Direct Connection between clients using sockets

Hi, I'm a new user and i have a problem with sockets:
The question is how can i directly connect two users that are already connected to a server in other machine???
I mean
user1 is connected to server
user2 is connected to server
user1 tries to communicate with user1 but don't want to use the server, and the server only provides the client1's ip
I first thought to do this:
user2 asks to server for the info of a client1-server waiting for connections, and i think it could work fine, but only if the ports are not closed by firewall, because client-server will be running in a transparent mode for user and user may not know anything about servers, sockets, ports, etc. the user only will work with a gui or something else and that's all
Does anybody know what can i do to make this possible???
PD
Sorry for my bad English

It can be implemented like you said. Make one of the clients open a serversocket and pass the ip and port number through the server to the other client with information on where to connect.
If you're going to use direct connection between clients a lot then I would recommend that every client open a default serversocket at startup and register that information with the server and then every other client can ask the server for the ip and port to whatever client they wish to open a direct connection to.
Be aware that clients often are behind NATs and firewalls, so if need to deal with those issues you got to use hole punching (http://en.wikipedia.org/wiki/hole_punching) - pref on a known port like 80 - and to deal with the less frequently used application firewalls you can use http encapsulation in addition.

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Direct connection between 2 clients without any configuration!

I wan to make a system act like hamachi or logmein (websever & clients).
I have a webserver on the internet and two client from different networks connected to this webserver, now i want to make directly connection between these clients without any configuration on router. I think it is possible because all infomation about clients network could be got from http request which they send to server. But i don't know what exact fields in the header of http request that i need and how to set them to create connection between clients. I need some ideas about this issue.
Edited by: tulous on Nov 20, 2008 7:40 PM
Edited by: tulous on Nov 20, 2008 7:41 PM

tulous wrote:
I know, so if you want to use a remote control tool such as: VNC, remote desktop you must config on router or server. But even if you had a proxy(permit port 80) when you type www.sun.com you will get data from it, this data was sent from Sun to your proxy and in some way the data was return to your browser. So i think if we have enough information(it come from the webserver) we could init a connection between 2 client. An example of this is Hamachi.
At first 2 hamachi clients connect to a server of hamachi, when they have their id, a tunnel between 2 clients was established without any configuration on proxy(certainly that server did not deny port of hamachi). From now 2 clients can exchange data not through the server. The same in logmein, you can remote desktop any where with zero configuration, but the speed is guarantee because they contact to server for query information, but the data was transmited directly. Sorry if i make mistake.It doesn't work the way you think.
There is a proxy or you have to have one side listening with a ServerSocket and have ports opened as needed. You can't create a Socket connection on server A between clients B and C and then pass it off to clients B and C and magically they just talk to each other.
It does not work that way. It is impossible to do it that way.

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as topic

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In our new pre-production environment we have several servers connected to a 3750 switch, which is then connected to a CSS 11503. Upstream the CSS is then connected to an ASA firewall pair. The CSS VIPs are 10.22.1.0/24 on the "outside" and the servers have 10.21.1.0/24 addresses on the inside. The CSS inside & server 3750 switchports are all on the same VLAN. There is no PAT/NAT configured (except for the VIP being translated to a chosen server IP I suppose).
Whilst the clients will connect to the servers via the VIPs what we want is for each server to also be able to talk to other servers via a VIP. This is because some of the servers provide a service (LDAP actually) that we would like to be load balanced.
Now, what is curious, is that *this works* in our production environment where the servers are *directly* attached to the 8 port switch module in the CSS. However in this new environment, where the 3750 is between the servers and the CSS, it doesn't (actually you can ping the VIP sucessfully but nothing else works).
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circuit VLAN1
ip address 10.21.1.100 255.255.255.0
circuit VLAN2
ip address 10.22.1.1 255.255.255.0
keep alive ssokeepalive
type http
keepalive port 7777
uri "/sso/status"
keepalive frequency 10
keepalive maxfailure 2
tcp-close fin
active
service pulpldp001sso
ip address 10.21.1.6
keepalive type named ssokeepalive
active
content SSO
vip address 10.22.1.12
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port 7777
application http
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add service pulldp001
active
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PS. the CSS is running 7.50 at the moment but could upgrade to 8.2 if required

Thank you Adedayo - that appears to have done the trick! I can't believe it: one little keyword!
I have to say, even once you told me the answer I still didn't find the Cisco content config manual very helpful on this point (perhaps I'm looking in the wrong place?).
Note: we're not currently doing any PAT on the CSS so don't have any source groups set up - perhaps most people do and so don't have the same problem.
I'll get chance to report back on some proper testing next week and promise to update this conversation.
Adedayo: sorry, I wanted to flag your post as solving my problem once I was sure next week but now the tick box has gone - if you reply again I'll flag that! I appreciate you taking the trouble to post.
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Jarojasag wrote:
Hello:
I Bought my MacBook a few weeks ago and i want to transfer some information from my pc, which runs Ubuntu Jaunty. What should i do?
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A GUI problem when using sockets

I have a problem with Client.java. it creates a socket to connect to a serversocket. I do this through the method "runClient()" .
the problem is that if I call runClient from an actionlistener add to a button. here the graphics of the window will disappear and you will be stuck for reading input (input.readObject())
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import java.awt.event.*;
import java.net.*;
import java.io.*;
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import javax.swing.event.*;
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>
Olian Saludew wrote:
> Hi guys,
>
> is the new WS adapter designed only for Direct Connection between 2 SAP Systems? Or can I use it also in a SOAP->PI->WS (Abap Proxy) scenario?
>
> Is there somebody who has developed this type of scenario?
>
> Thanks,
>
> Olian
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Direct Connection between clients using sockets

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