Appendix: DLC, IP, TCP, UDP Headers

DLC_header:     14 bytes for Ethernet
    Destination MAC:    6 bytes
    Source MAC:         6 bytes
    Eithertype:         2 bytes

IP_header:      20 bytes 
    Version+hdr_length: 1 byte
    Type:               1 byte
    Total length:       2 bytes
    Identification:     2 bytes
    Flag+Offset:        2 bytes
    Time to live:       1 byte
    Protocol:           1 byte
    CheckSum:           2 bytes
    Source IPaddr:      4 bytes
    Destination IPaddr: 4 bytes

TCP_header:     20 bytes
    Source Port:        2 bytes
    Destination Port:   2 bytes
    Sequence Number:    4 bytes
    Acknowledge Number: 4 bytes
    Data offset:        1 byte
    Flag:               1 byte
    Window:             2 bytes
    CheckSum:           2 bytes
    Option:             2 bytes

UDP_header:     8 bytes
    Source Port:        2 bytes
    Destination Port:   2 bytes
    Length:             2 bytes
    CheckSum:           2 bytes
Sun Sparc running
Solaris 2.4
IBM Thinkpad:
MS TCP/IP on Windows 95