1 IPv6 2 Christian Huitema, 1997 3 IPv6 4 IPv6 IPv4 IPv6 IPv6 5 IPv6 IPv6 IPv4 IPv6 6 IPv6 7 iNET ’92 /16 B IPv4 8 IPv4 A -- /8 B -- /16 C -- /24 1994 IETF IPv4 2008 3 NAT IP IPng (next generation) SIP, TP/IX, PIP, TUBA SIP + PIP IPv6 9 IPv6 10 ALG (Application Level Gateway) 11 12 NAT/Firewall Web 13 IPv6 NAT/Firewall PC 14 IPv6 IPv6 15 (1) 16 IPv4 Web .... 17 IPv6 (1) IPv6 IPv6 IPv4: 232 = 43 (1