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linux: disable using loopback and send data via wire between 2 eth cards of one comp [closed]

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问题 Closed. This question is off-topic. It is not currently accepting answers. Want to improve this question? Update the question so it's on-topic for Stack Overflow. Closed 6 years ago . I have a comp with 2 eth cards, connected with patch-cord (direct eth. cable from 1st to 2nd). The linux is installed, I want to send data from 1st network card to 2nd. And I want to force the packet to pass via cable. I can set up any ip on cards. With ping I get counters on cards constant. Is it possible with

Linux Loopback performance with TCP_NODELAY enabled

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问题 I recently stumbled on an interesting TCP performance issue while running some performance tests that compared network performance versus loopback performance. In my case the network performance exceeded the loopback performance (1Gig network, same subnet). In the case I am dealing latencies are crucial, so TCP_NODELAY is enabled. The best theory that we have come up with is that TCP congestion control is holding up packets. We did some packet analysis and we can definitely see that packets

Loopback 4: Upload multipart/form-data via POST method

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问题 I'm working in Loopback 4 and getting stuck in creating a POST method so that client can call this method and upload a multipart/form-data. I read some examples: https://medium.com/@jackrobertscott/upload-files-to-aws-s3-in-loopback-29a3f01119f4 https://github.com/strongloop/loopback-example-storage But, look like they are not suitable for Loopback 4. Could you help me to upload multipart/form-data via POST method in Loopback4. 回答1: Support for multipart/form-data was added to LoopBack 4

Win32 sockets - Forcing ip packets to leave physical interfaces when sending to other local interfaces

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问题 Summary: I'm trying to create sockets to pass data between two physical interfaces that exist on the same machine, and Win32 sockets always forwards the traffic directly in the kernel instead of pushing through the physical interfaces. Is there any way to disable this behavior, perhaps through device settings, registry tweaks, routing table shenanigans, or socket options? We're using Windows XP SP3. Some background. I'm attempting to build some completely automated IP tests to exercise our

K8s 从懵圈到熟练 – 集群网络详解

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【推荐】2019 Java 开发者跳槽指南.pdf(吐血整理) >>> 作者 | 声东阿里云售后技术专家导读：阿里云 K8S 集群网络目前有两种方案：一种是 flannel 方案；另外一种是基于 calico 和弹性网卡 eni 的 terway 方案。Terway 和 flannel 类似，不同的地方在于 terway 支持 Pod 弹性网卡，以及 NetworkPolicy 功能。本文中，作者基于当前的 1.12.6 版本，以 flannel 为例，深入分析阿里云 K8S 集群网络的实现方法。鸟瞰总体上来说，阿里云 K8S 集群网络配置完成之后，如下图所示：包括集群 CIDR、VPC 路由表、节点网络、节点的 podCIDR、节点上的虚拟网桥 cni0、连接 Pod 和网桥的 veth 等部分。类似的图大家可能在很多文章中都看过，但因为其中相关配置过于复杂，比较难理解。这里我们可以看下这些配置背后的逻辑。基本上我们可以把这些配置分三种情况来理解：集群配置，节点配置以及 Pod 配置。与这三种情况对应的，其实是对集群网络 IP 段的三次划分：首先是集群 CIDR，接着是为每个节点分配 podCIDR（即集群 CIDR 的子网段），最后在 podCIDR 里为每个 Pod 分配自己的 IP。集群网络搭建初始阶段集群的创建，基于云资源 VPC 和 ECS，在创建完

Docker网络管理（容器间通信）

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一、前言由于docker技术的火爆，导致现在越来越多的企业都在使用docker这种虚拟化技术。企业中使用docker这种虚拟化技术，其目的就是为了让docker中的容器对外提供服务。因此，我们必须深入了解一下docker的网络知识，以满足更高的网络需求。二、Docker的原生网络当你安装Docker时，它会自动创建三个网络。如下： [root@localhost ~]# docker network ls //查看docker的默认网络 NETWORK ID NAME DRIVER SCOPE a38bd52b4cec bridge bridge local 624b3ba70637 host host local 62f80646f707 none null local Docker内置这三个网络，运行容器时，你可以使用该“--network”选项来指定容器应连接到哪些网络。如果没有指定则默认使用bridge模式。比如： host模式：使用 --net=host 指定； none模式：使用 --net=none 指定； bridge模式：使用 --net=bridge 指定（默认设置）；下面详细介绍一下这几种网络模式：虽然docker模式提供三种网络模式，但其实是有四种网络模式的！ 1.host模式如果启动容器的时候使用host模式

accessing current logged in user id in custom route in loopback

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问题 I am trying to access the currently logged in user in a custom route using context.options but find it blank. Trying to access in a operational hook 'before save' like this: 'use strict'; module.exports = function (logs) { logs.observe('before save', async (ctx, next) => { console.log(ctx.options) //this is empty i.e {} }); Here is my custom route (boot script - routes.js): app.get('/logs/dl',(req,res)=>{ logs.create(logs,(err,obj)=>{ if(!err) { res.status(200); res.send(obj); } else { res

Loopback 4 test configurations are not picked up

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问题 I followed Loopback4 datasources documentation and placed sample.datasource.json and sample.test.datasource.json files under src/datasources . Whenever I run npm run test my repository is injected with original datasource but not the test datasource. My datasource configuration file sample.datasource.json is { "name": "sample", "connector": "postgresql", "url": "postgres://postgres:user@localhost:5432/somedb", "host": "localhost", "port": 5432, "user": "postgres", "password": "****",

Loopback post method call

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问题 I want to send a post request with loopback "invokeStaticMethod". Please help me how to do it. I want to send a POST API request to below url: localhost:3000/api/user/id/unblock With parameter {"userId", "blockId"} Please let me know how can I send a POST request with Loopback 回答1: You could create a remote method like this: User.unblock = function(id, userId, blockId, callback) { var result; // TODO callback(null, result); }; Then, the remote method definition in the json file could look

Where to place images and other components folder in loopback?

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问题 I want to add blog images and documents specific folder and get access to files in project, where should i make this folders and how can access in front end? I've tested images folder on common, server and project root folder but I couldn't access by something like : http://localhost:3000/logo.jpg or http://localhost:3000/images/logo.jpg 回答1: As mentioned here in the docs you should use storage component. you may define a data source targeting your local file system and should set the