1.  Longer addresses, better security, & more  128-bit adresses (8 sets of four hex digits)  Fixed length (40-byte) header 5f1b:df00:0:155:a3:1:fed:118 Version Priority Flow Label Payload Length Hop LimitNext Header Source Address Destination Address  anycast address allows datagram to be delivered to any one of a group of hosts.  etc.

2. Europe -- IPv6 is commonly supported by ISPs. Asia -- widely supported, some IPv6-only nets North America & Australia -- little support among ISPs USA NASA has some deployment. DOD began 2003, end 2008. Internet2 operated on IPv6. Many universities Operative System Support -- Windows 2000/2003 server/XP -- Linux (since 2.1.8) -- freeBSD, OpenBSD, NetBSD -- AIX 4.3, HP/UX 11.i, Solaris 8 & after, OSX

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