Multiple port listening on single socket

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Dear Sir,

I have a project in which I have to listen more than 100 ports in VB.net.
I m little bit confused whether to listen these port on single socket through multithreading or to listen these port on individual socket.

Also data occurance is in seconds. And I dont want to miss any data as it is very critical.

Please suggest some solution for this.

Posted 8-May-13 21:35pm

vinaysom

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Dave Kreskowiak · Answer 1 · 2013-05-09T01:45:00

100 posts?? OK, that's weird. I've never heard of any application that listens to 100 ports at the same time, nor any situation where it's justified.

You might want to spell out EXACTLY what is going on with these 100 ports. Why do you think you have to use 100 ports? How much data is coming from a remote device at one time?

Only one thing can listen on a port at a time, so this doesn't make a lot of sense.

pdoxtader · Answer 2 · 2013-05-09T03:32:00

Solution 2

Dave's right - we need more information... There has to be a better way. How about listening on a single port and accepting multiple (100 or more) connections? That seems like the right way to go to me. But in short - you can't listen to 100 ports with a single socket. You'll need 100 sockets. If that's what you really want to do.

Why not check out my article: Reusable multithreaded TCP client and server classes with example project in VB.NET

I think with this, you will likely be able to do what you need.

- Pete

Posted 9-May-13 3:32am

pdoxtader

Updated 9-May-13 3:35am

v2

Comments

vinaysom 10-May-13 9:48am

thanks a lot sir,
Actually my project is related to fetch data from remote terminal unit situated around 500 kms away. these units sends data through GPRS to a public ip where i have to get this data and also acknowledge the remote unit with some message. After every 4-5 seconds the next data will arrive on the server. So pls suggest the solution for this..

pdoxtader 10-May-13 10:18am

This really isn't enough information... And you will need to attempt to write the code yourself and then come to us if you get stuck. I can't write it for you. Do you have 100 of these in the field, all trying to talk to your public IP on a different port? How does the data arrive? XML? You just need to give us more... or failing that, hire a consultant to handle it for you.

vinaysom 12-May-13 12:01pm

Dear Sir,
Actually there are 96 microcontroller based remote terminal units situated on water delevery tanks with GPRS activated SIM through which they are sending data to base station on a specific port (from 32001 to 32096) where I am listening these ports on individual socket. But due to fast occurance of data (4-5) the connection between RTus and server are lost. And again these RTUs connnect with server and sending data again. But by this way I can get connect only 40 to 50 RTUs not all the 96. Please suggest some solution for this

pdoxtader 14-May-13 8:41am

What operating system are you running on the server these RTUs connect to?

vinaysom 18-May-13 3:14am

windows7 64 bit sir

pdoxtader 20-May-13 7:31am

That is probably your problem. Windows 7 x64 is a workstation, not a server o/s. It has a 15 concurrent connection limit. If you need to make sure can have all 96 remote machines connect concurrently, you'll need to run your software on a server o/s.