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copied!<p>Maybe <a href="http://netresearch.ics.uci.edu/kfujii/jpcap/doc" rel="noreferrer">Jpcap</a> can help. Notice that there's a Sourceforge project with the same name, but it doesn't seem to be the same project.</p> <p>Here's some sample code (from the library's tutorial) that uses Jpcap to send a TCP packet and an Ethernet frame:</p> <p>Edit: The sample code does create a <code>TCPPacket</code>, but you may create a regular <code>Packet</code> instead.</p> <pre><code>//open a network interface to send a packet to JpcapSender sender=JpcapSender.openDevice(devices[index]); //create a TCP packet with specified port numbers, flags, and other parameters TCPPacket p=new TCPPacket(12,34,56,78,false,false,false,false,true,true,true,true,10,10); //specify IPv4 header parameters p.setIPv4Parameter(0,false,false,false,0,false,false,false,0,1010101,100,IPPacket.IPPROTO_TCP, InetAddress.getByName("www.microsoft.com"),InetAddress.getByName("www.google.com")); //set the data field of the packet p.data=("data").getBytes(); //create an Ethernet packet (frame) EthernetPacket ether=new EthernetPacket(); //set frame type as IP ether.frametype=EthernetPacket.ETHERTYPE_IP; //set source and destination MAC addresses ether.src_mac=new byte[]{(byte)0,(byte)1,(byte)2,(byte)3,(byte)4,(byte)5}; ether.dst_mac=new byte[]{(byte)0,(byte)6,(byte)7,(byte)8,(byte)9,(byte)10}; //set the datalink frame of the packet p as ether p.datalink=ether; //send the packet p sender.sendPacket(p); sender.close(); </code></pre>

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