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Cisco Secure Firewall Services Module (FWSM) by Arvind CCIE No. 7016 Durai, Ray CCIE No. 7050 Blair

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Chapter 19 IP Version 6

IP version 6 (IPv6) has come to prominence because of the extensive use of the Internet. The current address, IPv4, is predominantly deployed and extensively used throughout the world. When IPv4 was designed, Internet usage and growth to this extent was not predicted. The main feature of IPv6 that is driving adoption today is the larger address space: addresses in IPv6 are 128 bits long compared to 32 bits in IPv4.

The 32 bits in IPv4 have 232(4,294,967,296) unique IP addresses. In IPv6, the address space has 128 bits. The total number of unique IP addresses for IPv6 is 2128; that is, 340,282,366,920,938,463,463,374,607,431,770,000,000 addresses.

For a device to be IPv6 compatible, the machine needs to have an IPv6 stack. ...

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