IPv6 over Broadband Service Models

1Copyright © 2003 Juniper Networks, Inc. Proprietary and Confidentialwww.juniper.net

Mark Williams 魏迈凯Academic Networking Liaison,

Asia Pacific

[email protected]

IPv6 IPv6 over Broadband over Broadband Service ModelsService Models


IPv6 over Broadband Services – IPv6 over Broadband Services – Target Market and Service Target Market and Service

RequirementsRequirements

Carriers in APAC want to run IPv6 across their broadband networks

Most interest so far in Japan due to Government technology push &

funding for IPv6 development

Interest is also growing in other APAC countries including Korea,

India, China, Taiwan, etc.

There have emerged Two IPv6 over Broadband standards :

NTT Com, ACCA, KDDI etc in Japan are running or trialling PPP

based IPv4 and IPv6 “Dual Stack” BRAS

NTT East / West / SI Labs is building a whole new nationwide

network and they want Non-PPP based services.


Technical Service Technical Service Details for IPv4Details for IPv4

• PPP-Based ServicesPPP-Based Services• Non PPP-Based ServicesNon PPP-Based Services


IPv4 StandardsIPv4 Standards

• Business broadband – generally uses Bridged or Routed 1483 for static, always-on service models.

• Subscriber services are based on either PPPoE or DHCP.

• Point to Point Protocol over Ethernet (PPPoE) based on PPP, extended by RFC 2516

• Dynamic Host Configuration Protocol (DHCP) is based on work in BootP, extended by RFC 1541, usually implemented as compliant to RFC 2131.


Protocol Design IntentionsProtocol Design Intentions

• PPPoE• PPPoE is designed to establish a WAN

connection to a remote client. PPPoE extends PPP to Ethernet, providing for authentication, authorization, accounting and network layer configuration.

• DHCP• DHCP is designed to supply DHCP clients

(usually in a broadcast domain i.e. LAN) with network configuration parameters.


Summary - IPv4 BRAS Service Summary - IPv4 BRAS Service ModelsModels

PPP-based model

• Requires PPPoE client software or CPE device

• Session based service model

• User authentication & accounting information present

• Radius based AAA• Leverages LCP and IPCP

protocols

Non PPP-based model• Business services

• Bridged / Routed 1483 services

• Subscriber Services • DHCP based broadband

remote access• Good for lightweight

clients• Requires many add-ins to

DHCP to allow AAA, session monitoring, accounting, etc etc etc etc….


IPv6 over BroadbandIPv6 over BroadbandTechnical Service DetailsTechnical Service Details



Carrier IPv4 and IPv6

NetworkLayer 2 Access

The PPPoE Dual StackThe PPPoE Dual Stack

VC or VLAN

IPv4 and / or IPv6 devices

Layer 2 or Layer 3 CPE

device

ERX IPv4/IPv6 Edge Router

RADIUS

Simultaneous Support for IPv4 and IPv6 traffic over a single PPP connection


““Dual StackDual Stack”” PProtocolrotocol LayersLayers

PPPoE or PPPoA

PPP

IPv4 IPv6

IPv4 Applications

IPv6 Applications

Based on PPP(oX)

One PPP Session

Two Layer 3 Protocols

ATM or Ethernet

}


More detail – IPv4 Connection More detail – IPv4 Connection SetupSetup

PPPoE or PPPoA

PPP / LCP

IPv4 / IPCP

NCP - IPCP used for :• IP address assignment – via Local pools or Radius• DNS Server addresses, etc• etc

ATM or Ethernet

PPP - LCP used for :• user authentication • connection establishment • connection maintenance / monitoring


Notes about IPv6 Connection Notes about IPv6 Connection setup:setup:

NCP – IPv6CP used only for exchange of Link-Local addresses - not much use at all in a BRAS environment.

JunosE development started in 2002 while specifications were Internet Drafts but they are now RFCs :

DHCPv6 – draft-ietf-dhc-dhcp6-26.txt RFC 3315

draft-troan-dhcpv6-opt-prefix-delegation-01.txt RFC 3633

draft-ietf-dhc-dhcpv6-opt-dnsconfig-03 RFC 3646


Carrier IPv4 and

IPv6 Network

Layer 2

Access

How else can the PPPoE model be How else can the PPPoE model be used ?used ?

VC or VLAN


Layer 2 CPE device


• Native Client device support for both IPv4 and IPv6 over single PPP stack

•Eg - simply extend the existing Windows XP PPPoE client to support IPv6

•Eg Windows “VISTA” 2007?


Technical Service Technical Service DetailsDetails



Carrier IPv4 and

IPv6 Network

Layer 2

Access

The Non-PPP modelThe Non-PPP model

Prefixes statically provisioned on user facing interface (VC / VLAN) DHCP-PD and opt-DNS could also be used without PPP ND / RA could also be used to advertise prefixes over Ethernet access

How to do DNS in this case ?

Less protocol overhead due to no PPP – BUT – bit of a drag due to lost functionality (user auth, accounting, session monitoring, etc)

VC or VLAN


Layer 2 or Layer 3 CPE

device



Carrier IPv4 and

IPv6 Network

Layer 2

Access

Prefix Assignment in the Non-PPP Prefix Assignment in the Non-PPP modelmodel

- Layer 3 CPE Case - Layer 3 CPE Case

VC or VLAN


Layer 3 CPE device

ERX IPv4/IPv6

Edge Router

•IPv6 connection setup : • DHCP-PD & Opt-DNS – directly over Ethernet

•IPv4 connection setup : • PPPoE

• ND / RA• (requires gateway

router to be a DNS Proxy )


Layer 3 CPE - DetailsLayer 3 CPE - Details

Prefixes statically provisioned on the BRAS One Prefix per access subinterface (VC / VLAN)

DHCP-PD and opt-DNS used between BRAS and CPE router CPE initiates DHCPv6 exchange to BRAS

Requests IPv6 Prefix via DHCP-PD Requests DNSv6 info via Opt-DNS

BRAS responds with configured values ND / RA used to assign IPv6 addresses to IPv6 devices behind

CPE Router.


Carrier IPv4 and

IPv6 Network

Layer 2

Access

Prefix Assignment in the Non-PPP Prefix Assignment in the Non-PPP modelmodel

- Layer - Layer 22 CPE Case CPE Case

VC or VLAN


Layer 2 CPE device


• Neighbor Discovery• Router Advertisement

• (some sort of DNS info exchange?)


IPv6 BRAS Service Model IPv6 BRAS Service Model SummarySummary

• PPP based• Requires Dual Stack

(IPv4/v6) PPPoE client or device

• Session based service model

• User authentication & accounting information present

• Radius based AAA• Leverages DHCP-PD

and opt-DNS

• Non PPP-based

• DHCP-PD or ND/RA can be used in the access network

• No native authentication or accounting

• More suitable to “always-on” service


IPv6 ServicesIPv6 Servicesand Productsand ProductsIn Use TodayIn Use Today


Broadband Access

Juniper IPv6 Firewall and B-RASJuniper IPv6 Firewall and B-RAS


NS 5XTIPv6 CPE Firewall

PPPoE

PPP

IPv4 IPv6

ATM VC or Ethernet VLAN

•One Circuit

•2 Network Protocols

ERX IPv4/IPv6 B-RAS

IPv4 / IPv6 Firewall &

VPN platform

IPv4

IPv6

DHCP-PD or NeighborDiscovery





References in IPv6 Network References in IPv6 Network EngineeringEngineering

• GEANT V6 task force

• http://www.join.uni-muenster.de/geantv6/

• DANTE:

• www.dante.net/nep/ipv6/index.html


IPv6 Network ReferencesIPv6 Network References

GEANT IPv6 Test Program: http://www.juniper.net/news/pressreleases/2001/pr-011128.html

ESNET / 6TAP at PAIX: http://www.juniper.net/news/pressreleases/2001/pr-011128.html

France Telecom / VTHD: http://www.juniper.net/news/pressreleases/2001/pr-011128.html

CSC / FUNET: http://www.juniper.net/news/pressreleases/2002/pr-020507.html

Internet2 / Abilene: http://archives.internet2.edu/guest/archives/I2-NEWS/log200204/msg00003.html

Canarie / CA*net 4: http://www.juniper.net/news/pressreleases/2002/pr-020710.html

ESNET: http://www.juniper.net/news/pressreleases/2002/pr-020828.html

ARNES, DANTE, and REDiris: http://www.juniper.net/news/pressreleases/2002/pr-021003.htmlhttp://archives.internet2.edu:8080/guest/archives/I2-NEWS/log200210/msg00005.html

Internet2 Gigapops: http://www.juniper.net/news/pressreleases/2002/pr-021111.html

Japan Gigabit Network: http://www.juniper.net/news/pressreleases/2002/pr-021112.html

Chunghwa Telecom HiNet: http://www.juniper.net/news/pressreleases/2003/pr-030114.html

NTT Communications: http://www.juniper.net/company/presscenter/pr/2003/pr-030218a.html

http://www.juniper.net/news/pressreleases/2001/pr-011128.html




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IPv6 over Broadband Service Models