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Authors:
James F. Kurose, Keith W. Ross
Chapter:
The Network Layer
Exercise:
Review
Question:19 | ISBN:9780132856201 | Edition: 6

Question

Compare and contrast the IPv4 and the IPv6 header fields. Do they have any fields in common?

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Answer

IPv6 has a fixed length header, which does not include most of the options an IPv4 header can include. Even though the IPv6 header contains two 128 bit addresses (source and destination IP address) the whole header has a fixed length of 40 bytes only. Several of the fields are similar in spirit. Traffic class, payload length, next header and hop limit in IPv6 are respectively similar to type of service, datagram length, upper-layer protocol and time to live in IPv4.

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