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Large address space
- The 128-bit address space for IPv6 provides ample room to provide every device on the present and foreseeable future Internet with a globally reachable address.
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Efficient routing
- With a streamlined IPv6 header and addressing that supports hierarchical routing infrastructures, IPv6 routers on the Internet can forward IPv6 traffic faster than their IPv4 counterparts.
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Ease of configuration
- IPv6 hosts can configure themselves by either interacting with a Dynamic Host Configuration Protocol for IPv6 (DHCPv6) server or by interacting with their local router and using stateless address autoconfiguration.
- Enhanced security
- The IPv6 standards solve some of the security issues of IPv4 by providing better protection against address and port scanning attacks and by requiring that all IPv6 implementations support Internet Protocol security (IPSec) for cryptographic protection of IPv6 traffic.
Reference: http://technet.microsoft.com/en-us/library/bb878121.aspx
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