network-protocols | 易学教程

Is Stream.Read buffered when doing network I/O?

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问题 So I was recently doing some work, when somebody told me that if doing a Stream.Read on a network stream that is obtained from calling one of .NET's GetResponseStream on a WebResponse or those are buffered. He was saying that if you were to put a breakpoint, in the code where you're reading, you wouldn't stop the network traffic. I find that bizzare, but also hoping that it's true. How does that work? Is it even accurate? using (Stream webResponseStream = this.webResponse.GetResponseStream())

How does the Bittorrent protocol handle the data chunks?

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问题 How are the data chunks handled within the bittorrent protocol? When a client wants to download e.g. a linux distribution does the tracker return a list of peers which a client then connects to and requests chunks from each peer or does the tracker return a list of peers and info of which peer has what data? Where is the data chunks managed or handled e.g. I need chunk 5 , 6, 10 and peer 2 has chunk 5, 7, 8. where is the data controlled or managed? Does the client request chunks from the

What open ports are required on firewall to allow for salt-stack remote execution?

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问题 The documentation on saltstack appears to be unclear regarding what ports are required from the salt-master -> salt-minion (apparently none are required). It suggests that ports only need to be opened from the salt-minion -> salt-master. (See: http://docs.saltstack.com/en/latest/topics/tutorials/firewall.html) If however commands are executed remotely on the salt-master targeted to a minion, surely the master needs to be able to push this into the minion and therefore require a network

Script to find all network adapters I'm connected to in Python

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I have a laptop that is connected to my organization's network using one or more network adapters. I'm not sure how to start this or where I should look for native python methods or other resources. I was wondering how can I discover all the network adapters or NICs I am connected to using python. I want to try to accomplish this without a 3rd party library but if I have to that is fine as well. I ultimately want to be able to write a tool that will continuously monitor the connectivity status and connection quality of each network. However I first have to find out which and how many network

Difference between Internal IP Address and External IP Address

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问题 Can anyone tell me what is difference between Internal IP Address and External IP Address? How to get both in any programming language like Java, C# or Adobe AIR? 回答1: Internal IP address is the address from your network: IPHostEntry heserver = Dns.GetHostEntry(Dns.GetHostName()); IPAddress curAdd = heserver.AddressList[0]; curAdd.ToString(); Your external IP address is the address from your ISP string ip = new System.Net.WebClient() .DownloadString(("http://www.whatismyip.com/automation

TDD on client-server application

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Currently I'm creating a server application to receive protocol-specific messages. I need to create tests to ensure that I've implemented the protocol correctly. Is this some kind of integration testing? If positive, can I make an integration testing with unit testing tools? And finally, what is the best way to create these kind of tests? If you know what the correct responses are, then here's what I'd do: Separate the class responsible for the logic of handling the protocol from the code dealing with the mechanics of the connection. Write tests, one at a time, specifying the correct response

linux support 802.1ag and Y1731

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问题 What I need to do is to use CFM OAM (802.1ag) open source client on OpenWRT routers running linux Is there is any implementation in Linux networking stack for 802.1ag ? Y1731 ? If yes please mention the linux version. 来源： https://stackoverflow.com/questions/12568284/linux-support-802-1ag-and-y1731

Android phone development - UDP services

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问题 I'm interested in the viability of implementing an Android application that interacts with a UDP service. I'm sure Android supports UDP: http://www.helloandroid.com/tutorials/simple-udp-communication-example What I'm less clear about is whether or not such an application would actually work on an Android phone on a typical tariff - for bidirectional communication. I want the Android client to contact a remotely hosted service by UDP (announcing itself) and for the server to subsequently

Efficient decoding of binary and text structures (packets)

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问题 Background There is a well-known tool called Wireshark. I've been using it for ages. It is great, but performance is the problem. Common usage scenario includes several data preparation steps in order to extract a data subset to be analyzed later. Without that step it takes minutes to do filtering (with big traces Wireshark is next to unusable). The actual idea is to create a better solution, fast, parallel and efficient, to be used as a data aggregator/storage. Requirements The actual

does protobuf need a network packet header?

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问题 I am using 'protobuf' for C/S network program using TCP. here is my steps for client: 1, pack data into a 'protobuf' 2, get size in bytes of the pack and construct a length-prefix frame 3, write the frame+pack to socket and then the server: 1, read Length-prefix frame from socket and get the length N 2, read N bytes from socket and fill the data into protobuf instance 3, get "value"s from protobuf by "key"s it seems a little complicated I think, is there some kind of auto-generated length