Hi everybody
I find the code of Client - server program

Server.C: http://paste.ubuntu.com/334989/
Client.C: http://paste.ubuntu.com/334993/

I can use it to exchange some message between to different shell windows. But i can't run the client program on one machine, and server program on the other machine so that it can exchange some messages.

Can you help me.

Thank you very much!

I am by no means an expert in this field but I have downloaded and built your example programs and ran them. They pass messages between different machines fine for me. It may help if you say exactly what you are entering to run the programs (both ends) and what results you are getting. You should provide these for when things work and do not work for completeness.

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I run it successful in a computer.
In one terminal, i type: ./receiver
In other terminal, i type ./sender 127.0.0.1 message <127.0.0.1 : localhost >
./sender <hostname> <message>

And my problems here is:

I install Ubuntu 9.10 on VMware Workstation. I using my university's networks via HTTP proxy: Proxy and port: 8080.

Can u tell me, how can i find hostname in "sender <hostname> <message>"

Thank you very much

I'm not sure what you mean here.

Here's what I did.. On one machine I typed "/server" for the "receiver" end. This is the program built from your "server.c" source code.
On another I ran "/client 192.168.1.6 'Hello from client' " where 192.168.1.6 is the IP of the machine running the server program. Note that the message needs enclosing in quotes or the client program errors out. For me this works between machines or between terminals on the same machine using localhost as the hostname.

To try and replicate your setup I have also tried running this in a Linux Virtual machine inside VMWare. This too works fine. I have the VM set to use bridged networking and it gets it's own unique IP via DHCP from the network DHCP server. In effect this means the VM just looks like another workstation on the network. I can run two such VM's and communicate between both using your programs or between the host and the VM's.

If you wish to find the IP of the Ubuntu VM you can run "ifconfig". You may use this as the hostname for the programs.

Before you worry about two networked machines passing messages via your code I would try pinging each one from the other one to make sure they can see each other across the network and that your IP's are correct.

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I am so sorry. But i follow you and step to step in VMware.
I have Ip of each computer by run "ifconfig" on each computer.
But when i ping each one from the other one, I have a error: Destination Host Unreachable

I don't know the reason why i can't do it. So sad.

Would you please print screen on each step to tell me how to use this program in correctly way (i'm sorry about it because may be you're very busy.)

Thank you very much

i ping each one from the other one successfully
But i can't sent message between 2 computer (
i don't know the reason