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IPv6 Deployment in Academic Networks. Tim Chown University of Southampton, UK tjc@ecs.soton.ac.uk UK IPv6 Task Force seminars, 16 Jan 2003. Academic networking. Network availability is no longer just a “nicety” Networks are mission critical And so is the IP protocol that underpins them.

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Ipv6 deployment in academic networks

IPv6 Deploymentin Academic Networks

Tim Chown

University of Southampton, UK


UK IPv6 Task Force seminars, 16 Jan 2003

Academic networking
Academic networking

  • Network availability is no longer just a “nicety”

  • Networks are mission critical

    • And so is the IP protocol that underpins them.

  • Academic networks are and can be used for

    • Commercial university operation

    • Research projects

    • Wireless campuses

    • Remote learning

    • Collaborative working

    • Distributed computing (the Grid and E-Science)

The uk academic network
The UK academic network

  • Provides connectivity for

    • Over 200 universities

    • Over 400 further education colleges

  • The network is called JANET

    • The current instance is SuperJANET4

  • The “ISP” maintaining it is UKERNA

    • Provides additional services

      • e.g. Premium IP, IPv4 Multicast, H.323 conferencing

    • Can (within limits) deploy new services without a direct or immediate commercial benefit

Uk academic janet pilots
UK academic (JANET) pilots

  • Trials and pilots on JANET

  • Phase 1

    • Bermuda project, ATM PVCs, 1999-2000

  • Phase 2

    • SuperJANET4 removed ATM in favour of PoS networks

    • Tunnels to single pilot router, IPv6 over IPv4, 2001-2002

  • Phase 3

    • Dual-stack IPv4/IPv6 on the JANET core network, 2003

    • To commit, we need performance and reliability

    • Mustn’t adversely affect the IPv4 service

    • Must co-exist with IPv4 Multicast and IPv4 QoS.


  • A 12-month project run between three UK universities

    • Southampton, UCL and Lancaster

  • Tested IPv6 connectivity between ATM routers

    • IPv6 run over ATM PVCs, at 2Mbit/s

    • Static routing

  • Basic services run for validation:

    • DNS (BIND 9)

    • Web (Apache server, Mozilla client)

    • Email (Sendmail 8.10.x)

  • Produced five reports

    • Available still at www.ipv6.ac.uk

Dual stack strategy
Dual-stack strategy

  • NRENs need an IPv6 transition strategy

    • Need to be able to carry IPv6 on their infrastructure, and offer IPv6 services

  • Can run IPv4 and IPv6 on the same router equipment, and run both protocols over the same links, natively

    • Requires vendor implementation to have fast (hardware-based) IPv6 forwarding, and to support the required IPv6 routing protocols (BGP4+)

Dual stack deployments
Dual-stack deployments

  • The US research network, Abilene, has migrated to dual-stack, running both protocols

    • Initially using Cisco, now using Juniper routers

    • Running at up to 10Gbit/s

    • IPv6 forwarding tested to over 8Gbit/s

  • European National Research and Education Networks (NRENs) are following:

    • SURFnet (Netherlands), Renater (France), Funet (Finland) have all migrated already.

G ant and 6net

  • All the European NRENs are interconnected by GÉANT, offering a production IPv4 network service

    • Up to 10Gbit/s links, using Juniper routers

    • Planning to introduce dual-stack networking by mid-2003, following Abilene’s lead

    • Many NRENs planning in sync with GÉANT

  • GÉANT set new IPv6 Land Speed Record

  • 15 NRENs are members of the 6NET project

    • Has deployed a native IPv6-only network

    • Funded in part by the European Commission

The project
The project

  • Deployed a pan-European IPv6 research network

    • Backbone in place since May 2002 at STM-1 rates

  • Project runs until December 2004

    • 1,100 man months between 35 partner organisations

  • Many study areas beyond the basic network rollout:

    • Transition tools, MIPv6, DNS, QoS, address allocation policies, IPv6 multicast, IPsec, VPNs, multihoming, application porting, VoIP, Globus/GRID toolkit, multimedia tools, network management and monitoring,…

  • Desire to interconnect to international networks to further research goals through collaboration

Ipv6 address space
IPv6 address space

  • In Europe, IPv6 address space is allocated by the RIPE NCC

    • Most (all?) NRENs have a production IPv6 network address allocation (SubTLA)

    • The prefix is a /32, e.g. JANET is 2001:0630::/32

    • Each university site would receive a /48 prefix

    • Thus an NREN can address 2^16 universities

    • A site /48 prefix allows 2^16 site subnets to be allocated, with up to 2^64 (!) hosts per subnet

  • Address allocation policies will be important

International ipv6 routing
International IPv6 routing

  • Key international academic networks are now working together to get predictable, reliable international IPv6 networking.

    • Abilene

    • 6NET

    • Some NRENs (the Dutch, Finns, French)

    • Euro6IX (an ISP-oriented research network akin to 6NET)

    • WIDE (Japan)

  • Using dual-stack (native) transatlantic links

    • From Sweden, Netherlands

    • Phasing out long-haul IPv6-in-IPv4 tunnels

Vendor support
Vendor support

  • Hosts

    • *BSD, Linux, Windows 2000, XP, .NET, CE .NET, Solaris 8 and Solaris 9, Mac OS X (Jaguar), HP/UX (and Tru64 from Compaq), IBM AIX, Irix, …

  • Routers:

    • Cisco (IOS), Juniper (JUNOS), Hitachi, 6WIND, *BSD, Zebra (open source), ZebOS (by ipinfusion), Nortel Networks, MRTd, …

Wireless campus deployment
Wireless campus deployment

  • Growing numbers of students own laptops

  • PDA devices have Wireless LAN adaptors

  • Opportunity to deliver WLAN in campuses

    • Easy access to information

    • New channels to deliver material, location-aware

    • Ability to chat, or receive notifications

  • Mobile IPv6 enables campus-wide roaming

    • Much improved features over Mobile IPv4

Access into student homes
Access into student homes

  • Many student homes now have ADSL

    • And many of those homes have Wireless LAN

  • Many student halls have Ethernet

  • Can consider broadband applications

    • Conferencing between tutor and student

    • Delivery of multimedia data

    • File sharing

  • IPv4 home networking invariably uses NAT

    • Makes it hard to run applications into the home

    • IPv6 enables remote access for many applications

Ipv6 applications
IPv6 Applications

  • By deploying IPv6 we hope to promote

    • Peer-to-Peer (p2p) applications

    • Transparent end-to-end connectivity (no NAT, middleboxes)

    • New Grid and distributed computing functionality

    • New mobile features

    • Device to device communication

    • New classes of devices, e.g. remote sensor networks

  • There is no killer IPv6 application (yet…)

    • But the Web came many years after IPv4 was deployed

What will 2003 bring
What will 2003 bring?

  • GÉANT migration to dual-stack like Abilene

    • More NRENs also migrating

  • More vendor support

    • More features, better performance

  • Some IPv6 deployment in Wireless LANs

  • Stability in international IPv6 routing

  • Clearer transition scenarios from the IETF

  • Various phones with IPv6 embedded (for 3G)

  • New IPv6-enabled applications emerging

    • e.g. The Globus Toolkit for Grid

The end users
The end users…

  • The key is to bring the universities online

    • Transition strategies and cookbooks

    • Need carrots to attract large volumes of users

    • NRENs are making national networks IPv6-enabled

    • No mandate for universities to deploy

    • Early interest, like IPv4, will be in the CS departments

  • Show working examples

    • Site case studies, including DNS, email, www services…

  • Need to identify and tackle “missing pieces” for IPv6 academic deployment – underway in 6NET.

Sites to visit
Sites to visit

  • UK IPv6 Task Force

    • http://www.uk.ipv6tf.org/

  • 6NET

    • http://www.6net.org/

    • http://www.6net.org/publications/

  • IPv6 in UK academic sites

    • http://www.ipv6.ac.uk/

Backup slides

Backup slides

(not used on the night)

The ietf ipv6 related wgs
The IETF IPv6-related WGs

  • Has many IPv6-related working groups

    • IPv6 WG (was IPng)

    • V6 Ops WG (was ngtrans)

    • Mobile IP (for Mobile IPv6)

    • DHC WG (for DHCPv6)

    • DNSEXT (for IPv6 DNS)

  • Core standards have been available for 2-3 years

  • MIPv6 and DHCPv6 now finalising to RFC status

  • The IETF is now pushing IPv6 into all WGs

The m6bone
The m6bone

  • IPv6 Multicast protocols are being developed and implemented

  • Problem in deployment is similar to IPv4

    • Need IPv6 Multicast support in routers

    • Otherwise need to tunnel IPv6 Multicast in regular (unicast) IPv6 or IPv4 links

  • First international testbed is the m6bone

    • Centred on a router operated by Renater in Paris

    • http://www.m6bone.net