Migration from IPv4 to IPv6 Interoperability with IP v4 is necessary for gradual deployment Two complementary mechanisms: >)dual stack operation: IP v6 nodes support both address types > tunneling: tunnel IP v6 packets through IP v4 clouds Alternative is to create IPv6 islands, e.g corporate networks >) Use of form of nat to connect to the outside world )) NAT must not only translate addresses but also translate between IPv4 and IPv6 protocols 1
11 Migration from IPv4 to IPv6 Interoperability with IP v4 is necessary for gradual deployment. Two complementary mechanisms: » dual stack operation: IP v6 nodes support both address types » tunneling: tunnel IP v6 packets through IP v4 clouds Alternative is to create IPv6 islands, e.g. corporate networks, ... » Use of form of NAT to connect to the outside world » NAT must not only translate addresses but also translate between IPv4 and IPv6 protocols
IPv6 Discussion IPv4 Infrastructure got better 》 Address efficiency >)Co-opted IPv 6 ideas: IPSec, diffserv, autoconfiguration via DHCP etc Massive challenge > Huge installed base of IPv4-speaking devices 》 Chicken& Egg problem Who' s the first person to go IPv6-only? Steady progress in deployment. >)Most hosts big routers support > Long-term: The little dev ices will probably force IPv6 Used now on many mobile phones in Japan 12
12 IPv6 Discussion IPv4 Infrastructure got better » Address efficiency » Co-opted IPv6 ideas: IPSec, diffserv, autoconfiguration via DHCP, etc. Massive challenge » Huge installed base of IPv4-speaking devices » Chicken & Egg problem – Who’s the first person to go IPv6-only? Steady progress in deployment. » Most hosts & big routers support. » Long-term: The little devices will probably force IPv6 – Used now on many mobile phones in Japan