IP of a router

[hsn]

hello everyone
i working on a system and i need to get the IP address o a router by using java.
the problem is whenever i create a program it gives me the IP address of my PC . by using a getlocalhost function.

thanks for reading my question

regards hsn

[Nepomuk]

hello everyone
i working on a system and i need to get the IP address o a router by using java.
the problem is whenever i create a program it gives me the IP address of my PC . by using a getlocalhost function.

thanks for reading my question

regards hsn

Do you mean the IP with which your router has connected to the internet? If so, the only option I can think of right now is with a client-server-solution, where the server tells you, what IP you're connecting from... Or of course, your router can tell you itself in some way. What kind of router are you using? Can you run programs on it?

Greetings,
Nepomuk

[pronerd]

If this is a web application, and if it is being accessed though a public domain, you could have it send a request to it self. Then you can get the external IP address from the HTTP headers. This will only work if the request you send goes outside your network to be resolved.

whenever i create a program it gives me the IP address of my PC . by using a getlocalhost function.

That is what it should do. The getlocalhost() method as the name suggests gets the local host info.

[hsn]

take it like this there is only one PC and it is connected to a router. there is no internet connection.

thanks

[hsn]

the IP address which i require is the local gateway address

[pronerd]

there is no internet connection.

There does not need to be. You can run a server without an internet connection.

The bottom line here is that the information you are looking for does not exist on the PC you are running your Java app on. So there is no way for the JRE to know what you want.

I am assuming that router must be connected to something else other than a single PC. If not then it does not matter what IP is assigned since there would be nothing else to connect to.

[pronerd]

the IP address which i require is the local gateway address

Of the router or the PC? What are you trying to use the gateway IP for? The whole point of Java is to not have to be tied that closely to the hardware you are running on.