layer

type ARP struct {
	SenderMAC net.HardwareAddr
	SenderIP  net.IP
	TargetMAC net.HardwareAddr
	TargetIP  net.IP
	Opcode    uint8
}

type IPv4 struct {
	Identification uint16
	Flags          uint16
	TTL            uint8
	Protocol       uint8
	Checksum       uint16
	Source         net.IP
	Destination    net.IP
	Data           []byte
}

type UDP struct {
	SrcPort uint16
	DstPort uint16
	Data    []byte
}