Tcp ip

[Blixa]

Hello,

I have a (hopefully) small problem/question.
When I create a TCP server/client it always goes for my network IP.
How do I get this to listen/read the main ip? (the one outside thats: me -> network -> router/modem -> the internet)

Thanks in advance

- Blixa

[motil]

this will cause it to listen to any ip

 listener = New System.Net.Sockets.TcpListener(System.Net.IPAddress.Any, PortNumber)

[Blixa]

I tried that. How do I figure out on which ip(s) its running?

[motil]

you can get the clinet ip once you accept the tcp request.

incomingClient = listener.AcceptTcpClient
ClientIP = incomingClient.Client.RemoteEndPoint.ToString()

[Blixa]

I mean how do I figure out on what IP the server is running at that moment.

[motil]

try

  Dim h As System.Net.IPHostEntry = System.Net.Dns.GetHostEntry(System.Net.Dns.GetHostName)
        MessageBox.Show(h.AddressList.GetValue(0).ToString)

[Blixa]

That seems to work , except it running on IP6 , how can I force IP4?

Edit:

I looped through the whole list but it doesnt give the IP it should, seem only to be local IPs.
I need to connect to an computer at home from work so I need a server to listen the my home's IP.

any suggestion/help/anything?

[jmcilhinney]

First up, your computer can, and does, have multiple IP addresses. Secondly, the IP address of your computer is NOT the IP address that people see on the Internet. Your ISP assigns a public IP address to you and that is what others, e.g. web servers, see when they communicate with you. Your router assigns an internal IP address to your computer, which is how multiple computers can share a single internet connection. Your internal IP address is useless if you want to be able to communicate with someone across the internet.

If you want to communicate with the outside world then you need to know the IP address that your ISP assigned to you. If you have a static IP address then your ISP will have already told you what it is. Whether it's static or dynamic, you should be able to get it from the property pages of your router. If you want to communicate with the outside world then you'll also have to set up port forwarding on your router, which is well beyond the scope of a VB forum. If you have a dynamic IP address then you'll have to let anyone who you want to be able to contact you know what it is first, which is why you should get a static IP address if you want to run servers.

[Blixa]

I know my own IP address.
and I basicly need to forward port 99999 to my pc?

thanks for the replys so far

[dbasnett]

        'yahoo as ip
        Dim ip As System.Net.IPAddress = System.Net.IPAddress.Parse("209.191.122.70")
        'reverse lookup
        Dim he As System.Net.IPHostEntry = System.Net.Dns.GetHostEntry(ip)
        'check addresses
        For Each foo In he.AddressList
            If foo.AddressFamily = Net.Sockets.AddressFamily.InterNetwork Then
                'ipv4
                Stop
            ElseIf foo.AddressFamily = Net.Sockets.AddressFamily.InterNetworkV6 Then
                'ipv6
                Stop
            End If
        Next

[dbasnett]

Did your ISP provide you a public IP address, or arrange to have port 99,999 forwarded to your network. I doubt the latter as that is not a legal port number.

[Blixa]

I have a public IP, the 99999 was just an example.

[jmcilhinney]

So then, if someone wants to contact you across the internet then they need to specify your public IP address and a port number. You will have to have forwarded that port number to your computer on your router. Obviously you must set up port forwarding first, then tell the clients what port number to use. The code is exactly the same whether you're communicating across your LAN or over the internet: you specify an IP address and a port number. The difference is who receives and interprets those values: the server itself or the router.

[dbasnett]

So then, if someone wants to contact you across the internet then they need to specify your public IP address and a port number. You will have to have forwarded that port number to your computer on your router. Obviously you must set up port forwarding first, then tell the clients what port number to use. The code is exactly the same whether you're communicating across your LAN or over the internet: you specify an IP address and a port number. The difference is who receives and interprets those values: the server itself or the router.

Agreed. If you have this set up properly, the only thing that can go wrong is if the ISP is blocking the port you are trying to use.

[Blixa]

ok thanks for the help ganna try to get this working.