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83
votes
6answers
35k views

Difference between a socket and a port

Could someone please explain quite clearly the difference between a port and a socket. I know that a port serves as a door into the network for an application process and that the application process ...
14
votes
1answer
620 views

What did network programs use to communicate before sockets was invented (around 1983?)

Sockets were invented in Berkeley around 1983, but how did networked computer programs work before this? These days, pretty much everything uses sockets, so it's hard for me to imagine how else ...
11
votes
3answers
3k views

How to handle Real Time Data from a database perspective?

I have an idea in mind, but it still confuses me the database area. Imagine that I want to show real time data, and using one of the latest browser technologies (web sockets - even using older ...
10
votes
1answer
1k views

How do sockets work over wireless connections?

I've only worked on client side(specifically, mobile) applications using Android, where all networking is handled at the HTTP layer using framework provided components like HttpUrlConnection. But ...
10
votes
3answers
5k views

Is there an alternative to HTML Web Sockets, now that Firefox 4 has disabled them?

I've been checking out some of the latest multiplayer engines in HTML all supporting multi-user games (Very nice) - I believe all these engines use Web Sockets for communication. That’s why we’ve ...
9
votes
3answers
2k views

Simple explanation of the Unix sockets

I can search and I've already looked at the wikipedia entry and in some other places, but even though I have some programming experience, I don't really grasp the concept. Can you treat me like a 10 ...
8
votes
3answers
4k views

Difference between networking programming and socket programming

Are there any major differences when we talk about "socket programming" compared to "network programming"? Are there some topics that cover "network programming" but not "socket programming"?
7
votes
1answer
240 views

Does it ever make sense to read from and/or write to a bound, listening socket?

I'm experimenting a little with creating a socket server, in PHP. In doing so I'm trying to abstract away the kinds of sockets I think I'll be needing, that I've tentitively named: ListenSocket — ...
6
votes
2answers
3k views

What are the pros and cons of Inter process communication done via sockets vs shared memory?

I understand that two of the many more options for inter process communication can be : Shared memory Sockets Actually I saw these two options being exposed by Intellij Idea for debugging a Java ...
6
votes
1answer
988 views

Solutions for implementing a full-duplex game server?

I am designing a game server which would be used for Android terminals. I've been searching for products or frameworks to use for two-way socket communication but haven't found anything worth ...
4
votes
5answers
2k views

Is there are problem holding large numbers of open socket connections for lengthy periods of time?

The application we have in mind is a relay server. The aim is to accept large numbers of incoming socket connections (at least thousands) that will stay open for lengthy periods (hours or maybe days). ...
4
votes
2answers
1k views

How to match responses from a server with their corresponding requests?

There is a server that responds to requests on a socket. The client has functions to emit requests and functions to handle responses from the server. The problem is that the request sending function ...
4
votes
1answer
773 views

How much overhead is there in persistent connections?

Ok so I'm musing over a little side project I want to start. Essentially its a multi-session web based FTP client. Multi-session in that you can log into several FTP servers at the same time and ...
3
votes
6answers
2k views

UDP order of packets with direct connection

If i have two systems (A and B) running on LAN(INTRANET) which are directly connected. There are no routers in the middle. In this case, if system A sends a few UDP packets every few milliseconds to ...
3
votes
1answer
366 views

Are there security implications to using dynamically-assigned TCP port numbers?

I'm getting pushback from operations for having a server process listen on a dynamically-assigned port number (i.e. it binds a socket to a port number of 0, triggering a dynamic assignment by the OS, ...
3
votes
1answer
1k views

Protocol for closing a socket connection

I'm rolling my own application protocol on top of TCP. I'm using Linux and C. I'm wondering whether there is an advisable sequence to closing a socket connection. The client will always initiate ...
3
votes
1answer
8k views

Non Blocking Sockets vs Blocking sockets - UDP - C&linux

When to use blocking sockets over non blocking sockets on UDP? Question 1:What's is recommended for the following scenario ? Multiple clients send data over multiple UDP sockets, i.e. say client1 ...
3
votes
2answers
190 views

How to find an error in a tcp server application for which there is no source code

I have a c++/cli tcp client application sending a data in a specific format like L,20100930033425093,-5.929958,13.164021 to a main application on port 9000.The main application is actually done by the ...
3
votes
1answer
223 views

Sockets intricacies in TCP and UDP

I am quite familiar with TCP and UDP. I understand the process by which TCP establishes connections and other theoretical facts about TCP but when reading up about TCP hole punching for NAT ...
3
votes
1answer
68 views

Design approach to outsourcing a socket in an own thread

I want to extend an existing server written in C++ to be able to communicate with an other server over websockets (e.g. logging or user authorisation purposes). All examples (including the very well ...
3
votes
1answer
653 views

Is ZeroMQ a good choice to make a Python app and a C# managed assembly work together?

I have a task that involves talking to a .NET-based API (namely AutoCAD) to retrieve data, send commands, and react to events. I want to separate the API operations and the proper program logic ...
2
votes
6answers
7k views

Serializing Data Structures in C [closed]

I've recently read three separate books on algorithms and data structures, tcp/ip socket programming, and programming with memory. The book about memory briefly discussed the topic of serializing data ...
2
votes
1answer
323 views

Application protocols and state machines: designing a complicated server

I'm designing and prototyping a server that has the following characteristics: during the daemon's initialization it spawns nine "manager" servers, each of which solves one part of the overall ...
2
votes
2answers
410 views

Should I lock a list of objects while a socket is receiving messages?

I have a scenario where I will be receiving messages through a socket connection. I also need to keep a list of 100 messages (such as List) and periodically toss out old messages from the list when a ...
2
votes
2answers
3k views

Realtime (almost) bidrectional communication in Java

I will explain the context of the problem first. For a University project I'm going to implement an Android application. The Android application (and others) will be able to send data to a remote ...
2
votes
1answer
352 views

Handling large amounts of sockets

I am working on a project in which we have a desktop application that should be able to receive commands from a web application. To solve this issue, using sockets seems like a good approach (instead ...
2
votes
1answer
295 views

What to choose API based server or Socket based server for data driven application

I am working on a project which has a Desktop Application for MAC/COCOA, a native application for iPhone another native application in iPad. All the application do almost same thing. The applications ...
2
votes
1answer
218 views

Setting source IP with posix sockets

Is it possible for an application to request a socket (tcp) and have it set the source address without using raw sockets? (the addresses would be bound to the interfaces. [no spoofing]). This would be ...
1
vote
2answers
303 views

Java Desktop Application Requirement - Is sockets the preferred choice ?

I'm currently working on a requirement for a desktop application - using Java If for some reason the GUI crashes, it shouldn't affect the background process. Once the GUI is restarted - the ...
1
vote
1answer
152 views

Synchronized access to network industrial equipment

I have an industrial equipment which is controlled by a software. The software connects to it using sockets, and keeps the connection all the time alive, while from time to time sending commands to ...
1
vote
1answer
260 views

How to refresh/keep up to date content in the browser without overloading the server

I am not very educated on this topic of programming so I am seeking any advice/knowledge. I am coding a web app in PHP, and this particular task requires updating the display after the server has new ...
1
vote
2answers
169 views

Examples of UNIX Domain Socket Usage [closed]

Can anyone give an example of instances in which the AF_UNIX i.e unix domain sockets are used for process communication in a unix-based system
1
vote
2answers
350 views

Implementing the transport layer for a SIP UAC

I have a somewhat simple, but specific, question about implementing the transport layer for a SIP UAC. Do I expect the response to a request on the same socket that I sent the request on, or do I let ...
1
vote
1answer
76 views

What is a good way for Tomcat to interact with another Java application running on the local machine

I'm new to using Java within a web environment. At the moment I have a Java application that we run on a local machine, we'll call it the server app. We want to add the ability to communicate with ...
1
vote
1answer
370 views

Best approach for near real time message passing from server to client across router?

I am developing an application which must run on up to thousands of client systems that I control (Linux) which are connected behind common NAT devices to public Internet. Each of these client ...
1
vote
2answers
707 views

How to plan a client/server app networking architecture to cope with multiple unrelated exchanges of data?

I'm coding a server/client application pair in Java, as I learn about it. I have basic functionality of sending a message to the server and parsing it but in thinking about the big picture of their ...
1
vote
1answer
134 views

Multi-threaded winforms with multiple child forms using sockets

I develop application with two main option grouped by groupBox in main form. First option is run server with specific behaviour for example I choose TCP protocol, type IP address, port number and ...
1
vote
1answer
74 views

How do I effectively test, and log, network status with a Java Application? [closed]

I want to write an application (in Java) that basically detects when I lose my internet connection, and then log the time. To make things more challenging, I'd like to figure out the point of failure. ...
1
vote
0answers
281 views

Should I use WCF, raw Sockets, or something else to send receive data from a command line app?

I have a command line app, that will be multi-threaded and serve inbound and outbound clients. It will send and receive Binary data structures generated by protobuf.net My question is, how should ...
0
votes
3answers
1k views

Writing a TCP protocol or use HTTP for file transfer?

I want to write a server side application which allows several users to exchange files (not above 3MB) in the following way: user A connects to (server) S. User B connects to S. User C connects S. ...
0
votes
1answer
131 views

Limitations of modern programming languages for low-level network programming [closed]

For say a network packet sniffer, are there any of the more modern high level languages such as C# or Java, that would actually be unsuitable or limiting when it would come to constructing a packet ...
0
votes
1answer
309 views

String sentence consistency when sent over sockets

I am learning socket programming. I have a Java application as my server, and C# for the client. Just sending string lines from one to another. Below I have code snippets showing how I am currently ...
0
votes
1answer
276 views

Is TCP message order still guaranteed when using async IO

Here the scenario I'm imagining. Two messages are transferred, both will require 2 packets each (I know you don't deal with packets directly with TCP, but on the IP level each message will consist of ...
0
votes
3answers
261 views

Socket Connecting to Large number of IPs

I have a text file of ~600 CIDR notation IP blocks which, when expanded, amount to ~17.5M IP addresses. I need to socket connect to each one. If it connects, I add it to a "live" list, if it returns ...
0
votes
1answer
445 views

How can you add acknowledgement functionality to a Command pattern, given the response from receiver is gotten asynchronously on Server?

I have a scenario where I will implement Command pattern like described in this article. Actually from an Asp.Net MVC view, some user will invoke different commands/actions like Start Live Video, ...
0
votes
1answer
356 views

For a socket based application : how must I handle dynamic ip adress?

I plan to write an network application whose use steps is the following : Connect to the server and choose a name (and enter your email "id") The list of others "free" (not playing a game) players ...
0
votes
1answer
214 views

Are Python sockets suitable for file synchronization?

I'm working in an organisation with limited funds. They can't afford a business account on Dropbox. However, they would find it useful to have all their files synchronized on local machines. I've ...
0
votes
1answer
482 views

How do I perform some actions in my Java program whenever a particular network interface comes up?

I wanted to perform some actions in my Java program whenever a particular interface comes up (network interface ppp0 e.g.). However I figured out it was way too clumsy to keep polling the interface to ...
0
votes
1answer
484 views

Time Tracking - Best method?

I'm looking to track the time it takes users to traverse through a few forms I have on a website. My old thought was to use something like jQuery to poll the server updating the time spent on a page, ...
0
votes
1answer
87 views

Is this pattern RESTful? Or something else?

I'm working on a new project that will create a web-based API to perform CRUD operations on a relational database. Originally, I was going to create the API as http-based, and make it RESTful so ...