端口不NAT,兩個(gè)子網(wǎng)中的兩端之間不可能通信。至少要有一方處在公網(wǎng)下或有路由端口映射,不必雙方都映射。
東港ssl適用于網(wǎng)站、小程序/APP、API接口等需要進(jìn)行數(shù)據(jù)傳輸應(yīng)用場(chǎng)景,ssl證書(shū)未來(lái)市場(chǎng)廣闊!成為創(chuàng)新互聯(lián)的ssl證書(shū)銷(xiāo)售渠道,可以享受市場(chǎng)價(jià)格4-6折優(yōu)惠!如果有意向歡迎電話聯(lián)系或者加微信:18982081108(備注:SSL證書(shū)合作)期待與您的合作!
建議題主找本計(jì)算機(jī)網(wǎng)絡(luò)的書(shū)研讀一下子網(wǎng)劃分這塊兒。
傳輸Integer 數(shù)據(jù)類(lèi)型來(lái)傳輸比較方便.因?yàn)镮nteger 的取值可以是0x0000-0xFFFF .當(dāng)你把數(shù)據(jù)發(fā)送到目的主機(jī)后可以利用Hex() 把接收到的數(shù)據(jù)從十進(jìn)制轉(zhuǎn)換到十六進(jìn)制..
需要出口設(shè)備進(jìn)行映射內(nèi)部地址;或使用打洞技術(shù)穿透NAT,但使用TCP打洞非常困難。
參考
穿透NAT是非常困難的,因?yàn)镹AT的過(guò)程中在出口路由器上的Port已經(jīng)不是你定義的iPort了,具體是多少也不固定
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
服務(wù)器和客戶(hù)端都有,但是都是很基本的代碼,可以作為參考學(xué)習(xí)。。。
文章名稱(chēng):vb.nettcp網(wǎng)絡(luò) nettcpip
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