Upgrading and Repairing Networks (5th Edition)

IPv4 has been in use for more than 10 years now, and although most of the address-space issues have been resolved, there will come a time when the usefulness and flexibility of IPv6 becomes more and more important. There are many enhancements to IPv6 that might warrant its implementation in your network. If your network hasn't yet adopted IPv6, you can bet that eventually it will.