BorlandTalk.com Borland discussion newsgroups   Archives   FAQ   Search   Memberlist   Usergroups   Register   Profile   Log in to check your private messages   Log in  Establish connection with a subnetwork computer/server          BorlandTalk.com Forum Index -> C++ Builder (Internet Socket) View previous topic :: View next topic   Author Message qyte Guest Posted: Fri Apr 14, 2006 10:03 am    Post subject: Establish connection with a subnetwork computer/server How can i find out out the exact IP address of my subnetwok computer? The only IP which i can see is of the server computer. The problem i have is that i cannot run an application on my subnetwork computer as a server because i don't know its IP address. Back to top Hans Galema Guest Posted: Fri Apr 14, 2006 11:03 am    Post subject: Re: Establish connection with a subnetwork computer/server qyte wrote: Quote: How can i find out out the exact IP address of my subnetwok computer? Use ipconfig in a console window. Quote: The only IP which i can see is of the server computer. From where do you see that ? Where is the servercomputer ? On the internet ? Quote: The problem i have is that i cannot run an application on my subnetwork computer as a server because i don't know its IP address. This is all very unclear for me. You can let a serverapplication run on any computer. The question then of course is if that servercomputer is reachable for clientapplications on other computers. Please tell more exact how your configuration is. Is your serverapplication on a LAN computer and will clientapplications on the internet contact through the IP of a router ? Hans. Back to top qyte Guest Posted: Fri Apr 14, 2006 12:03 pm    Post subject: Re: Establish connection with a subnetwork computer/server Hans Galema wrote: Quote: qyte wrote: How can i find out out the exact IP address of my subnetwok computer? Use ipconfig in a console window. The only IP which i can see is of the server computer. From where do you see that ? Where is the servercomputer ? On the internet ? The problem i have is that i cannot run an application on my subnetwork computer as a server because i don't know its IP address. This is all very unclear for me. You can let a serverapplication run on any computer. The question then of course is if that servercomputer is reachable for clientapplications on other computers. Please tell more exact how your configuration is. Is your serverapplication on a LAN computer and will clientapplications on the internet contact through the IP of a router ? Maybe i was a little bit unclear. Let's say that i built a server app and i run it on a computer that runs inside a network but is NOT the server computer. What is the ip i need to use in order to run a client app from outside that network so that i can connect to that single computer. When i test my ip from inside the network computer it gives me the one the server of the network has on the internet, it seems that all computers on the network have the same IP. How can i determine the ip from within my server app given the fact that i know ONLY what the network's IP is? Back to top Hans Galema Guest Posted: Fri Apr 14, 2006 12:03 pm    Post subject: Re: Establish connection with a subnetwork computer/server qyte wrote: Quote: Maybe i was a little bit unclear. Let's say that i built a server app and i run it on a computer that runs inside a network but is NOT the server computer. What do you mean with 'the server computer'? The gateway computer ? The computer that is directly connected to the internet ? How is the connection with the internet done ? Quote: What is the ip i need to use in order to run a client app from outside that network so that i can connect to that single computer. Where is that client to begin with ? On the internet ? Such a client has to use your internet-IP. That can be the internet IP of your router or the internet IP of the computer that is directly connected to the internet. Quote: When i test my ip from inside the network computer it gives me the one the server of the network has on the internet, It would have helped if you had also told how you tested that. Quote: it seems that all computers on the network have the same IP. No. They have all the same internet-IP. They all have different LAN-IP's. Quote: How can i determine the ip from within my server app given the fact that i know ONLY what the network's IP is? Your serverapp can do nothing else but listen. You have to configure your router (or the computer that is directly configured to the internet) in such a way that it forwards requests on your serverapplication's listening port to the IP of the computer where your serverapplication is running on. That is called: portforwarding of NAT (network address translation). Hans. Back to top Remy Lebeau (TeamB) Guest Posted: Fri Apr 14, 2006 7:03 pm    Post subject: Re: Establish connection with a subnetwork computer/server "qyte" <gyte (AT) vivodinet (DOT) gr> wrote in message news:443f7e47$1 (AT) newsgroups (DOT) borland.com... Quote: Let's say that i built a server app and i run it on a computer that runs inside a network but is NOT the server computer. What is the ip i need to use in order to run a client app from outside that network so that i can connect to that single computer. The client can only connect to computers that are directly accessible to the outside world. It cannot connect to your networked computer directly at all (for the obvious reason that the computer is simply not reachable from the outside). The client needs to know the IP of a computer that is publically accessible. The only reliable way to get such an IP is to query an external source, such as http://checkip.dyndns.org or similar web site, to see what IP it reports. You then need some kind of hardware router or software proxy running at that IP address to forward all relavant inbound data to the computer that is running your application. Quote: When i test my ip from inside the network computer it gives me the one the server of the network has on the internet How exactly are you retreiving that IP? Quote: it seems that all computers on the network have the same IP. If they all share the same internet connection, then yes, the public IP will be shared amongst them. As such, routing of data would have to be controlled by the port numbers that are involved. All hardware routers have Port Forwarding capabilities. 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