IPV6 IN MOBILE NETWORKS

Transcription

1 IPV6 IN MOBILE NETWORKS APNIC37 - TUTORIAL PRESENTATION TUESDAY 25/02/2014 TELSTRA TEMPLATE 4X3 BLUE BETA TELPPTV4 Sunny Yeung Senior Technology Specialist Telstra Wireless Data Engineering

2 AGENDA 1. Why IPv6? 2. 3GPP Definitions 3. Current Wireless Architectures 4. IPv6 in Wireless Architectures 5. Transition Methods 6. Setup and Testing 7. Configurations and Settings 8. Solution testing and results 9. Considerations 10. Q&A IPv6 in Mobile Networks Sunny Yeung 02/2014 2

3 WHY IPV6? Drivers for IPv6 Exponential Growth in mobile data traffic. Growth in the number of mobile user equipment. New devices are session hungry, consuming multiple IP and ports. Projected uptake of Sensor-Networks using 6LoWPAN and Machine to Machine (M2M) communications. IPv4 Public run out : Most operators started to deploy NAT44 very early on either on Internet gateways or dedicated devices. IPv4 Private run out : APN IP Address pools. Reuse subnets if/where possible. Offload the NAT44 Architecture. Provider-hosted IPv6 services/content that can reduce private IPv4 address usage - (VoLTE/IMS) Remember - The use of IPv6 services should be invisible to the end-user. IPv6 in Mobile Networks Sunny Yeung 02/2014 3

4 WIRELESS DEFINITIONS IPv6 in Mobile Networks Sunny Yeung 02/2014 4

5 WIRELESS DEFINITIONS UE User Equipment This is the end-user equipment where it can be an IPv6 enabled USB dongle or Smartphone. It is expected the OS is fully IPv6 compliant. Wireless networks are based on GPRS core networking which allows 2G, 3G, WCDMA, LTE mobile networks to transmit IP packets to external networks such as the Internet. SGSN Serving GPRS support node / MME An SGSN is responsible for the delivery of data packets from and to the mobile stations within its geographical service area. It performs functions such as packet routing and transfer, tunnel/detunnel downlink/uplink packets towards the RNC, and carry out mobility management for connected nodes. GGSN Gateway GPRS support node / PGW The GGSN is the main component of the GPRS network. It is responsible for internetworking between the GPRS network and the external network, such as the internet. From the internet s perspective, the GGSN is a router to a sub-network as it hides the GPRS network infrastructure behind the GGSN. IPv6 in Mobile Networks Sunny Yeung 02/2014 5

6 WIRELESS DEFINITIONS RNC Radio Network Controller The RNC controls the NodeBs, (Radio Towers), performs radio resource management, congestion controls, and delivers voice traffic to the media gateway and data traffic to the SGSN. HLR Home Location Register The HLR is a central database that contains details of each mobile subscriber that is authorised to use the GSM core network. Each IMSI/MSISDN can be associated with only 1 HLR at a time. It also stores data such as GSM services that the subscriber has requested, GPRS settings for access to packet services, subscriber location, and call divert settings. PDP context Packet Data Protocol The PDP context is a data structure present on the SGSN and the GGSN containing subscriber information for an active session. When a user wants to use GPRS, it must first activate a PDP context. The Context includes data such as: IP address, IMSI, Tunnel endpoint ID at the GGSN/SGSN. IPv6 in Mobile Networks Sunny Yeung 02/2014 6

7 CURRENT WIRELESS ARCHITECTURES IPv6 in Mobile Networks Sunny Yeung 02/2014 7

8 CURRENT IPV4 IMPLEMENTATION CENTRALISED CGNAT - National non-overlapping Private Address space used for UE assignment. Large service numbers will mean high Private Address demand. - CGNAT performs NAT/PAT 44. PAT substantially reduces Public and Private IPv4 address demand, but does not prevent run out. IPv6 in Mobile Networks Sunny Yeung 02/2014 8

9 IPV6 IN WIRELESS ARCHITECTURES IPv6 in Mobile Networks Sunny Yeung 02/2014 9

10 BEARER TYPES IPv4 Only Bearer The link is IPv4 only 1x private IPv4 address allocated by the GGSN via PDP context request. IPv6 Only Bearer The link is IPv6 only 1x /64 prefix per bearer, and 1x IPv6 address on UE IPv4v6 Bearer The link is dual-stack. The bearer is configured with both an IPv4 address and 1x /64 prefix. Dual Stack Implications 3GPP Release 8 : An IPv4 only + IPv6 only bearer is used, resulting in 2x bearers = significant licensing costs to the carrier. 3GPP Release 9 : A single PDP context/bearer IPv4v6 is used as standard. Only 1 interface is used on the GGSN/PGW. O Dual Stack 3GPP Release 8 Radio Bearer PDP Context IPv4 Radio Bearer PDP Context P Dual Stack 3GPP Release 9 Radio Bearer PDP Context IPv4 IPv6 IPv6 IPv6 in Mobile Networks Sunny Yeung 02/

11 WIRELESS INTERNET ACCESS BASIC IPV6 REQUIREMENTS - Dual-Stack / Native IPv6 UE - Backhaul IPv6 optional - SGSN IPv6 PDP aware - HLR Full IPv6 support - Radius AAA Full IPv6 support - DNS Full IPv6 support + DNS64 - GGSN Full IPv6 support - MPLS Core 6PE/6VPE - Large Scale NAT NAT44 and NAT64 IPv6 in Mobile Networks Sunny Yeung 02/

12 TRANSITION METHODS IPv6 in Mobile Networks Sunny Yeung 02/

13 TRANSITION METHOD 1 ENABLE IPV6 DUAL-STACK - Our self-imposed requirement is to run a single PDP context / bearer Dual-Stack implementation to reduce licensing costs if this is the way forward - Network Core is enabled with Dual-Stack regardless - Challenges with Dual-Stack: It does not resolve any Private IPv4 runout problem! Requires IPv4v6 PDP context support on all network elements Possible OS behaviour uncertain (preferences, stack selection) RFC6555? Operational overhead Limited available Handsets we are aware of that supports IPv4v6 single PDP. Still requires IPv4 connectivity provisioning IPv6 in Mobile Networks Sunny Yeung 02/

14 TRANSITION METHOD 2 ENABLING IPV6 SINGLE STACK - Preferred method when there is a risk of Private IPv4 runout - IPv4 used as backup in cases where IPv6 service is not available (eg. Roaming) - Stateful NAT64 to replace NAT44 for IPv4 destined traffic. - Network Core is enabled with Dual-Stack regardless. - Challenges Fragmentation and packet sizes due to NAT64 DNS resolution issues (local and/or remote) UE requires 464XLAT or similar due to many IPv4 only applications still out there. Requires UEs to support 464XLAT IPv6 in Mobile Networks Sunny Yeung 02/

15 WHICH METHOD? SINGLE STACK + NAT64 - UE for Single Stack with NAT64 is available, but many network / application issues need to be resolved. IPv4 literals do not work and requires re-work from developers XLAT need to be accepted as standard on the UE to accommodate for IPv4 only applications. This is now standard on Android Single Stack relies heavily on NAT64 for the initial few years of transition and many applications require ALGs. These may not be fully supported by vendors. - DNS issues - Fragmentation problems due to increased packet size. - Translation required to access self-hosted content but issues around header enrichment services must be addressed due to the translation and how radius is applied. DUAL-STACK with IPv4v6 - UE for Dual-Stack single PDP context / bearer are rare. - Issues around which stack it selects on the OS of the UE - Does not help with relieving Private IPv4 address runout problems - Suits well for providers with a lot of self-hosted content that cannot be changed to IPv6 quickly IPv6 in Mobile Networks Sunny Yeung 02/

16 SETUP AND TESTING IPv6 in Mobile Networks Sunny Yeung 02/

17 SETUP AND TESTING A common configuration can be deployed across all APNs with the following context types. This will provide the maximum flexibility on establishing a successful connection to the network. HLR = IPV4, IPV6+DS HSS = IPv4v6 MMS/SGSN = DAF set PGW/GGSN = IPv4v6 NAT64 (RFC6146) + DNS64 (RFC6147) MUST be used within each APN. 464XLAT (RFC6877) MUST be used for smartphones and handsets and establish a PDP context of type v6 only. IPv6 in Mobile Networks Sunny Yeung 02/

18 SETUP AND TESTING IPv6 was tested using single stack again in 2013 after the release of 464XLAT code from Samsung on the Galaxy S4 device using test software. Dongles may forego 464XLAT only if establishing a Dual-Stack PDP type of IPv4v6 only. In the future when dongles are set with IPv6 only, it MUST support 464XLAT. Devices tested so far: - Samsung Note 3 (Android 4.3) - Samsung Galaxy S4 (Android 4.3) - Samsung Note (Android 4.3) IPv6 in Mobile Networks Sunny Yeung 02/

19 CONFIGURATIONS AND SETTINGS IPv6 in Mobile Networks Sunny Yeung 02/

20 CONFIGURATIONS AND SETTINGS ROUTERS AND SWITCHES Don t believe everything your vendor says about IPv6 support Running OSPF? IPv6 needs OSPFv3. Using it with VRF-Lite? Make sure it runs 15.1SY or above on Cisco Routers. For Cisco devices, convert your access-layer and others to use HSRPv2. Not all devices have IPv6 unicast routing enabled by default! Remember to enable multi-layer switching Cisco (config) # ipv6 unicast-routing Cisco (config) # mls ipv6 vrf Cisco (config) # vrf definition Payload Cisco (config-vrf) # address family ipv4 Cisco (config-vrf) # address family ipv6 IPv6 in Mobile Networks Sunny Yeung 02/

21 CONFIGURATIONS AND SETTINGS ROUTERS AND SWITCHES Juniper Routers don t necessarily advertise IPv6 directly connected routes by itself you need to tell it what to do! user@host# set interfaces xe-1/0/0 unit 10 family inet6 address 2001:2000:D:200::2/64 user@host# set protocols router-advertisement interface xe-1/0/0.10 prefix 2001:2000:D:200::/64 For static routes, its even weirder: IPv4 static route: user@host# set routing-instances IPv6Test routing-options static route /28 next-hop IPv6 static route: user@host# set routing-instances IPv6Test routing-options rib IPv6Test.inet6.0 static route 2001:2000:C:200::/64 next-hop 2001:2000:D:200::4 IPv6 in Mobile Networks Sunny Yeung 02/

22 SOLUTION TESTING AND RESULTS IPv6 in Mobile Networks Sunny Yeung 02/

23 464XLAT TESTING INDICATIVE RESULTS FROM 2013 TRIAL Most applications working reasonably well. IPsec/VPN applications require more testing Some IPv4-only applications now working better with 464XLAT Some applications still experiencing issues we are still investigating why even though 464XLAT is implemented. Please talk to me separately if you are interested. IPv6 in Mobile Networks Sunny Yeung 02/

24 CONSIDERATIONS FOR THE FUTURE IPv6 in Mobile Networks Sunny Yeung 02/

25 CONSIDERATIONS FOR THE FUTURE Most networks usually use Dual-Stack first, but NAT44 networks with private address constraints, like many mobile networks, may benefit going directly to Single-Stack IPv6. Be careful when defining what Single-Stack and Dual-Stack is for Mobiles Dual-Stack is deployed in the Mobile IP Core for the foreseeable future! Single Stack is highly recommended for the PDP session! You can begin deploying IPv6 today in the Core! Check with your vendor to ensure the features needed are supported. Begin today, don t delay! The chicken or the egg first scenario no longer applies! Networks with IPv4v6 PDP enabled should not have DNS64 enabled simultaneously. Networks with IPv6 PDP only enabled must have DNS64 enabled. Begin looking at enabling your content to support native IPv6 CGN may be required to extend the IPv4 runout. Don t be afraid to use it but don t be over-reliant on it the end goal is always native IPv6. CGN will not prevent the inevitable! IPv6 in Mobile Networks Sunny Yeung 02/

26 CONSIDERATIONS FOR THE FUTURE Devices on Single Stack IPv6 must support 464XLAT until all applications have native IPv6 support and IPv4 literals disappear from the internet. Push your device Vendors to support 464XLAT as a standard release Push for devices that support IPv6 and IPv4v6 Make sure you include RFC6555 (Happy Eyeballs) as a requirement for DS devices We need all Mobile operators to support 3GPP R8 and above so the transition to support IPv6 international roaming is simplified in the future. If everyone can get to R8+, then we can do IPv6 international roaming! For the immediate next 2-3 years, devices when roaming should default back to IPv4. (debatable!). IPv6 in Mobile Networks Sunny Yeung 02/

27 MORE INFORMATION CGN considerations APNIC Plenary: Anatomy of CGN Ballroom B, Wednesday 26/02/2014, 9am to 10:30am Pressure caused by IPv4 address exhaustion is increasing and real. Some Service Providers need to deploy IPv6 transition technologies while extending their IPv4 address space by relying more on private addresses. Carrier Grade NAT (CGN) has been discussed as an option to extend globally routable IPv4 addresses since Various arguments have been put forward about its pros and cons. What is 464XLAT? 464XLAT: Breaking Free of IPv4 Lotus 5&6, Tuesday 25/02/2014, 4pm to 5:30pm Presented by Cameron Byrne from T-Mobile, this tutorial will review 464XLAT (RFC6877) and how it applies to mobile and broadband networks to enable growth beyond IPv4 scale while minimizing translation and tunnelling and positively incentivizing end-to-end IPv6 deployment. IPv6 in Mobile Networks Sunny Yeung 02/

28 QUESTIONS? IPv6 in Mobile Networks Sunny Yeung 02/

29 CONTACT Sunny Yeung Senior Technology Specialist Telstra Wireless Data Engineering IPv6 in Mobile Networks Sunny Yeung 02/