Understanding IPv6 by Youngsong Mun
Covers the basic materials and up-to-date information to understand IPv6, including site local address often overlooked by most other books about IPv6 do not reflect this important fact.
Highlights Teredo, a transistion tool that permits web sites using two different protocols to interact, with complete-chapter coverage..
Since popular applications such as web service can not be operated without DNS. Chapter 9 covers modifications in DNS for IPv6 which other books rarely cover.
Other topics covered that make it a most up-to-date and valuable resource: hierarchical mobility management, fast handoff, and security features such as VPN traversal and firewall traversal.