I wrote a few lines of code to send a UDP packet to a remote machine. What
worries me is the program code says it sends the data regardless of the
remote IP or port. If the IP is ok , a sniffer verifies the packet was sent.
However, if I give the sendto statement a bogus IP or port (that is not open
on the remote machine), the code executes with no errors. I know UDP is
connection-less, but the framework should balk at the bad or port (or at
least it does in C or VB6). Any ideas how to get an error return? I used to
get a destination or port unreachable error in VB6, when I did a sendto with
a bogus IP or closed port. Heres the code:
Lets say my network is 192.168.0.0..
Dim txString() As Byte = Encoding.ASCII.GetBytes("test")
txSocket = New Socket(AddressFamily.InterNetwork, SocketType.Dgram,
ProtocolType.Udp)
Dim txEP As New IPEndPoint(IPAddress.Parse("172.18.1.99"), 2967)
Try
Dim r = txSocket.SendTo(txString, txEP) 'returns 5 bytes data sent to 172
network (ip not exist)
Console.WriteLine(r)
Catch ex As Exception
Console.WriteLine(ex.Message)
End Try
Thanks,
BUC
