Pcap packets, the ones that were retrieved using libpcap library, also maintain a reference to a separate
PcapHeader class. The baseclass
JPacket abstracts that information away using a
JCaptureHeader interface, but it is also possible to work directly with the
PcapHeader class. It is peered with native C structure defined in libpcap library itself
struct pcap_pkthdr. It provides information such as packet captured length, original length and capture timestamp.
Most user's do not need to deal with this detail and is sufficient to work with