Lec 10 IP V6 3.1 Computer Networks Al-Mustansiryah University Elec. Eng. Department College of Engineering Fourth Year Class Lec 10 IP V6 3.1

3-2 IPv6 ADDRESSES Despite all short-term solutions, address depletion is still a long-term problem for the Internet. This and other problems in the IP protocol itself have been the motivation for IPv5. 3.2

Features of IPv6 Larger Address Space Efficient and Extensible IP datagram Security 3.3

Major Improvements of IPv6 Header No option field: Replaced by extension header. Result in a fixed length, 40-byte IP header. No header checksum: Result in fast processing. No fragmentation at intermediate nodes: Result in fast IP forwarding. 3.4

An IPv6 address is 128 bits long. Figure 3.14 IPv6 address in binary and hexadecimal colon notation 3.5

128-bit IPv6 Address 3FFE:085B:1F1F:0000:0000:0000:00A9:1234 8 groups of 16-bit hexadecimal numbers separated by “:” Leading zeros can be removed 3FFE:85B:1F1F::A9:1234 :: = all zeros in one or more group of 16-bit hexadecimal numbers 3.6

Figure 3.15 Abbreviated IPv6 addresses 3.7

Example 3.12 Expand the address 0:15::1:12:1213 to its original. Solution We first need to align the left side of the double colon to the left of the original pattern and the right side of the double colon to the right of the original pattern to find how many 0s we need to replace the double colon. This means that the original address is. 3.8