端口不NAT，两个子网中的两端之间不可能通信。至少要有一方处在公网下或有路由端口映射，不必双方都映射。
成都创新互联是专业的台州网站建设公司，台州接单;提供网站设计、网站制作,网页设计,网站设计,建网站,PHP网站建设等专业做网站服务;采用PHP框架,可快速的进行台州网站开发网页制作和功能扩展;专业做搜索引擎喜爱的网站,专业的做网站团队,希望更多企业前来合作!
建议题主找本计算机网络的书研读一下子网划分这块儿。
用 vb.net socket通信
Dim th As Threading.Thread
2 Dim tcpl As System.Net.Sockets.TcpListener
3
4 Private Sub Form1_Load()Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
5 th = New System.Threading.Thread(New System.Threading.ThreadStart(AddressOf MyListen))
6 th.Start()
7 End Sub
8
9 Public Sub SendMessage()Sub SendMessage(ByVal IP As String, ByVal SendMsg As String)
10 Try
11 If IP "" Then
12 Dim tcpc As New System.Net.Sockets.TcpClient(IP, 5656)
13 Dim tcpStream As Net.Sockets.NetworkStream = tcpc.GetStream
14 Dim reqStream As New IO.StreamWriter(tcpStream)
15 reqStream.Write(SendMsg)
16 reqStream.Flush()
17 tcpStream.Close()
18 tcpc.Close()
19 End If
20 Catch ex As Exception
21 MsgBox(ex.Message.ToString)
22 End Try
23 End Sub
24 Private Sub MyListen()Sub MyListen()
25 Try
26 Dim ipAddress As System.Net.IPAddress = System.Net.Dns.Resolve(System.Net.Dns.GetHostName).AddressList(0)
27 tcpl = New System.Net.Sockets.TcpListener(ipAddress, 5656)
28 tcpl.Start()
29 While True
30 Dim s As System.Net.Sockets.Socket = tcpl.AcceptSocket()
31 Dim MyBuffer(1024) As Byte
32 Dim i As Integer
33 i = s.Receive(MyBuffer)
34 If i 0 Then
35 Dim lstrRec As String
36 Dim j As Integer
37 For j = 0 To i - 1
38 TextBox1.Text += Chr(MyBuffer(j)) ","
39 Next
40 End If
41 End While
42 Catch ex As Exception
43 MsgBox(ex.Message.ToString)
44 End Try
45 End Sub
46
47 Private Sub Button1_Click()Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
48 SendMessage("192.168.0.61", TextBox2.Text)
49 End Sub
Private Sub Form_Load()
With Winsock1
.RemoteHost = "124.135.13.106" '对方的IP
.RemotePort = 1002 ' 对方的端口号
.Bind 1001 ' 本机的端口号
End With
End Sub
Private Sub Winsock1_DataArrival(ByVal bytesTotal As Long)
Dim strData As String
Winsock1.GetData strData '接收字节
List1.AddItem strData
End Sub
这个用UDP进行连接的。只不过是对单个机器进行的。
用VB5 Winsock控件创建TCP/IP通讯程序 随着Windows 95中文版和Windows NT Server 4.0中文版的流行， Microsoft公司推出了相应平台上的开发软件: Visual Basic 5.0 中文企业 版。它为Windows环境下的网络开发提供了强大的工具，Winsock控件就是其中之一。 Winsock控件建立在TCP、UDP协议的基础上，完成与远程计算机的通信。即使对TCP/IP不太熟悉的用户，使用该控件也可以在十几分钟内创建一个简单的客户机/服务器程序。下面我们对Winsock控件的事件、方法、属性按其在程序中出现的顺序分别作详细的介绍，以便更好地理解程序源代码。
