UDP packet capturing in c#

Question

Wireshark captures UDP packets in my LAN with follwoing details

Source IP            192.168.1.2
Destination IP      233.x.x.x
Source Port        24098
Desti         


        

Answer 1

Using Pcap.Net in https://github.com/PcapDotNet

Especific exemple: https://github.com/PcapDotNet/Pcap.Net/wiki/Pcap.Net-Tutorial-Interpreting-the-packets

// Callback function invoked by libpcap for every incoming packet
    private static void PacketHandler(Packet packet)
    {
        // print timestamp and length of the packet
        Console.WriteLine(packet.Timestamp.ToString("yyyy-MM-dd hh:mm:ss.fff") + " length:" + packet.Length);

        IpV4Datagram ip = packet.Ethernet.IpV4;
        UdpDatagram udp = ip.Udp;

        // print ip addresses and udp ports
        Console.WriteLine(ip.Source + ":" + udp.SourcePort+ " -> " + ip.Destination + ":" + udp.DestinationPort);
    }

Output: 2009-09-12 11:25:51.117 length:84 10.0.0.8:49003 -> 208.67.222.222:53 2009-09-12 11:25:51.212 length:125 208.67.222.222:53 -> 10.0.0.8:49003 2009-09-12 11:25:54.323 length:80 10.0.0.8:39209 -> 208.67.222.222:53 2009-09-12 11:25:54.426 length:75 10.0.0.8:47869 -> 208.67.222.222:53 2009-09-12 11:25:54.517 length:236 208.67.222.222:53 -> 10.0.0.8:39209 2009-09-12 11:25:54.621 length:91 208.67.222.222:53 -> 10.0.0.8:47869