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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/ocnipv6uni_ver1.0.pdf
Appendix
IPv6
IPv4
OCN IPv6: IPv6 Emulation for Consumer Customers
Launched in December 2005IPv6 Tunneling over IPv4 by L2TPFixed IP address and non-fixed IP address to be given
(two /64 subnet prefixes)Original tunneling software provided for subscribers
Radius Mail/Web Proxy
IPv6 Tunneling
Termination UnitL2TP, UDP Implemented
“OCN IPv6” tunnel service
price
• About $3 USD per month for OCNTM users
• About $5 USD per month for others– Two dollars for “OCN Club” membership
CPESuch as
ADSL router
PC
LANupstream DHCP
(v4)
L2TP (v6 over v4)
L2TPclient
Host mode
CPESuch as
ADSL router
Router
LANupstream DHCP
(v4)
L2TP (v6 over v4)
L2TPclient
Router mode
Router Advertise
CPESuch as
ADSL router
Router
LANupstream DHCP
(v4)
L2TP (v6 over v4)
L2TPclient
Router mode with 2nd LAN
2nd LANRA
Architecture (Host Mode)
IPv6 network IPv4 networkClient
asL2TPLAC
L2TPLAS
RADIUS
IPv6 IPv6
IPv4L2TP
IPv6application
Link localDHCPv6 PD
Client OS assignsa global addressfrom the delegatedprefix to a Virtual I/F
Global Address by RADHCPv6 PD ?
Architecture (Router Mode)
IPv6Network(LAN)
IPv6 network IPv4 networkClient
asL2TPLAC
L2TPLAS
RADIUS
Link localDHCPv6 PD
Global Address by RADHCPv6 PD ?
RA assignsthe first (!) /64 to this link
IPv6 IPv6
IPv4L2TP
IPv6 IPv6application
“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/
IPv6network
DBIPv4
network
Web I/F toDNS record
DNS
HTTPReverse
Proxy
v4 onlyhttp client
v6only www
DNS queryfor A of wwwR. Proxy’s
Addressas“A” recordof www
HTTPsession
“AAAA” record of www
HTTPsession
DNS query for AAAA of www
“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
application example
CPE(NAT)
v4 Internet v6 InternetL2TP
R. Proxy
PC /wL2TP Client &
v6 www
appliance/w v4 HTTP i/f
Such as HDD Recorder
Establish v6 connectivity to the PC
v4 httpaccess
v6 httpaccess
This wwwconfigured as proxy
v4 httpaccess