package main import ( "github.com/google/gopacket" "github.com/google/gopacket/layers" ) func main() { // create a new Ethernet packet ethPacket := gopacket.NewPacket([]byte{}, layers.LayerTypeEthernet, gopacket.Default) // add an IPv4 packet layer ipLayer := &layers.IPv4{ SrcIP: net.ParseIP("192.0.2.1"), DstIP: net.ParseIP("198.51.100.1"), Protocol: layers.IPProtocolTCP, } ethPacket.AddLayer(ipLayer) // add a TCP packet layer tcpLayer := &layers.TCP{ SrcPort: layers.TCPPort(12345), DstPort: layers.TCPPort(80), SYN: true, } ethPacket.AddLayer(tcpLayer) // serialize the packet to a byte slice buf := gopacket.NewSerializeBuffer() if err := gopacket.SerializePacket(buf, gopacket.Default, ethPacket); err != nil { log.Fatal(err) } // send the packet if err := sendPacket(buf.Bytes()); err != nil { log.Fatal(err) } }In this example, we create a new Ethernet packet and add an IPv4 layer and a TCP layer to it. We then serialize the packet and send it over the network using the `sendPacket` function. The go misc.packet Packet is part of the Go Packet library, which provides a set of tools for working with network packets.