2015.5.6 deoknyong ko ([email protected]) network technology...
TRANSCRIPT
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2015.5.6
Deoknyong Ko ([email protected])
Broadband Tech Lab
Network Technology R&D Center
SKtelecom
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What’s the first things
that pops into your mind
when you hear the word, Korea?
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What’s the first things
that pops into your mind
when you hear the word, Korea?
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※ The Market Share of Mobile
Subscribers in Korea
SKtelecom
50.5% KT
LG U+
Wired Broadband Mobile Platform Semiconductor
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Background
IPv6 Transition Schemes
Contents
FAQ
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Background
IPv6 Transition Schemes
Contents
FAQ
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Summary of Applying IPv6
Subject Purpose Networks Transition Scheme
Date Subscribers
Wired Field Trial HFC, G-PON Dual Stack ’12.5.29 1 thousand
Wireless Commercial LTE Only IPv6 '14.9.25 670 thousands
IPv4 Networks
Dual Stack (IPv4/IPv6)
Only IPv6 Networks
IPv4 Networks
※ Subscribers by Jan. 2015
Only IPv6 Networks
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Why Did SKT Decide to Adopt IPv6 ?
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Why Did SKT Decide to Adopt IPv6 ?
CapEx for NAT equipment
※ Reference: http://www.google.com/intl/en/IPv6/index.html
∙ LTE device has 2 different IPv4 addresses by default in SKT. ∙ The number of connected device could exponentially increase.
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Difficult to operate duplicated networks
Why Did SKT Decide to Adopt IPv6 ?
NetworkA
NetworkB
NetworkA
NetworkB
PDN-GW#1
PublicNetwork
PDN-GW#2
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Korean government’s encouragement
Why Did SKT Decide to Adopt IPv6 ?
※ The statistics of IPv6 users. (http://6lab.cisco.com/stats)
United States
Norway
Germany
Belgium
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Which Networks to be migrated IPv6?
Applying IPv6 to only primary networks.
Legacy network will be replaced to LTE or G-PON.
Subject Networks Applying IPv6 Note
Wireless
LTE O Commercial
WCDMA X
Wi-Fi X
Wired
G-PON O Field Trial
HFC X
xDLS X
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Contents
Background
IPv6 Transition Schemes
FAQ
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Summary of IPv6 Transition Schemes
Subject Transition Schemes
Backbone Dual Stack
Access Networks (LTE EPC)
NAT64, 464XLAT
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Transition Scheme for Backbone
Dual stack can support both IPv4 and IPv6 access
networks.
There is no issue.
We don’t even need to apply Only-IPv6 to the
backbone.
Dual Stack(Backbone)
IPv4 Access Networks
(WCDMA, Wi-Fi)
IPv6Access Network
(LTE)
PublicNetwork
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Case#1: IPv6 is enabled on contents server
(End-to-End IPv6 connectivity)
Transition Scheme for Access Network
Case#2: IPv6 is not enabled on contents servers
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PDN-GW
Dual StackNetwork
LTE Device(Only IPv6)
Dual Stack
Only IPv6
Case#1: IPv6 is enabled on contents server
(End-to-End IPv6 connectivity)
Transition Scheme for Access Network (contd)
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Transition Scheme for Access Network (contd)
Case#2: IPv6 is not enabled on contents servers
PDN-GW
PublicNetwork
NAT64
DNS64
LTE Device(Only IPv6)
Only IPv4
Only IPv4
SKT should support that only-IPv6 subscribers can connect to
only-IPv4 contents server. NAT64, DNS64
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Algorithm of NAT64, DNS64
PDN-GW
PublicNetwork
NAT64
DNS64
LTE Device(IPv6-Only)
IPv4-Only
IPv4-Only
① Customer tries to connect to www.naver.com
② LTE device asks DNS64 server what is an IP address of www.naver.com
③ DNS64 server responds ‘64:ff9b::www.naver.com’
④ LTE device tries to connect to ‘64:ff9b::www.naver.com’
⑤ NAT64 translate IPv6 packet to IPv4 packet
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Drawback of NAT64 Algorithm
Some applications are Hard Coded as only IPv4
address instead of domain name.
∙ IPv6 LTE device doesn’t ask DNS64 server. ∙ Only IPv6 LTE device can’t interpret an IPv4 address.
Error occurred !!
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464XLAT Overview
RFC 6877, “464XLAT: Combination of stateful and
stateless translation” (Information Track)
Provided by Android OS by default
T-Mobile USA and SKT adopted
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464XLAT Architecture
464XLAT has two operations, CLAT and PLAT
Subject CLAT PLAT
Full Name Customer-side translator Provider-side translator
Location In cellphone In operator’s network
Translation IPv4 IPv6 IPv6 IPv4
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464XLAT Operation
Subject Interface Source Address
Data Packet
LTE Data Original
Allocated from P-GW (e.g. 2001:290::1)
CLAT “192.0.0.4” (dummy IPv4 address)
“LTE data interface ::464” (e.g. 2001:290::464)
Voice Packet
LTE IMS Allocated from P-GW (e.g. 2001:2b8::1)
LTE device has 3 outgoing interfaces
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464XLAT Operation (contd)
If android OS find a hard coded for IPv4 address(1.2.3.4),
android OS will transfer packet via CLAT interface.
CLAT PLAT
(5.6.7.8) Content Server
(1.2.3.4)
Src: 192.0.0.4 Dest: 1.2.3.4
Src: 2001:290::464 Dest: 64:ff9b::1.2.3.4
Src: 2001:290::464 Dest: 64:ff9b::1.2.3.4
Src: 5.6.7.8 Dest: 1.2.3.4
Src: 5.6.7.8 Dest: 1.2.3.4
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Verify 464XLAT Schemes
Verified 15 hundreds applications while
preparing the commercial service.
A few applications have trouble due to
customer’s circumstance.
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Background
IPv6 Transition Schemes
Contents
FAQ
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Which handset OSs and models are
supported an IPv6 service?
∙ We applied to only android OS not iOS.
∙ We applied to Galaxy Note 4 first. (‘14.9.24)
∙ We have applied to all new devices including
tablet since then.
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Do you support IMS service(VoLTE)
also?
∙ Of course.
∙ We support an IPv6 service of LTE Data
and LTE Voice.
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Do you support international
roaming service?
∙ Not yet.
∙ We don’t have a plan to launch now.
Do you support Wi-Fi service?
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Do you support tethering service?
∙ Yes.
∙ LTE device allocates an IPv4 address not
IPv6 address to laptop.
LTE Device(IPv6 Address)Laptop
(IPv4 Address)
PublicIPv6 Network
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Do you satisfy the quality of IPv6
data and IMS service compared to
IPv4 ?
∙ Yes.
∙ We can’t find the quality difference
between IPv4 and IPv6 service.
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Can I know about the increase of
IPv6 users and IP deployment since
commercial service ?
∙ I’m sorry but, I can’t inform that.
∙ IPv6 users and the CapEx for IP deployment
are restricted document.
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Can I know about the increase of
IPv6 traffic since commercial service
?
∙ Recent IP equipment(ex> Router, P-GW) can’t
distinguish between IPv4 traffic and IPv6
traffic.
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Do you inform your customers that
they are serviced by IPv6 ?
∙ No.
∙ Our aim is that our customer can’t
recognize which service is provided.
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Do you launch the new BM based on
IPv6 ?
∙ Yes.
∙ We are developing IoT which is capable
of end-to-end IPv6 connection.
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