gaukhar 0 Newbie Poster

Hello,

I am no expert just trying to make my final year project work.

I am trying to discover devices on my network and for that use the following code.

private void broadcast()
        {
            Socket socket = new Socket(AddressFamily.InterNetwork, SocketType.Dgram, ProtocolType.Udp);
            socket.SetSocketOption(SocketOptionLevel.Socket, SocketOptionName.Broadcast, true);
            socket.SetSocketOption(SocketOptionLevel.Socket, SocketOptionName.ReceiveTimeout, 1000);

            IPEndPoint bcastTarget = new IPEndPoint(IPAddress.Parse("255.255.255.255"), 161);

            SnmpV2Packet disPacket = new SnmpV2Packet("public");
            disPacket.Pdu.VbList.Add("1.3.6.1.2.1.1.1.0"); //System Description OID
            byte[] outBuffer = disPacket.encode();

            // Send the request
            socket.SendTo(outBuffer, (EndPoint)bcastTarget);

            IPEndPoint inEP = new IPEndPoint(IPAddress.Any, 0);
            byte[] inbuf = new byte[32 * 1024];

            DateTime startTime = DateTime.Now;
            while ((DateTime.Now - startTime).TotalSeconds < 1)
            {
                int inlen = 0;
                try
                {
                    EndPoint ep = inEP;
                    inlen = socket.ReceiveFrom(inbuf, ref ep);
                    inEP = ep as IPEndPoint;
                }
                catch
                {
                    inlen = -1;
                }
                if (inlen > 0)
                {
                    if (!inEP.Address.Equals(IPAddress.Broadcast))
                    {
                        try
                        {
                            disPacket.decode(inbuf, inlen);
                            Console.WriteLine("Machine Name: " + disPacket.Pdu.VbList[0].Value.ToString() + 
                            "; IP Address: " + inEP.Address.ToString());
                        }
                        catch
                        {
                            continue;
                        }
                    }
                }
            }
        }

I am a newbie so forgive me if this is an obvious mistake. When I try to run my code i get a SocketException which says "A connection attempt failed because the connected party did not prperly respond after a period of time, or established connection failed because conneced host failed to respond". I am obviously not setting up my network right. I have snmp service and snmp trap services running on my laptop. I am conneced to a wireless router which has another pc connected. Please can you point out the mistake?

Thank you

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