IPv6 Transition.pdf

(1732 KB) Pobierz
IPv6 Transition
Leo T. Chiang
E-Mail: tt_chiang@ringline.com.tw
P.1
813354102.002.png
Transition Assumptions
No “ Flag Day ”
– Last Internet transition was 1983 (NCP
TCP)
Transition will be incremental
– Possibly over several years
No IPv4/IPv6 barriers at any time
No transition dependencies
– No requirement of node X before node Y
Must be easy for end user
– Transition from IPv4 to dual stack must not break anything
IPv6 is designed with transition in mind
– Assumption of IPv4/IPv6 coexistence
Many different transition technologies are A Good
Thing ™
–“ Transition toolbox ” to apply to myriad unique situations
P.2
813354102.003.png
Transition Planning
• Assumption: Existing IPv4 network
• Easy Does It
– Deploy IPv6 incrementally, carefully
• Have a master plan
• Think IPv4/IPv6 interoperability, not migration
• Evaluate hardware support
• Evaluate application porting
• Monitor IETF ngtrans WG
P.3
813354102.004.png
Transition Strategies
Edge-to-core
– The edge is the killer app!
– When services are important
– When addresses are scarce
– User (customer) driven
Core-to-edge
– Good ISP strategy
By routing protocol area
– When areas are small enough
By subnet
– Probably too incremental
P.4
813354102.005.png
IPv4-IPv6 Transition / Co-Existence
A wide range of techniques have been identified and
implemented, basically falling into three categories:
– (1) Dual-stack techniques, to allow IPv4 and IPv6 to
co-exist in the same devices and networks
– (2) Tunneling techniques, to avoid order dependencies
when upgrading hosts, routers, or regions
– (3) Translation techniques, to allow IPv6-only devices to
communicate with IPv4-only devices
Expect all of these to be used, in combination
P.5
813354102.001.png

Plik z chomika:

Inne pliki z tego folderu:

Inne foldery tego chomika:

Zgłoś jeśli naruszono regulamin