At the CEDEC 2015 conference in Japan, the volunteer network operations team provided a Wi-Fi network that was IPv6-only by default, without explicitly announcing it, in order to test apps and raise awareness of upcoming IPv6 requirements. Over 1,700 devices connected to the network, with 65% being Apple devices. While many devices worked with the IPv6-only network, some like Android phones could not connect due to lack of support for required IPv6 features. The unconventional network drew attention from game developers and raised awareness of supporting next-generation networks, with some starting to test their apps as a result. Traffic analysis found around 25% was IPv6, showing potential savings if mobile carriers deployed IPv6 networks.

1. Tried to Provide
IPv6 Only Network
Stealthily
at CEDEC 2015
Yuya Kawakami (@yuyarin)
CEDEC-Net 2015 NOC

2. CEDEC
• Largest conference in Japan for
computer entertainment developers
• 3 days at Pacifico Yokohama
• 6,373 attendees in 2015

3. CEDEC-Net
★ Connectable Wi-Fi network
★ Don't afraid failure, Have a sense of fun
★ Exchange between engineers in network
industry and game industry
praying NOC members
Wi-Fi Network for CEDEC by volunteers
Equipment provided by sponsors

4. # of Wi-Fi Stations
Max: 1713 stations
by Cisco Prime Infrastructure

5. Wi-Fi Users Attribute
Mobile devices are majority (visual)
65% Apple devices (MAC address)

6. At such a conference
IPv6 Only
by default
tried

7. Announcement of Wi-Fi
* dual-stack network(cedec-net4) is also prepared

8. Why great?
IPv6 only
for non-experts
stealthily
by default
provided a network with
maybe world first ?

9. Why did it?
WWDC 2015 - Your App and Next Generation Networks
https://developer.apple.com/videos/play/wwdc2015-719/
iOS App Store requires
"work with NAT64+DNS64"

10. CEDEC-Net 2015 External
FLET'S Hikari Next
(IPv6 Access NW)
cedec-net4
(IPv4+IPv6)
cedec-net
(IPv6)
(IPv6 ISP NW)
IPv6
Internet
IPv4
Internet
IPv6 IPoE
IPv6 traffic go
throught to the
IPv6 Intnernet
NAT64+DNS64
translate IPv6 packets
to IPv4 packets for IPv4
only applications
DS-Lite
encapsulate IPv4 packets
in IPv6 and translate
IPv4 private addresses to
global addresses in ISP
equipment
IPv6 Only!!

11. CEDEC-Net 2015 Overview

12. Devices work with IPv6 Only
Devices perfectly worked
Devices connected to Wi-Fi but couldn't
become "connected to the Internet"
– Mac & iPhone (65% share)
– Android
→ no support of DHCPv6
→ RDNSS should have been provided
– PS Vita
– Nintendo 3DS
https://en.wikipedia.org/wiki/Comparison_of_IPv6_support_in_operating_systems

13. Impact on Game Industry
• Announced "Wi-Fi network can be used as a
testbed for the future requirement of iOS
App submission" to them
• They noticed "Apps which cannot work with
this Wi-Fi will be rejected" and started to
verify their apps
• Article on CEDEC-Net was published on
GAME Watch and ranked 2th on a list of
popular articles
• We were asked to teach a procedure for
building NAT64+DNS64 environment

14. IPv6 Traffic
Download
Upload
avg. 25％ is IPv6 traffic

15. Devices in each network
IPv6 Only: Red
Dual-stack: Blue
almost same as share of Apple devices
If RDNSS is enabled, Android devices can be added
approx. 65％ Devices
works with IPv6 Only

16. DNS Query Stat
12M DNS queries counted by service providor
Top 10 providers account for 75%
* inc. 18K queries of ipv4only.arpa, Android uses for detect DNS64

17. DS-Lite Port Exhaustion
used 1 IPv6 address
(64512 ports) up
It was likely that there are devices who could not communicate.
1400 devices are connected at that time.
* differ from usage or implementation of CGN function
* specially configured CGN available with 64512 port

18. CGN Port can be exhausted: NAT is not a
permanent solution for IPv4 exhaustion
Apprx. 25% traffic can be released to IPv6 if
Mobile carriers deploy IPv6
It is important to try to make relationship
with non-Interet industries to promote IPv6
Lesson Learned
Content providers can decrease the risk of
discommunication if deploy IPv6
can save 25% CGN ports
but prepare for supporting them!!

19. iOS9.2 Release
https://developer.apple.com/library/ios/releasenotes/General/RN-iOSSDK-9.2/
The ability to synthesize NAT64 IPv6 addresses
from IPv4 literals was added to getaddrinfo
NAT64+DNS64 issue
Applications which need to use IPv4 address
literal like P2P application cannot work
Change in iOS9.2

20. For What is it Useful?
3 Mobile Careers in Japan
"Approach to Promote IPv6 in Mobile Network"
http://www.soumu.go.jp/main_content/000385655.pdf
Amount of traffic which can be move to IPv6 and a
number of IPv4 address which can be saved can be
calculated by data from CEDEC-Net 2015

21. Related Documents
• 『繋がりにくい原因』を探れ！ 〜CEDEC-Netテクニカルレビュー
2015〜
– https://cedil.cesa.or.jp/cedil_sessions/view/1323
– https://www.slideshare.net/yuyarin/cedecnet-2015
• Twitter @cedecnet のふぁぼ: 会場内外からの声
– https://twitter.com/cedecnet/favorites
• CEDEC-Net 2015 で IPv6 の会場ネットワークを提供してきました
– http://yuyarin.hatenablog.com/entry/2015/08/31/011205
• 「CEDEC-Net 2015」がiOSアプリ開発者に警鐘を鳴らす！
– http://game.watch.impress.co.jp/docs/news/
20150829_718619.html
• android が ipv4only.arpa. の AAAA を引く理由
– http://www.slideshare.net/twovs/192004-on-android