。第三层是网络层,IP协议就在这里,它负责对数据加上IP地址和其他的数据(后面会讲到)以确定传输的目标。第四层是叫数据链路层,这个层次为待传送的数据加入一个以太网协议头,并进行CRC编码,为最后的数据传输做准备。再往下则是硬件层次了,负责网络的传输,这个层次的定义包括网线的制式,网卡的定义等等(这些我们就不用关心了,我们也不做网卡),所以有些书并不把这个层次放在tcp/ip协议族里面,因为它几乎和tcp/ip协议的编写者没有任何的关系。发送协议的主机从上自下将数据按照协议封装,而接收数据的主机则按照协议从得到的数据包解开,最后拿到需要的数据。这种结构非常有栈的味道,所以某些文章也把tcp/ip协议族称为tcp/ip协议栈。

    一些基本的常识

    在学习协议之前,我们应该具备一些基本知识。



    • 互联网地址(ip地址)


      网络上每一个节点都必须有一个独立的Internet地址(也叫做IP地址)。现在,通常使用的IP地址是一个32bit的数字,也就是我们常说的IPv4标准,这32bit的数字分成四组,也就是常见的255.255.255.255的样式。IPv4标准上,地址被分为五类,我们常用的是B类地址。具体的分类请参考其他文档。需要注意的是IP地址是网络号+主机号的组合,这非常重要。



    • 域名系统


      域名系统是一个分布的数据库,它提供将主机名(就是网址啦)转换成IP地址的服务。



    • RFC


      RFC是什么?RFC就是tcp/ip协议的标准文档,在这里我们可以看到RFC那长长的定义列表,现在它一共有4000多个协议的定义,当然,我们所要学习的,也就是那么十几个协议而已。



    • 端口号(port)


      注意,这个号码是用在TCP,UDP上的一个逻辑号码,并不是一个硬件端口,我们平时说把某某端口封掉了,也只是在IP层次把带有这个号码的IP包给过滤掉了而已。



    • 应用编程接口


      现在常用的编程接口有socket和TLI。而前面的有时候也叫做“Berkeley socket”,可见Berkeley对于网络的发展有多大的贡献。



    展开全文
  • s not ready to be merged yet, but I wanted to open this to track progress. </p> <p><strong>Send statement:</strong></p> <pre><code>SEND <TEXT-EXPR> TO <TEXT-EXPR> AT <NUMBER-EXPR> IN...
  • TCP/UDP Stuttering

    2020-12-05 12:30:53
    <p>Near real-time communication with a Linux computer (Ubuntu 16.04 LTS) using either UDP or TCP.</p> <p>This is also happening at the same time the Argon board is running multiple threads to get data...
  • [490869] [MQTT] Sending /NodeMCUBedroom/ip => 192.168.0.241 (PID 8) [490875] [MQTT] Sending /NodeMCUBedroom/mac => 68:C6:3A:84:1C:1E (PID 9) [490881] [MQTT] Sending /NodeMCUBedroom/rssi ...
  • Network interfaces (IPs, bandwidth in/out), network parameters, TCP/UDP statistics Battery state (% capacity, time remaining, power usage stats) USB Devices Connected displays (with EDID info), ...
  • TCP connection is received by the server The connection is wrapped inside Request object When the request head is received (type, url, get params, http version and host), the server goes through all ...
  • NAME TYPE CLUSTER-IP EXTERNAL-IP PORT(S) AGE hello ClusterIP 10.98.191.2 <none> 80/TCP 34s kubernetes ClusterIP 10.96.0.1 <none> 443/TCP 118s $ kubectl apply -f ...
  • simple port scans may cause conflict with the local TCP/IP stack. This means you need to use either the --src-ip option to run from a different IP address, or use --src-port to configure which source ...
  • - proxy_tcp_udp_multi_port_handling - network_state - proxy_unix_dac_properties - container_protection_delete - unix_priv_drop - pprof_http - proxy_haproxy_protocol - network_hwaddr - proxy_nat - ...
  • v3.0, 2020-02-21, For #1598, support SLB health checking by TCP. 3.0.123 v3.0, 2020-02-21, Fix bug for librtmp client ipv4/ipv6 socket. 3.0.122 v3.0, 2020-02-18, For #1579, support start/final wait ...
  • if you share an IP address with many other users (e.g. in an office), you may get rate limited by their API, and Docker Machine will error out with messages indicating this. In order to work around ...
  • Concurrency/load issues

    2020-12-27 07:15:00
    # Add X-Request-Start header so we can track queue times in New Relic RPM beginning at Varnish. #if (req.restarts == 0) { C{ /*struct timeval detail_time; gettimeofday(&detail_time,...
  • reactor.listenTCP(8000, factory) reactor.run() WSGI To use Prometheus with WSGI, there is make_wsgi_app which creates a WSGI application. from prometheus_client import make_wsgi_app from wsgiref....
  • track=stable Annotations: kubernetes.io/psp: eks.privileged Status: Pending IP: IPs: <none> Controlled By: ReplicaSet/windows-server-iis-66bf9745b Containers: windows-server-iis: Image: ...
  • <div><h3>Package and Environment Details</h3> <ul><li>Package Name/Version: <strong>pulseaudio/13.0</strong></li><li>Operating System+version: <strong>Linux CentOS 8</strong></li><li>Compiler+...
  • tcp-request connection track-sc0 src tcp-request connection reject if { sc0_get_gpc0 gt 0 } ... use_backend http_dynamic if { path_end .php }</p> <p>backend http_dynamic # if a source makes too ...
  • <p>It would be far simpler for the application developer if the system itself kept track of the source/target binding for each socket and reinstated that when the network interface it's bound to ...
  • track_interface { eth0 } virtual_ipaddress { 192.168.10.100 } } # Service: default/rc-ngx virtual_server 192.168.10.100 443 { delay_loop 5 lvs_sched wlc lvs_method NAT persistence_timeout...
  • acl wl src -f /etc/haproxy/ip_whitelist.lst acl acl_xxx src x.x.x.x/24 x.x.x.x/27 x.x.x.x/24 acl ajax_url path_beg /ajax.php acl xpromo urlp(class) -i crosspromo acl abuse_ua hdr_sub(user-agent) ...
  • Rack::Protection::IPSpoofing:0x000055696f19bcd8 =#<Rack::Protection::JsonCsrf:0x000055696f19bda0 =#<:protection::pathtraversal:0x000055696f19be68 :versions>"", :default_...
  • use TrafficStats.setThreadSocketTag() to track all network usage 02-13 15:17:14.389 16658 20706 E StrictMode: at android.os.StrictMode.onUntaggedSocket(StrictMode.java:2012) 02-13 15:17:14.389 16658 ...
  • Injecting additional redirects as suggested in the mailing list thread does not play super nicely with POST requests, would require me to track additional state and is cheaply handled on the client ...
  • checking netinet/tcp.h usability... yes checking netinet/tcp.h presence... yes checking for netinet/tcp.h... yes checking sys/ioctl.h usability... yes checking sys/ioctl.h presence... yes checking for...
  • rfc1349原版文档

    2014-09-09 11:01:52
    原版的文档,tcp/ip初学者必备内容This document specifies an IAB standards track protocol for the Internet community, and requests discussion and suggestions for improvements
  • 17/07/18 18:44:42 INFO client.TezClient: The url to track the Tez Session: http://ip-172-18-109-126.us-west-2.compute.internal:20888/proxy/application_1500403084622_0001/ 14588 [PigTezLauncher-0] INFO...
  • TCP/IP connections on port 5433? could not connect to server: Connection refused Is the server running on host "localhost" (127.0.0.1) and accepting TCP/IP connections on port 5433? </code>...
  • and not is_local_ip(self.ip): raise RuntimeError("Can only launch a kernel on a local interface. " "Make sure that the '*_address' attributes are " "configured properly...
  • libp2p:swarm:dialer dialSingle: QmYqacKLM4ST232aSRuTCVzvYxz1rA1mMhN3fAuRBBzzAN:/ip4/10.0.0.246/tcp/3000/ipfs/QmYqacKLM4ST232aSRuTCVzvYxz1rA1mMhN3fAuRBBzzAN +1ms</code></pre> <p>While the content...
  • - Model: IP8M-2496EB - Resolution: 4k - FPS: 5</p> <p><strong>Additional context</strong> I haven't ever had this working before, so it is possible or likely I am missing something obvious in ...

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