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Posted on 2006-10-26
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Hi experts, this is my noob question

My client application has got a textbox on the form.

User will type the IP address in the textbox then click "Connect" button to connect to the server

The Computer is running "the Server application" and the computer is running "the Client Application" are on the same Local Area Network

My purpose : the server computer and client computer are on the same Local Area Network

So in the client application , how can the client application can dectect if the ip address which entered by the user is LAN IP or Internet IP

and in the server application , how can the server application can dectect if the ip address of the connection from client application  is LAN IP or Internet IP






 
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Question by:lhquang
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Russell Libby earned 500 total points
ID: 17817089

When dealing with ip addresses, the following applies:

192.x.x.x // Commonly handed out by routers
10.x.x.x
172.x.x.x // not very common, but still seen

These IP addresses are defined as private address numbers. If the entered address starts with one of these, it is coming from an internal (private) network, otherwise its external (WAN/Internet).

Regards,
Russell


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by:pvlogchem
pvlogchem earned 500 total points
ID: 17864683
I found a page for you where you can find a method to check if a IP-address is inside the local network (look for the method called "WSocketIsAddrInSubNet") : http://www.mail-archive.com/twsocket@elists.org/msg06158.html
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