After doing a bunch of research I created a function to use the NetworkInterface class and yank the information out of it. If you have multiple network interfaces (which pretty much all computers do now-a-days) you have no idea which address goes with which network interface. I don't like this at all because it just gets all the addresses assigned to your computer. I have looked all over the place for a way to find my local IP address, but everywhere I find it says to use: Dns.GetHostEntry(Dns.GetHostName()) I know this may be kicking a dead horse, but maybe this can help someone. There is no real connection established, hence the specified remote ip can be unreachable. So, this method will give the local address that would be used to connect to the specified remote host.
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The last part seems to be undocumented officially but it looks like an integral trait of Berkeley sockets API (a side effect of UDP "connected" state) that works reliably in both Windows and Linux across versions and distributions. This includes checking the existence of the route to the destination according to the system's routing table and setting the local endpoint accordingly. IPEndPoint endPoint = socket.LocalEndPoint as IPEndPoint Ĭonnect on a UDP socket has the following effect: it sets the destination for Send/ Recv, discards all packets from other addresses, and - which is what we use - transfers the socket into "connected" state, settings its appropriate fields. Using (Socket socket = new Socket(AddressFamily.InterNetwork, SocketType.Dgram, 0)) Connect a UDP socket and read its local endpoint: string localIP There is a more accurate way when there are multi ip addresses available on local machine. How can I see if my computer is connected to a network with C# and if it is then to get the LAN IP address. If I am not connected to a network and I am connected to the internet directly via a modem with no router then I would like to get an error. With this example I get several IP addresses, but I'm only interested in getting the one that the router assigns to the computer running the program: the IP that I would give to someone if he wishes to access a shared folder in my computer for instance. IPHostEntry ipEntry = Dns.GetHostEntry(strHostName) Ĭonsole.WriteLine("IP Address ", i, addr.ToString()) Then using host name, get the IP address list. First get the host name of local machine.Ĭonsole.WriteLine("Local Machine's Host Name: " + strHostName) And a lot of them look like this example: String strHostName = string.Empty
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In the internet there are several places that show you how to get an IP address.
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