1. A Model of IPv6 Internet Access Service via L2TPv2 Shin Miyakawa NTT Communications miyakawa@nttv6.jp 2006/7/10 IETF66th

2. Model of IPv6 Internet Access Service via L2TPv2 Tunnel draft-kuwabara-softwire-ipv6-via-l2tpv2- 00.txt English translation of the NTT Communications’ L2TP (v6 over v4) service specification Original (Japanese text) is at http://www.ocn.v6.ntt.net/ocnipv6/pdf/ocni pv6uni_ver1.0.pdf

3. Appendix

4. IPv6 IPv4 OCN IPv6: IPv6 Emulation for Consumer Customers Launched in December 2005 IPv6 Tunneling over IPv4 by L2TP Fixed IP address and non-fixed IP address to be given (two /64 subnet prefixes) Original tunneling software provided for subscribers RadiusMail/WebProxy IPv6 Tunneling Termination Unit L2TP ， UDP Implemented “OCN IPv6” tunnel service

5. price About $3 USD per month for OCN TM users About $5 USD per month for others –Two dollars for “OCN Club” membership

6. CPE Such as ADSL router PC LAN upstream DHCP (v4) L2TP (v6 over v4) L2TP client Host mode

7. CPE Such as ADSL router Router LAN upstream DHCP (v4) L2TP (v6 over v4) L2TP client Router mode Router Advertise

8. CPE Such as ADSL router Router LAN upstream DHCP (v4) L2TP (v6 over v4) L2TP client Router mode with 2 nd LAN 2 nd LAN RA

9. Architecture (Host Mode) IPv6 networkIPv4 network Client as L2TP LAC L2TP LAS RADIUS IPv6 IPv4 L2TP IPv6 application Link local DHCPv6 PD Client OS assigns a global address from the delegated prefix to a Virtual I/F Global Address by RA DHCPv6 PD ?

10. Architecture (Router Mode) IPv6 Network (LAN) IPv6 networkIPv4 network Client as L2TP LAC L2TP LAS RADIUS Link local DHCPv6 PD Global Address by RA DHCPv6 PD ? RA assigns the first (!) /64 to this link IPv6 IPv4 L2TP IPv6 application

11. “OCN IPv6 Mobile GW” Service HTTP Reverse Proxy service –It receives IPv4 HTTP communication and re-transmit as IPv6 HTTP Also it provides DNS service which is associated to the reverse proxy Now in the experimental service for free only for “OCN IPv6” users http://ocnipv6.jp/

12. IPv6 network DB IPv4 network Web I/F to DNS record DNS HTTP Reverse Proxy v4 only http client v6 only www DNS query for A of www R. Proxy’s Address as “A” record of www HTTP session “AAAA” record of www HTTP session DNS query for AAAA of www

13. “apaconf” tool Configure v6 compatible apache http server on an IPv6 ready Windows XP SP2 with “fixed prefix” of “OCN IPv6” tunnel service to create v6 only www server on the PC which is accessible not just only from v6 world but also from v4 world via the reverse proxy So, today’s cellular phone network service such as “i- Mode” (by DoCoMo) also can be accessible to the web

14. application example CPE (NAT) v4 Internet v6 Internet L2TP R. Proxy PC /w L2TP Client & v6 www appliance /w v4 HTTP i/f Such as HDD Recorder Establish v6 connectivity to the PC v4 http access v6 http access This www configured as proxy v4 http access