IP Packet Fields 4/5
nHeader Checksum: Adds all the 16 bit fields of the header using 1’s
complement and then obtains the inverse. Can be set to all 0’s if underlying subnet uses error detection.
nSource IP Address: 32 bits
nDestination IP Address: 32 bits
nOptions: Can be used to enhance the capability of IP. Must be a multiple of
4 bytes,if not padding used. Allows the following: