Table 3. IP Header Fields and Classifications

IP Field            Size (bits)      Class

Version                         4                    Static-Known

Header Length                   4                    Static-Known

Type of Service                 8                    Changing

Packet Length                  16                    Inferred

Id                             16                    Changing

Reserved Flag                   1                    Static-Known

May Fragment Flag               1                    Inferred

Last Fragment Flag              1                    Static-Known

Fragment Offset                13                    Static-Known

Time To Live                    8                    Changing

Protocol                        8                    Static-Known

Header Checksum                16                    Inferred

Source Address                 32                    Static-Def

Destination Address            32                    Static-Def