Ip datagram header format, Computer Network Security

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IP DATAGRAM HEADER FORMAT:

It is given in the figure below:

823_IP DATAGRAM HEADER FORMAT.png

In the table:

VERS denotes the version of IP.
H.LEN denotes the header length in units of 32-bits.
SERVICE TYPE denotes sender's preference for low latency, high reliability that is rarely needed.
TOTAL LENGTH denotes total octets in datagram.
IDENT, FLAGS, FRAGMENT OFFSET denotes the values used with fragmentation.
TTL denotes time to live decremented in each router; datagram discarded when TTL = 0.
TYPE denotes type of protocol carried in table e.g., TCP, UDP.
HEADER CHECKSUM denotes 1's complement of 1's complement sum.

SOURCE DIST IP ADDRESS denotes IP addresses of original source and ultimate

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