IPv6 Transition Strategies - apricot

49 Pages·2013·0.99 MB·English

by  Philip Smith

IPv6 Transition Strategies
Philip Smith
<[email protected]>
APRICOT 2013
Singapore
19th Feb – 1st March 2013
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Presentation Slides
Will be available on
p 
http://thyme.apnic.net/ftp/seminars/
n 
APRICOT2013-IPv6-Transition.pdf
And on the APRICOT 2013 website
n 
Feel free to ask questions any time
p
Introduction
Why should we care?
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“The times, They are a’ changin’”
IPv4 All Gone!
Source: ipv4.potaroo.net (Feb 2011)
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Is IPv4 really running out?
Yes!
p 
IANA IPv4 free pool ran out on 3rd February
n 
2011
RIR IPv4 free pool will run out soon after
n 
www.potaroo.net/tools/ipv4/
n 
(depends on RIR soft-landing policies)
p 
The runout gadgets and widgets are
p 
now watching when the RIR pools will
run out:
inetcore.com/project/ipv4ec/index_en.html
n 
ipv6.he.net/statistics/
n 
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Strategies available for Network
Operators
Do nothing
1. 
Wait and see what competitors do
n 
Business not growing, so don’t care what happens
n 
Extend life of IPv4
2. 
Force customers to NAT
n 
Buy IPv4 address space on the marketplace
n 
Deploy IPv6
3. 
Dual-stack infrastructure
n 
IPv6 and NATed IPv4 for customers
n 
6rd (Rapid Deploy) with native or NATed IPv4 for
n 
customers
Or various other combinations of IPv6, IPv4 and NAT
n 
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Definition of Terms
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Dual-Stack Networks
Both IPv4 and IPv6 have been fully deployed
p 
across all the infrastructure
Routing protocols handle IPv4 and IPv6
n 
Content, application, and services available on IPv4 and
n 
IPv6
End-users use dual-stack network transparently:
p 
If DNS returns IPv6 address for domain name query,
n 
IPv6 transport is used
If no IPv6 address returned, DNS is queried for IPv4
n 
address, and IPv4 transport is used instead
It is envisaged that the Internet will operate dual-
p 
stack for many years to come
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IP in IP Tunnels
A mechanism whereby an IP packet from one
p 
address family is encapsulated in an IP packet
from another address family
Enables the original packet to be transported over
n 
network of another address family
Allows ISP to provide dual-stack service prior to
p 
completing infrastructure deployment
Tunnelling techniques include:
p 
IPinIP, GRE, 6to4, Teredo, ISATAP, 6rd, MPLS
n 
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Address Family Translation (AFT)
Refers to translation of IP address from
p 
one address family into another address
family
e.g. IPv6 to IPv4 translation (sometimes called
n 
NAT64)
Or IPv4 to IPv6 translation (sometimes called
n 
NAT46)
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